Search This Blog

Saturday, October 14, 2023

Benedict Arnold

From Wikipedia, the free encyclopedia
Benedict Arnold
Portrait by Thomas Hart, 1776
BornJanuary 14, 1741
Norwich, Connecticut
DiedJune 14, 1801 (aged 60)
London, England
Buried 51°28′36″N 0°10′32″W
Allegiance
Service/branch
Years of service
  • 1760, 1775 (colonial forces)
  • 1775–1780 (Continental Army)
  • 1780–1781 (British Army)
Rank
Commands held
Battles/wars
MemorialsBoot Monument
Spouse(s)
  • Margaret Mansfield
    (m. 1767; died 1775)
  • (m. 1779)
Children8
Relations
Other workApothecary, merchant
Signature
Dedication plaque on Groton Monument in Groton, Connecticut to victims of Arnold's slaughter following the Battle of Groton Heights:

This monument was erected under the patronage of the State of Connecticut in the 55th year of the Independence of the U.S.A. in memory of the brave patriots massacred at Fort Griswold near this spot on the 6th of Sept. AD 1781, when the British, under the command of the Traitor Benedict Arnold, burnt the towns of New London and Groton and spread desolation and woe throughout the region.

Benedict Arnold (14 January 1741 [O.S. 3 January 1740] – June 14, 1801) was an American-born military officer who served during the American Revolutionary War. He fought with distinction for the American Continental Army and rose to the rank of major general before defecting to the British in 1780. General George Washington had given him his fullest trust and had placed him in command of West Point in New York. Arnold was planning to surrender the fort to British forces, but the plot was discovered in September 1780, whereupon he fled to the British lines. In the later part of the war, Arnold was commissioned as a brigadier general in the British Army and placed in command of the American Legion. He led the British army in battle against the soldiers whom he had once commanded, after which his name became synonymous with treason and betrayal in the United States.

Arnold was born in Connecticut. He was a merchant operating ships in the Atlantic when the war began. He joined the growing American army outside of Boston and distinguished himself by acts that demonstrated intelligence and bravery: In 1775, he captured Fort Ticonderoga. In 1776, he deployed defensive and delay tactics at the Battle of Valcour Island in Lake Champlain that gave American forces time to prepare New York's defenses. His performance in the Battle of Ridgefield in Connecticut prompted his promotion to major general. He performed operations that provided the Americans with relief during the siege of Fort Stanwix, and key actions during the pivotal 1777 Battles of Saratoga in which he sustained leg injuries that put him out of combat for several years.

Arnold repeatedly claimed that he was being passed over for promotion by the Continental Congress, and that other officers were being given credit for some of his accomplishments. Some in his military and political circles charged him with corruption and other bad acts. After formal inquiries, he was usually acquitted, but Congress investigated his finances and determined that he was indebted to Congress and that he had borrowed money heavily to maintain a lavish lifestyle.

Arnold mingled with Loyalist sympathizers in Philadelphia and married into the Loyalist family of Peggy Shippen. She was a close friend of British Major John André and kept in contact with him when he became head of the British espionage system in New York. Many historians see her as having facilitated Arnold's plans to switch sides; he opened secret negotiations with André, and she relayed their messages to each other. The British promised £20,000 for the capture of West Point, a major American stronghold. Washington greatly admired Arnold and gave him command of that fort in July 1780. His scheme was to surrender the fort to the British, but it was exposed in September 1780 when American militiamen captured André carrying papers which revealed the plot. Arnold escaped; André was hanged.

Arnold received a commission as a brigadier general in the British Army, an annual pension of £360, and a lump sum of over £6,000.[b][6] He led British forces in the Raid on Richmond and nearby areas, and they burned much of New London, Connecticut to the ground and slaughtered surrendering forces after the Battle of Groton Heights—just a few miles downriver from the town where he had grown up. In the winter of 1782, he and Peggy moved to London, England. He was well received by King George III and the Tories but frowned upon by the Whigs and most Army officers. In 1787, he moved to Canada to run a merchant business with his sons Richard and Henry. He was extremely unpopular there and returned to London permanently in 1791, where he died ten years later.

Early life

Benedict Arnold was born a British subject, the second of six children of his father Benedict Arnold III (1683–1761) and Hannah Waterman King in Norwich, Connecticut, on January 14, 1741. Arnold was the fourth surviving member of his family named after his great-grandfather Benedict Arnold I, an early governor of the Colony of Rhode Island; his grandfather (Benedict Arnold II) and father, as well as an older brother who died in infancy, were also named for the colonial governor. Only he and his sister Hannah survived to adulthood; his other siblings died from yellow fever in childhood. His siblings were, in order of birth: Benedict (1738–1739), Hannah (1742–1803), Mary (1745–1753), Absolom (1747–1750), and Elizabeth (1749–1755). Through his maternal grandmother, Arnold was a descendant of John Lothropp, an ancestor of six presidents.

Arnold's father was a successful businessman, and the family moved in the upper levels of Norwich society. He was enrolled in a private school in nearby Canterbury, Connecticut, when he was 10, with the expectation that he would eventually attend Yale College. However, the deaths of his siblings two years later may have contributed to a decline in the family fortunes, since his father took up drinking. By the time that he was 14, there was no money for private education. His father's alcoholism and ill health kept him from training Arnold in the family mercantile business, but his mother's family connections secured an apprenticeship for him with her cousins Daniel and Joshua Lathrop, who operated a successful apothecary and general merchandise trade in Norwich. His apprenticeship with the Lathrops lasted seven years.

Arnold was very close to his mother, who died in 1759. His father's alcoholism worsened after her death, and the youth took on the responsibility of supporting his father and younger sister. His father was arrested on several occasions for public drunkenness, was refused communion by his church, and died in 1761.

French and Indian War

In 1755, Arnold was attracted by the sound of a drummer and attempted to enlist in the provincial militia for service in the French and Indian War, but his mother refused permission. In 1757 when he was 16, he did enlist in the Connecticut militia, which marched off toward Albany, New York, and Lake George. The French had besieged Fort William Henry in northeastern New York, and their Indian allies had committed atrocities after their victory. Word of the siege's disastrous outcome led the company to turn around, and Arnold served for only 13 days. A commonly accepted story that he deserted from militia service in 1758 is based on uncertain documentary evidence.

Colonial merchant

Arnold established himself in business in 1762 as a pharmacist and bookseller in New Haven, Connecticut, with the help of the Lathrops. He was hardworking and successful, and was able to rapidly expand his business. In 1763, he repaid money that he had borrowed from the Lathrops, repurchased the family homestead that his father had sold when deeply in debt, and re-sold it a year later for a substantial profit. In 1764, he formed a partnership with Adam Babcock, another young New Haven merchant. They bought three trading ships, using the profits from the sale of his homestead, and established a lucrative West Indies trade.

During this time, Arnold brought his sister Hannah to New Haven and established her in his apothecary to manage the business in his absence. He traveled extensively in the course of his business throughout New England and from Quebec to the West Indies, often in command of one of his own ships. Some sources recount how, on one of his voyages, he fought a duel in Honduras with a British sea captain who had called him a "damned Yankee, destitute of good manners or those of a gentleman". The captain was wounded in the first exchange of gunfire, and he apologized when Arnold threatened to aim to kill on the second. However, it is unknown whether this encounter actually happened or not.

A procession of men, depicting various members of the British Parliament at the time, accompany then-Prime Minister Grenville as he carries a small coffin representing the Stamp Act near a waterfront scene with a sailing ship, cranes, bales of goods, and wharf warehouses in the background
A 1766 political cartoon on the repeal of the Stamp Act

The Sugar Act of 1764 and the Stamp Act of 1765 severely curtailed mercantile trade in the colonies. The Stamp Act prompted Arnold to join the chorus of voices in opposition, and also led to his joining the Sons of Liberty, a secret organization which advocated resistance to those and other restrictive Parliamentary measures. Arnold initially took no part in any public demonstrations but, like many merchants, continued to do business openly in defiance of the Parliamentary Acts, which legally amounted to smuggling. He also faced financial ruin, falling £16,000 in debt with creditors spreading rumors of his insolvency, to the point where he took legal action against them. On the night of January 28, 1767, he and members of his crew roughed up a man suspected of attempting to inform authorities of Arnold's smuggling. He was convicted of disorderly conduct and fined the relatively small amount of 50 shillings; publicity of the case and widespread sympathy for his views probably contributed to the light sentence.

On February 22, 1767, Arnold married Margaret Mansfield, daughter of Samuel Mansfield, the sheriff of New Haven and a fellow member in the local Masonic Lodge. Their son Benedict was born the following year and was followed by brothers Richard in 1769 and Henry in 1772. Margaret died on June 19, 1775, while Arnold was at Fort Ticonderoga following its capture. She is buried in the crypt of the Center Church on New Haven Green. The household was dominated by Arnold's sister Hannah, even while Margaret was alive. Arnold benefited from his relationship with Mansfield, who became a partner in his business and used his position as sheriff to shield him from creditors.

Arnold was in the West Indies when the Boston Massacre took place on March 5, 1770. He wrote that he was "very much shocked" and wondered "good God, are the Americans all asleep and tamely giving up their liberties, or are they all turned philosophers, that they don't take immediate vengeance on such miscreants?"

Revolutionary War (American service)

Siege of Boston and Fort Ticonderoga

Arnold began the war as a captain in the Connecticut militia, a position to which he was elected in March 1775. His company marched northeast the following month to assist in the siege of Boston that followed the Battles of Lexington and Concord. He proposed an action to the Massachusetts Committee of Safety to seize Fort Ticonderoga in upstate New York, which he knew was poorly defended. They issued him a colonel's commission on May 3, 1775, and he immediately rode off to Castleton in the disputed New Hampshire Grants (Vermont) in time to participate with Ethan Allen and his men in the capture of Fort Ticonderoga. He followed up that action with a bold raid on Fort Saint-Jean on the Richelieu River north of Lake Champlain. A Connecticut militia force arrived at Ticonderoga in June; Arnold had a dispute with its commander over control of the fort, and resigned his Massachusetts commission. He was on his way home from Ticonderoga when he learned that his wife had died earlier in June.

A half-height oil portrait of Carleton. He faces front, wearing a red coat and vest over a ruffled white shirt. His hair is white, and is apparently pulled back.
Quebec Governor Guy Carleton opposed Arnold at Quebec and Valcour Island.

Quebec expedition

The Second Continental Congress authorized an invasion of Quebec, in part on the urging of Arnold—but he was passed over for command of the expedition. He then went to Cambridge, Massachusetts, and suggested to George Washington a second expedition to attack Quebec City via a wilderness route through Maine. He received a colonel's commission in the Continental Army for this expedition and left Cambridge in September 1775 with 1,100 men. He arrived before Quebec City in November, after a difficult passage in which 300 men turned back and another 200 died en route. He and his men were joined by Richard Montgomery's small army and participated in the December 31 assault on Quebec City in which Montgomery was killed and Arnold's leg was shattered. His chaplain Rev. Samuel Spring carried him to the makeshift hospital at the Hôtel Dieu. Arnold was promoted to brigadier general for his role in reaching Quebec, and he maintained an ineffectual siege of the city until he was replaced by Major General David Wooster in April 1776.

Arnold then traveled to Montreal where he served as military commander of the city until forced to retreat by an advancing British army that had arrived at Quebec in May. He presided over the rear of the Continental Army during its retreat from Saint-Jean, where he was reported by James Wilkinson to be the last person to leave before the British arrived. He then directed the construction of a fleet to defend Lake Champlain, which was overmatched and defeated in the October 1776 Battle of Valcour Island. However, his actions at Saint-Jean and Valcour Island played a notable role in delaying the British advance against Ticonderoga until 1777.

During these actions, Arnold made a number of friends and a larger number of enemies within the army power structure and in Congress. He had established a decent relationship with George Washington, as well as Philip Schuyler and Horatio Gates, both of whom had command of the army's Northern Department during 1775 and 1776. However, an acrimonious dispute with Moses Hazen, commander of the 2nd Canadian Regiment, boiled into Hazen's court martial at Ticonderoga during the summer of 1776. Only action by Arnold's superior at Ticonderoga prevented his own arrest on countercharges leveled by Hazen. He also had disagreements with John Brown and James Easton, two lower-level officers with political connections that resulted in ongoing suggestions of improprieties on his part. Brown was particularly vicious, publishing a handbill which claimed of Arnold, "Money is this man's God, and to get enough of it he would sacrifice his country".

Rhode Island and Philadelphia

A three-quarters length oil portrait of Gates against a neutral dark background. He is wearing a general's uniform, blue jacket with gold facing and gold epaulets. He is holding a sword in one hand and a paper in the other. His hair is white and has been tied back.
Major General Horatio Gates led the forces at Saratoga; portrait by Gilbert Stuart, 1793–94.

General Washington assigned Arnold to the defense of Rhode Island following the British seizure of Newport in December 1776, where the militia were too poorly equipped to even consider an attack on the British. He took the opportunity to visit his children while near his home in New Haven, and he spent much of the winter socializing in Boston, where he unsuccessfully courted a young belle named Betsy Deblois. In February 1777, he learned that he had been passed over by Congress for promotion to major general. Washington refused his offer to resign, and wrote to members of Congress in an attempt to correct this, noting that "two or three other very good officers" might be lost if they persisted in making politically motivated promotions.

Arnold was on his way to Philadelphia to discuss his future when he was alerted that a British force was marching toward a supply depot in Danbury, Connecticut. He organized the militia response, along with David Wooster and Connecticut militia General Gold Selleck Silliman. He led a small contingent of militia attempting to stop or slow the British return to the coast in the Battle of Ridgefield, and was again wounded in his left leg.

He then continued on to Philadelphia, where he met with members of Congress about his rank. His action at Ridgefield, coupled with the death of Wooster due to wounds sustained in the action, resulted in his promotion to major general, although his seniority was not restored over those who had been promoted before him. Amid negotiations over that issue, Arnold wrote out a letter of resignation on July 11, the same day that word arrived in Philadelphia that Fort Ticonderoga had fallen to the British. Washington refused his resignation and ordered him north to assist with the defense there.

Saratoga campaign

Arnold arrived in Schuyler's camp at Fort Edward, New York, on July 24. On August 13, Schuyler dispatched him with a force of 900 to relieve the siege of Fort Stanwix, where he succeeded in a ruse to lift the siege. He sent an Indian messenger into the camp of British Brigadier General Barry St. Leger with news that the approaching force was much larger and closer than it actually was; this convinced St. Leger's Indian allies to abandon him, forcing him to give up the effort.

Arnold returned to the Hudson where General Gates had taken over command of the American army, which had retreated to a camp south of Stillwater. He then distinguished himself in both Battles of Saratoga, even though General Gates removed him from field command after the first battle, following a series of escalating disagreements and disputes that culminated in a shouting match. During the fighting in the second battle, Arnold disobeyed Gates' orders and took to the battlefield to lead attacks on the British defenses. He was again severely wounded in the left leg late in the fighting. Arnold said that it would have been better had it been in the chest instead of the leg. Burgoyne surrendered ten days after the second battle on October 17, 1777. Congress restored Arnold's command seniority in response to his valor at Saratoga. However, he interpreted the manner in which they did so as an act of sympathy for his wounds, and not an apology or recognition that they were righting a wrong.

Arnold's Oath of Allegiance, May 30, 1778

Arnold spent several months recovering from his injuries. He had his leg crudely set, rather than allowing it to be amputated, leaving it 2 inches (5 cm) shorter than the right. He returned to the army at Valley Forge, Pennsylvania, in May 1778 to the applause of men who had served under him at Saratoga. There he participated in the first recorded Oath of Allegiance, along with many other soldiers, as a sign of loyalty to the United States.

Residence in Philadelphia

The British withdrew from Philadelphia in June 1778, and Washington appointed Arnold military commander of the city. Historian John Shy states:

Washington then made one of the worst decisions of his career, appointing Arnold as military governor of the rich, politically divided city. No one could have been less qualified for the position. Arnold had amply demonstrated his tendency to become embroiled in disputes, as well as his lack of political sense. Above all, he needed tact, patience, and fairness in dealing with a people deeply marked by months of enemy occupation.

Arnold began planning to capitalize financially on the change in power in Philadelphia, even before the Americans reoccupied their city. He engaged in a variety of business deals designed to profit from war-related supply movements and benefiting from the protection of his authority. Such schemes were not uncommon among American officers, but Arnold's schemes were sometimes frustrated by powerful local politicians such as Joseph Reed, who eventually amassed enough evidence to publicly air charges against him. Arnold demanded a court martial to clear the charges, writing to Washington in May 1779: "Having become a cripple in the service of my country, I little expected to meet ungrateful returns".

President's House in Philadelphia, where Arnold made his headquarters while he was military commander of Philadelphia; it served as the presidential mansion of George Washington and John Adams from 1790 to 1800.

Arnold lived extravagantly in Philadelphia and was a prominent figure on the social scene. During the summer of 1778, he met Peggy Shippen, the 18-year-old daughter of Judge Edward Shippen (III), a Loyalist sympathizer who had done business with the British while they occupied the city; Peggy had been courted by British Major John André during the British occupation of Philadelphia. She married Arnold on April 8, 1779. Shippen and her circle of friends had found methods of staying in contact with paramours across the battle lines, despite military bans on communication with the enemy. Some of this communication was effected through the services of Joseph Stansbury, a Philadelphia merchant.

Plotting to change sides

Historians have identified many possible factors contributing to Arnold's treason, while some debate their relative importance. According to W. D. Wetherell, he was:

[A]mong the hardest human beings to understand in American history. Did he become a traitor because of all the injustice he suffered, real and imagined, at the hands of the Continental Congress and his jealous fellow generals? Because of the constant agony of two battlefield wounds in an already gout-ridden leg? From psychological wounds received in his Connecticut childhood when his alcoholic father squandered the family's fortunes? Or was it a kind of extreme midlife crisis, swerving from radical political beliefs to reactionary ones, a change accelerated by his marriage to the very young, very pretty, very Tory Peggy Shippen?

Wetherell says that the shortest explanation for his treason is that he "married the wrong person".

Lieutenant General Henry Clinton

Arnold had been badly wounded twice in battle and had lost his business in Connecticut, which made him profoundly bitter. He grew resentful of several rival and younger generals who had been promoted ahead of him and given honors which he thought he deserved. Especially galling was a long feud with the civil authorities in Philadelphia which led to his court-martial. He was also convicted of two minor charges of using his authority to make a profit. General Washington gave him a light reprimand, but it merely heightened Arnold's sense of betrayal; nonetheless, he had already opened negotiations with the British before his court martial even began. He later said in his own defense that he was loyal to his true beliefs, yet he lied at the same time by insisting that Peggy was totally innocent and ignorant of his plans.

Arnold had an extremely ambitious and jealous personality. He knew that he was distrusted and disliked by senior military officers on both sides. Washington was one of the few who genuinely liked and admired him, but Arnold thought that Washington had betrayed him.

As early as 1778, there were signs that Arnold was unhappy with his situation and pessimistic about the country's future. On November 10, 1778, Major General Nathanael Greene wrote to Brigadier General John Cadwalader, "I am told General Arnold is become very unpopular among you oweing to his associateing too much with the Tories." A few days later, Arnold wrote to Greene and lamented over the "deplorable" and "horrid" situation of the country at that particular moment, citing the depreciating currency, disaffection of the army, and internal fighting in Congress, while predicting "impending ruin" if things did not change soon. Biographer Nathaniel Philbrick argues:

Peggy Shippen… did have a significant role in the plot. She exerted powerful influence on her husband, who is said to have been his own man but who actually was swayed by his staff and certainly by his wife. Peggy came from a loyalist family in Philadelphia; she had many ties to the British. She… was the conduit for information to the British.

Early in May 1779, Arnold met with Philadelphia merchant Joseph Stansbury who then "went secretly to New York with a tender of [Arnold's] services to Sir Henry Clinton". Stansbury ignored instructions from Arnold to involve no one else in the plot, and he crossed the British lines and went to see Jonathan Odell in New York. Odell was a Loyalist working with William Franklin, the last colonial governor of New Jersey and the son of Benjamin Franklin. On May 9, Franklin introduced Stansbury to Major André, who had just been named the British spy chief. This was the beginning of a secret correspondence between Arnold and André, sometimes using his wife Peggy as a willing intermediary, which culminated more than a year later with Arnold's change of sides.

Secret communications

One of Arnold's coded letters. Cipher lines by Arnold are interspersed with lines by his wife, Peggy.

André conferred with Clinton, who gave him broad authority to pursue Arnold's offer. André then drafted instructions to Stansbury and Arnold. This initial letter opened a discussion on the types of assistance and intelligence that Arnold might provide, and included instructions for how to communicate in the future. Letters were to be passed through the women's circle that Peggy Arnold was a part of, but only Peggy would be aware that some letters contained instructions that were to be passed on to André, written in both code and invisible ink, using Stansbury as the courier.

By July 1779, Arnold was providing the British with troop locations and strengths, as well as the locations of supply depots, all the while negotiating over compensation. At first, he asked for indemnification of his losses and £10,000, an amount that the Continental Congress had given Charles Lee for his services in the Continental Army. Clinton was pursuing a campaign to gain control of the Hudson River Valley, and was interested in plans and information on the defenses of West Point and other defenses on the Hudson River. He also began to insist on a face-to-face meeting, and suggested to Arnold that he pursue another high-level command. By October 1779, the negotiations had ground to a halt. Furthermore, revolutionary mobs were scouring Philadelphia for Loyalists, and Arnold and the Shippen family were being threatened. Arnold was rebuffed by Congress and by local authorities in requests for security details for himself and his in-laws.

Court martial

The Norris Tavern, in Morristown, New Jersey, where the trial took place

Arnold's court martial on charges of profiteering began meeting on June 1, 1779, but it was delayed until December 1779 by Clinton's capture of Stony Point, New York, throwing the army into a flurry of activity to react. Several members on the panel of judges were ill-disposed toward Arnold over actions and disputes earlier in the war, yet Arnold was cleared of all but two minor charges on January 26, 1780. Arnold worked over the next few months to publicize this fact; however, Washington published a formal rebuke of his behavior in early April, just one week after he had congratulated Arnold on the birth of his son Edward Shippen Arnold on March 19:

The Commander-in-Chief would have been much happier in an occasion of bestowing commendations on an officer who had rendered such distinguished services to his country as Major General Arnold; but in the present case, a sense of duty and a regard to candor oblige him to declare that he considers his conduct [in the convicted actions] as imprudent and improper.

A black and white full length portrait of André. He wears a uniform, dark jacket over white pants and shirt, with dark boots, and a three-cornered hat. His right hand holds a sword upright by his side, and his left arm is extending, pointing forward.
Major John André was Lieutenant General Henry Clinton's spy chief; he was captured and hanged for his role in the plot.

Shortly after Washington's rebuke, a Congressional inquiry into Arnold's expenditures concluded that he had failed to account fully for his expenditures incurred during the Quebec invasion, and that he owed the Congress some £1,000, largely because he was unable to document them. Many of these documents had been lost during the retreat from Quebec. Angry and frustrated, Arnold resigned his military command of Philadelphia in late April.

Offer to surrender West Point

Early in April, Philip Schuyler had approached Arnold with the possibility of giving him the command at West Point. Discussions had not borne fruit between Schuyler and Washington by early June. Arnold reopened the secret channels with the British, informing them of Schuyler's proposals and including Schuyler's assessment of conditions at West Point. He also provided information on a proposed French-American invasion of Quebec that was to go up the Connecticut River (Arnold did not know that this proposed invasion was a ruse intended to divert British resources). On June 16, Arnold inspected West Point while on his way home to Connecticut to take care of personal business, and he sent a highly detailed report through the secret channel. When he reached Connecticut, Arnold arranged to sell his home there and began transferring assets to London through intermediaries in New York. By early July, he was back in Philadelphia, where he wrote another secret message to Clinton on July 7 which implied that his appointment to West Point was assured and that he might even provide a "drawing of the works ... by which you might take [West Point] without loss".

André returned victorious from the siege of Charleston on June 18, and both he and Clinton were immediately caught up in this news. Clinton was concerned that Washington's army and the French fleet would join in Rhode Island, and he again fixed on West Point as a strategic point to capture. André had spies and informers keeping track of Arnold to verify his movements. Excited by the prospects, Clinton informed his superiors of his intelligence coup, but failed to respond to Arnold's July 7 letter.

Arnold next wrote a series of letters to Clinton, even before he might have expected a response to the July 7 letter. In a July 11 letter, he complained that the British did not appear to trust him, and threatened to break off negotiations unless progress was made. On July 12, he wrote again, making explicit the offer to surrender West Point, although his price rose to £20,000 (in addition to indemnification for his losses), with a £1,000 down payment to be delivered with the response. These letters were delivered by Samuel Wallis, another Philadelphia businessman who spied for the British, rather than by Stansbury.

Command at West Point

Colonel Beverley Robinson's house, Arnold's headquarters at West Point

On August 3, 1780, Arnold obtained command of West Point. On August 15, he received a coded letter from André with Clinton's final offer: £20,000 and no indemnification for his losses. Neither side knew for some days that the other was in agreement with that offer, due to difficulties in getting the messages across the lines. Arnold's letters continued to detail Washington's troop movements and provide information about French reinforcements that were being organized. On August 25, Peggy finally delivered to him Clinton's agreement to the terms.

Arnold's command at West Point also gave him authority over the entire American-controlled Hudson River, from Albany down to the British lines outside New York City. While en route to West Point, Arnold renewed an acquaintance with Joshua Hett Smith, who had spied for both sides and who owned a house near the western bank of the Hudson about 15 miles south of West Point.

Once Arnold established himself at West Point, he began systematically weakening its defenses and military strength. Needed repairs of the chain across the Hudson were never ordered. Troops were liberally distributed within Arnold's command area (but only minimally at West Point itself) or furnished to Washington on request. He also peppered Washington with complaints about the lack of supplies, writing, "Everything is wanting." At the same time, he tried to drain West Point's supplies so that a siege would be more likely to succeed. His subordinates, some long-time associates, grumbled about Arnold's unnecessary distribution of supplies and eventually concluded that he was selling them on the black market for personal gain.

A French map of West Point in 1780

On August 30, Arnold sent a letter accepting Clinton's terms and proposing a meeting to André through yet another intermediary: William Heron, a member of the Connecticut Assembly whom he thought he could trust. In an ironic twist, Heron went into New York unaware of the significance of the letter and offered his own services to the British as a spy. He then took the letter back to Connecticut, suspicious of Arnold's actions, where he delivered it to the head of the Connecticut militia. General Parsons laid it aside, seeing a letter written as a coded business discussion. Four days later, Arnold sent a ciphered letter with similar content into New York through the services of the wife of a prisoner of war. Eventually, a meeting was set for September 11 near Dobbs Ferry. This meeting was thwarted when British gunboats in the river fired on his boat, not being informed of his impending arrival.

Plot exposed

Arnold and André finally met on September 21 at the Joshua Hett Smith House. On the morning of September 22, from their position at Teller's Point, two American rebels (under the command of Colonel James Livingston), John "Jack" Peterson and Moses Sherwood, fired on HMS Vulture, the ship that was intended to carry André back to New York. This action did little damage besides giving the captain, Andrew Sutherland, a splinter in his nose—but the splinter prompted the Vulture to retreat, forcing André to return to New York overland. Arnold wrote out passes for André so that he would be able to pass through the lines, and he also gave him plans for West Point.

André was captured near Tarrytown, New York, on Saturday, September 23, by three Westchester militiamen. They found the papers exposing the plot to capture West Point and passed them on to their superiors, but André convinced the unsuspecting Colonel John Jameson, to whom he was delivered, to send him back to Arnold at West Point—but he never reached West Point. Major Benjamin Tallmadge was a member of the Continental Army's Culper Ring, a network of spies established under Washington's orders, and he insisted that Jameson order the prisoner to be intercepted and brought back. Jameson reluctantly recalled the lieutenant who had been delivering André into Arnold's custody, but he then sent the same lieutenant as a messenger to notify Arnold of André's arrest.

Arnold learned of André's capture the morning of September 24 while waiting for Washington, with whom he was going to have breakfast at his headquarters in British Colonel Beverley Robinson's former summer house on the east bank of the Hudson. Upon receiving Jameson's message, however, he learned that Jameson had sent Washington the papers which André was carrying. Arnold immediately hastened to the shore and ordered bargemen to row him downriver to where HMS Vulture was anchored, fleeing on it to New York City. From the ship, he wrote a letter to Washington requesting that Peggy be given safe passage to her family in Philadelphia—which Washington granted.

Washington remained calm when he was presented with evidence of Arnold's treason. He did, however, investigate its extent, and suggested that he was willing to exchange André for Arnold during negotiations with Clinton concerning André's fate. Clinton refused this suggestion; after a military tribunal, André was hanged at Tappan, New York, on October 2. Washington also infiltrated men into New York City in an attempt to capture Arnold. This plan very nearly succeeded, but Arnold changed living quarters prior to sailing for Virginia in December and thus avoided capture. He justified his actions in an open letter titled "To the Inhabitants of America", published in newspapers in October 1780. He also wrote in the letter to Washington requesting safe passage for Peggy: "Love to my country actuates my present conduct, however it may appear inconsistent to the world, who very seldom judge right of any man's actions."

Revolutionary War (British service)

Raids in Virginia and Connecticut colonies

The British gave Arnold a brigadier general's commission with an annual income of several hundred pounds, but they paid him only £6,315 plus an annual pension of £360 for his defection because his plot had failed. In December 1780, he led a force of 1,600 troops into Virginia under orders from Clinton, where he captured Richmond by surprise and then went on a rampage through Virginia, destroying supply houses, foundries, and mills. This activity brought out Virginia's militia led by Colonel Sampson Mathews, and Arnold eventually retreated to Portsmouth to be reinforced or to evacuate.

The pursuing American army included the Marquis de Lafayette, who was under orders from Washington to hang Arnold summarily if he was captured. British reinforcements arrived in late March led by Major General William Phillips who served under Lieutenant General John Burgoyne at Saratoga. Phillips led further raids across Virginia, including a defeat of Baron von Steuben at Petersburg, but he died of fever on May 12, 1781. Arnold commanded the army only until May 20, when Lieutenant General Charles Cornwallis arrived with the southern army and took over. One colonel wrote to Clinton concerning Arnold: "There are many officers who must wish some other general in command." Cornwallis ignored Arnold's advice to locate a permanent base away from the coast, advice that might have averted his surrender at Yorktown.

On his return to New York in June, Arnold made a variety of proposals for attacks on economic targets to force the Americans to end the war. Clinton was uninterested in most of his aggressive ideas, but finally authorized him to raid the port of New London, Connecticut. He led a force of more than 1,700 men which burned most of New London to the ground on September 4, causing damage estimated at $500,000. They also attacked and captured Fort Griswold across the river in Groton, Connecticut, slaughtering the Americans after they surrendered following the Battle of Groton Heights—and all these deeds were done just a few miles down the Thames River from Norwich, where Arnold grew up. However, British casualties were high; nearly one quarter of the force was killed or wounded, and Clinton declared that he could ill afford any more such victories.

British surrender and exile in England

Even before Cornwallis's surrender in October, Arnold had requested permission from Clinton to go to England to give Lord George Germain his thoughts on the war in person. He renewed that request when he learned of the surrender, which Clinton then granted. On December 8, 1781, Arnold and his family left New York for England.

In London, Arnold aligned himself with the Tories, advising Germain and King George III to renew the fight against the Americans. In the House of Commons, Edmund Burke expressed the hope that the government would not put Arnold "at the head of a part of a British army" lest "the sentiments of true honour, which every British officer [holds] dearer than life, should be afflicted". The anti-war Whigs had gained the upper hand in Parliament, and Germain was forced to resign, with the government of Lord North falling not long after.

Arnold then applied to accompany Lieutenant General Guy Carleton, who was going to New York to replace Clinton as commander-in-chief, but the request went nowhere. Other attempts all failed to gain positions within the government or the British East India Company over the next few years, and he was forced to subsist on the reduced pay of non-wartime service. His reputation also came under criticism in the British press, especially when compared to Major André who was celebrated for his patriotism. One critic said that he was a "mean mercenary, who, having adopted a cause for the sake of plunder, quits it when convicted of that charge". George Johnstone turned him down for a position in the East India Company and explained: "Although I am satisfied with the purity of your conduct, the generality do not think so. While this is the case, no power in this country could suddenly place you in the situation you aim at under the East India Company."

To Canada, then back to England

James Maitland, 8th Earl of Lauderdale, fought a duel with Arnold. Portrait by Thomas Gainsborough.

In 1785, Arnold and his son Richard moved to Saint John, New Brunswick, where they speculated in land and established a business doing trade with the West Indies. Arnold purchased large tracts of land in the Maugerville area, and acquired city lots in Saint John and Fredericton. Delivery of his first ship the Lord Sheffield was accompanied by accusations from the builder that Arnold had cheated him; Arnold replied that he had merely deducted the contractually agreed amount when the ship was delivered late. After her first voyage, Arnold returned to London in 1786 to bring his family to Saint John. While there, he disentangled himself from a lawsuit over an unpaid debt that Peggy had been fighting while he was away, paying £900 to settle a £12,000 loan that he had taken while living in Philadelphia. The family moved to Saint John in 1787, where Arnold created an uproar with a series of bad business deals and petty lawsuits. The most serious of these was a slander suit which he won against a former business partner; and following this, townspeople burned him in effigy in front of his house, as Peggy and the children watched. The family left Saint John to return to London in December 1791.

In July 1792, Arnold fought a bloodless duel with the Earl of Lauderdale after the Earl impugned his honor in the House of Lords. With the outbreak of the French Revolution, Arnold outfitted a privateer, while continuing to do business in the West Indies, even though the hostilities increased the risk. He was imprisoned by French authorities on Guadeloupe amid accusations of spying for the British, and narrowly eluded hanging by escaping to the blockading British fleet after bribing his guards. He helped organize militia forces on British-held islands, receiving praise from the landowners for his efforts on their behalf. He hoped that this work would earn him wider respect and a new command; instead, it earned him and his sons a land-grant of 15,000 acres (6,100 ha) in Upper Canada, near present-day Renfrew, Ontario.

Death and funeral

In January 1801, Arnold's health began to decline. He had suffered from gout since 1775, and the condition attacked his unwounded leg to the point where he was unable to go to sea. The other leg ached constantly, and he walked only with a cane. His physicians diagnosed him as having dropsy, and a visit to the countryside only temporarily improved his condition. He died after four days of delirium on June 14, 1801, at the age of 60. Legend has it that, when he was on his deathbed, he said, "Let me die in this old uniform in which I fought my battles. May God forgive me for ever having put on another," but this story may be apocryphal. Arnold was buried at St. Mary's Church in Battersea, England. As a result of a clerical error in the parish records, his remains were removed to an unmarked mass grave during church renovations a century later. His funeral procession boasted "seven mourning coaches and four state carriages"; the funeral was without military honors.

Arnold left a small estate, reduced in size by his debts, which Peggy undertook to clear. Among his bequests were considerable gifts to one John Sage, perhaps an illegitimate son or grandson.

Legacy

Benedict Arnold became permanently synonymous with "traitor" soon after his betrayal became public.

Biblical themes were often invoked. One 1794 textbook stated that "Satan entered into the heart of Benedict." Benjamin Franklin wrote that "Judas sold only one man, Arnold three millions", and Alexander Scammell described his actions as "black as hell". In Arnold's home town of Norwich, Connecticut, someone scrawled "the traitor" next to his record of birth at city hall, and all of his family's gravestones have been destroyed except his mother's.

Arnold was aware of his reputation in his home country, and French statesman Talleyrand described meeting him in Falmouth, Cornwall in 1794:

The innkeeper at whose place I had my meals informed me that one of his lodgers was an American general. Thereupon I expressed the desire of seeing that gentleman, and, shortly after, I was introduced to him. After the usual exchange of greetings … I ventured to request from him some letters of introduction to his friends in America. "No," he replied, and after a few moments of silence, noticing my surprise, he added, "I am perhaps the only American who cannot give you letters for his own country … all the relations I had there are now broken … I must never return to the States." He dared not tell me his name. It was General Arnold.

Talleyrand continued, "I must confess that I felt much pity for him, for which political puritans will perhaps blame me, but with which I do not reproach myself, for I witnessed his agony".

An 1865 political cartoon depicting Benedict Arnold and Jefferson Davis in hell

Early biographers attempted to describe Arnold's entire life in terms of treacherous or morally questionable behavior. The first major biography of his life was The Life and Treason of Benedict Arnold, published in 1832 by historian Jared Sparks; it was particularly harsh in showing how Arnold's treacherous character was formed out of childhood experiences. George Canning Hill authored a series of moralistic biographies in the mid-19th century and began his 1865 biography of Arnold: "Benedict, the Traitor, was born…". Social historian Brian Carso notes that, as the 19th century progressed, the story of Arnold's betrayal was portrayed with near-mythical proportions as a part of the national history. It was invoked again as sectional conflicts increased in the years before the American Civil War. Washington Irving used it as part of an argument against dismemberment of the union in his 1857 Life of George Washington, pointing out that the unity of New England and the southern states which led to independence was made possible in part by holding West Point. Jefferson Davis and other southern secessionist leaders were unfavorably compared to Arnold, implicitly and explicitly likening the idea of secession to treason. Harper's Weekly published an article in 1861 describing Confederate leaders as "a few men directing this colossal treason, by whose side Benedict Arnold shines white as a saint".

Fictional invocations of Benedict Arnold's name carry strongly negative overtones. A moralistic children's tale entitled "The Cruel Boy" was widely circulated in the 19th century. It described a boy who stole eggs from birds' nests, pulled wings off insects, and engaged in other sorts of wanton cruelty, who then grew up to become a traitor to his country. The boy is not identified until the end of the story, when his place of birth is given as Norwich, Connecticut, and his name is given as Benedict Arnold. However, not all depictions of Arnold were so negative. Some theatrical treatments of the 19th century explored his duplicity, seeking to understand rather than demonize it.

Canadian historians have treated Arnold as a relatively minor figure. His difficult time in New Brunswick led historians to summarize it as full of "controversy, resentment, and legal entanglements" and to conclude that he was disliked by both Americans and Loyalists living there. Historian Barry Wilson points out that Arnold's descendants established deep roots in Canada, becoming leading settlers in Upper Canada and Saskatchewan. His descendants are spread across Canada, most of all those of John Sage, who adopted the Arnold surname.

Honors

Boot Monument

The Boot Monument at Saratoga National Historical Park pays tribute to Arnold but does not mention his name. It was donated by Civil War General John Watts DePeyster, and its inscription reads: "In memory of the most brilliant soldier of the Continental army, who was desperately wounded on this spot, winning for his countrymen the decisive battle of the American Revolution, and for himself the rank of Major General." The victory monument at Saratoga has four niches, three of which are occupied by statues of Generals Gates, Schuyler, and Morgan. The fourth niche is pointedly empty.

There are plaques on the grounds of the United States Military Academy at West Point, New York, commemorating all of the generals who served in the Revolution. One plaque bears only a rank and a date but no name: "major general… born 1740". Historical markers in Danvers, Massachusetts, and Newburyport, MA commemorate Arnold's 1775 expedition to Quebec. There are also historical markers bearing his name at Wyman Lake Rest Area on US-201 north of Moscow, Maine, on the western bank of Lake Champlain, New York, and two in Skowhegan, Maine.

The house where Arnold lived at 62 Gloucester Place in central London bears a plaque describing him as an "American Patriot". He was buried at St Mary's Church, Battersea, England which has a commemorative stained glass window. The faculty club at the University of New Brunswick, Fredericton, has a Benedict Arnold Room in which letters written by Arnold hang on the walls.

Marriages and children

Peggy Shippen Arnold and daughter Sophia by Daniel Gardner, c. 1787

Arnold had three sons with Margaret Mansfield:

  • Benedict Arnold (1768–1795) (Captain, British Army in Jamaica)
  • Richard Arnold (1769–1847) (Lieutenant, American Legion cavalry)
  • Henry Arnold (1772–1826) (Lieutenant, American Legion cavalry)

He had five children with Peggy Shippen:

  • Edward Shippen Arnold (1780–1813) (Lieutenant, British Army in India; see Bengal Army)
  • James Robertson Arnold (1781–1854) (Lieutenant General, Royal Engineers)
  • George Arnold (1787–1828) (Lieutenant Colonel, 2nd (or 7th) Bengal Cavalry)
  • Sophia Matilda Arnold (1785–1828)
  • William Fitch Arnold (1794–1846) (Captain, 9th Queen's Royal Lancers)

Arnold left significant bequests in his will to John Sage (born 1786), who has been identified by some historians as a possible illegitimate son, but may also have been a grandchild.

Published works

In popular culture

Aortic valve repair

From Wikipedia, the free encyclopedia
 
Aortic valve repair
 
In aortic regurgitation the cusps do not close completely during the filling phase of the heart (diastole), there is backflow of blood into the left ventricle.
Other namesAortic valve reconstruction
SpecialtyCardiology
ICD-9-CM35.9
Aortic valve repair or aortic valve reconstruction is the reconstruction of both form and function of a dysfunctional aortic valve. Most frequently it is used for the treatment of aortic regurgitation. It can also become necessary for the treatment of aortic aneurysm, less frequently for congenital aortic stenosis.

Background

An aortic valve repair will realistically be possible in the absence of calcification or shrinking (retraction) of the aortic valve. Thus, congenital aortic stenosis may be treated by aortic valve repair. In acquired aortic stenosis valve replacement will be the only realistic option. In most instances, aortic valve repair will be performed for aortic regurgitation (insufficiency). Aortic valve repair may also be performed in the treatment of aortic aneurysm or aortic dissection if either aneurysm or dissection involves the aorta close to the valve.

Indications for aortic valve repair:

  • Absence of relevant calcification and
  • Congenital and severe aortic stenosis with symptoms or decreased left ventricular function
  • Severe aortic regurgitation and symptoms, or leftventricular enlargement (>65 to 70 mm), or decreased left ventricular function (EF < 50%)
  • Ascending aortic aneurysm > 55mm
  • Ascending aortic aneurysm > 50mm and risk factors (e.g. high blood pressure)
  • Ascending aortic aneurysm > 50mm and connective tissue disease
  • Ascending aortic aneurysm > 50mm and risk factors and connective tissue disease

Repair versus replacement

The goal of the operation is the improvement of life expectancy and treatment of heart failure as the consequence of dysfunction of the aortic valve. The goal may also be to avert complications of the aorta (rupture or dissection) in the treatment of aneurysm. Repair is a more recent alternative to replacement; in many instances replacement will be the only realistic option because of severe destruction of the valve.

While replacement of the aortic valve is a safe and reproducible procedure it may still be associated with the long-term occurrence of so-called valve-related complications. The probability of these complications depends on the age of the patient and the type of operation. Typical complications are blood clot formation on the valve or dislodgment of thrombus (embolism); bleeding complications are commonly a consequence of "blood-thinning" medication needed to prevent clots (anticoagulation). Biologic/tissue replacement valves have a tendency to degenerate, and there is also an increased risk of infections of valve prosthesis (prosthetic valve endocarditis).

Compared to the results of valve replacement there will be a minimal tendency towards clot formation after aortic valve repair, and anticoagulation is commonly not necessary, thus minimizing the possibility of bleeding complications. The likelihood of infection of the repaired aortic valve is much lower compared to what is seen after aortic valve replacement. A repair procedure may not last forever, but in many instances the durability of an aortic valve repair will markedly exceed that of a biological prosthesis.

Surgical technique

The details of the aortic valve repair procedure depend on the possibility of congenital malformation of the valve, the type and degree of secondary deformation, and the existence of an aortic aneurysm. The goal of the procedure is the restoration of a normal form of the aortic valve, which will then lead to near-normal function and good durability of the repair. A transesophageal echocardiogram during the operation and prior to the repair will be important to define the exact deformation of the aortic valve and thus the mechanism of regurgitation.

In order to best accommodate the complex geometry of the aortic valve, these procedures are generally performed through open-heart surgery. Minimally invasive procedures limit the ability to precisely judge the form of the aortic valve and will lead to a higher uncertainty regarding function and durability of aortic valve repair. As for aortic valve replacement, the heart-lung machine is usually connected to the patient via aorta and right atrium. The heart is arrested through cardioplegia, and the form of the aortic valve is carefully analyzed. Currently documented predicted values for certain aspects of the form of the aortic valve. are available. Using these parameters and a good transesophageal echocardiogram the precise mechanism of regurgitation can be determined in most cases.

Aortic valve stenosis

Congenital aortic valve stenosis can be treated by aortic valve repair if there is no relevant calcification. In this scenario the aortic valve will almost always be unicuspid and the valve configuration must be altered as part of the procedure in order to improve opening of the valve. Because of the unicuspid form of the valve the repair concept will be similar to that of the regurgitant unicuspid valve.

The traditional treatment of congenital aortic stenosis is balloon valvuloplasty or surgical commissurotomy. Both approaches will frequently not eliminate the narrowing of the valve; in addition, they will lead to a variable degree of aortic valve regurgitation which places an additional burden on the heart. In both interventions some of the valve tissue is opened; the peculiar form aspects of unicuspid aortic valves are not taken into consideration. The repair approach differs from commissurotomy mainly in that not only valve tissue is divided to improve opening, but also at least an additional commissure (suspension point of the valve) is created for the aortic valve. Thus, a bicuspid valve is created which results in near-normal function of the aortic valve.

The most reproducible concept is the creation of a bicuspid aortic valve with two normal commissures and two cusps. Tissue of the aortic valve is removed or detached from the aorta in places where it is clearly abnormal. The location of a second commissure of normal height is determined; using a patch or the original cusp tissue the cusps are then sutured to the aortic wall in order to create cusps of sufficient tissue and adequate form reaching the new commissure.

Aortic regurgitation

Tricuspid aortic valve

In tricuspid aortic valves the anatomy is principally normal; if there is an aneurysm of the ascending aorta the principles of aortic aneurysm will have to be applied. Without aneurysm, the cause of regurgitation is frequently stretching of one or two of the valve components (cusps). Such stretching can be combined with the presence of congenital tissue fenestrations. Additionally, enlargement of the aortic annulus can contribute to valve dysfunction. Shrinkage of the cusps is less frequent in industrial countries; this is currently not well treatable by repair.

In surgical treatment, the extent of cusp stretching is exactly determined and then corrected by sutures. Enlargement of the annulus requires its size reduction and stabilization by an annuloplasty. In the case of annular dilatation, the annulus has to be reduced; currently, the largest experience exists with a strong suture that is placed around the annulus and tied to the desired size. Stretching is corrected by plicating sutures to the point that all cusps have a normal configuration. At the end of the operation, the cusp margins should be at an identical height.

Bicuspid aortic valve

Bicuspid aortic valve which had to be operated on for severe regurgitation. Two of the cusps (upper side right and left) are grown together (fused) since birth. The lack of closure is seen in the central part of the valve, it is caused by stretching of the fused cusp.

In bicuspid aortic valve anatomy, there is congenital fusion of two cusps. This fused cusp is exposed to higher than normal stress and will stretch over time as a consequence. This results in aortic valve regurgitation. Annular enlargement is very frequent in this context, and it increases the tendency to leak. As a result of long-standing dysfunction also the normal cusp may undergo deformation and stretch. In half of the affected individuals there is also an aneurysm of the ascending aorta which has to be treated appropriately.

Repaired bicuspid aortic valve. The stretching of the fused cusp has been corrected by sutures, the correct coaptation of the cusps is easily visible.

Since the bicuspid anatomy commonly has an almost normal valve function (unless deformed) it is left bicuspid; the repair procedure simply corrects the secondary deformations that led to regurgitation. Similar to tricuspid aortic valves, the cusps must be measured to rule out shrinkage. The annulus is commonly enlarged, it must be reduced and stabilized by an annuloplasty. Tissue redundancy through stretching is corrected by sutures.

Unicuspid aortic valve

The unicuspid aortic valve may not only result in relevant stenosis (narrowing), it may also primarily lead to regurgitation. In a proportion of the affected individuals, an aneurysm of the ascending aorta may be present which may need treatment as well. The repair procedure will change the configuration of the valve by creating at least one additional commissure. Commonly the unicuspid valve is changed into a bicuspid configuration; the resulting valve function will be close to normal. Cusp tissue is resected where it is grossly abnormal. Using patch tissue, the cusps are enlarged so they reach the second (new) commissure. If the annulus is enlarged it must be reduced and stabilized.

Quadricuspid aortic valve

Aortic regurgitation in a quadricuspid valve is commonly caused by the additional (4th) commissure, which holds back cusp tissue and keeps it from closing adequately. Currently, the most reliable concept for repair of a quadricuspid valve seems to be its conversion into a tricuspid valve. In some cases a bicuspid configuration may be appropriate. In order to achieve this cusp, tissue is detached from the aorta and the valve is then brought into adequate form.

Aneurysm of the ascending aorta

The enlargement of the ascending aorta may lead to aortic valve regurgitation because the outward tension on the cusps prevents their adequate closure. Regurgitation may also (in part) be due to congenital malformation of the aortic valve or concomitant stretching of a tricuspid aortic valve. Life expectancy may be limited by severe aortic regurgitation. The aneurysm of the ascending aorta may also become so large that it can develop rupture or dissection as life-threatening complications.[citation needed]

The operation must address the aneurysm by replacing the enlarged part of the aorta. Since the aortic valve is very sensitive in its form and function to any changes of the aortic dimensions, the operation will in most cases also have to address the valve, i.e. apply the principles of aortic valve repair. This principle applies to tricuspid valves as well as bicuspid or unicuspid aortic valves.

The goal of the operation is to eliminate the aneurysm and to preserve or repair the aortic valve. The operation may include replacement of the aortic root. Replacement of the root is usually not necessary if its diameter is less than 40 to 45 mm. In those instances replacement of the ascending aorta is sufficient. If root diameter exceeds 45 mm it will have to be replaced in many instances. There are mainly 2 operative techniques currently used, and both lead to similar results. With both techniques the aortic valve must be carefully assessed after replacement of the root; repair of any aortic valve abnormalities is necessary in order to achieve good and durable valve function.

Operative details

There are two options: tubular ascending aortic replacement or replacement of the aortic root.

Tubular ascending aortic replacement

The aorta is divided above the aortic valve and root. The avascular graft is then sutured to the aortic root. The form of the aortic valve may have been changed by this maneuver, it thus has to be carefully checked. Often stretching of a cusp becomes apparent at that point, and this will have to correct by sutures (see 3.3.1, 3.3.2).

Replacement of the aortic root

After the heart has been arrested, the enlarged aorta is removed close to the insertion line of the aortic valve cusps. The origins of the coronary arteries must be detached from the aorta. For the procedure, according to Magdi Yacoub a graft is tailored to create 3 tongues that replace the aneurysmatic aortic wall in the root. The graft is then sutured to the cusp insertion lines. Some surgeons combine this procedure with an annuloplasty. For the procedure according to Tirone David, the aortic valve is mobilized even further from the surrounding tissues. The avascular graft is then positioned around the valve, and the valve is fixed inside the graft with sutures.

With both techniques, the form of the aortic valve must be carefully assessed after completed root replacement. In most instances some cusp stretching will be found which would result in prolapse and relevant regurgitation afterward if uncorrected. Thus an aortic valve repair procedure will frequently be necessary according to the principles of tricuspid or bicuspid aortic valve repair.

Postoperative treatment

Contrary to valve replacement with mechanical prostheses inhibition of the blood clotting system (anticoagulation) is not necessary after aortic valve repair. Blood-thinning may only be necessary if atrial fibrillation occurs or persists in order to prevent blood clot formation in the left atrium.

Following aortic valve replacement, prophylactic administration of antibiotics is recommended for interventions involving mouth and throat (e.g. dental surgery). It is unclear whether this is also necessary after aortic valve repair.

History

First attempts at aortic valve repair were undertaken even before heart valve prostheses were developed. In 1912 the French surgeon Theodore Tuffier widened a stenotic (narrowed) aortic valve. The colleagues of Dwight Harken reported in 1958 on their experience with aortic valve repair for aortic regurgitation by narrowing the annulus of the aortic valve. In those times, both surgeons and cardiologists had minimal information on the exact nature and severity of dysfunction of the aortic valve. This changed with the development of echocardiography by Inge Edler and Carl Hellmuth Hertz in the early 1950s. Nonetheless, the development of heart valve prostheses made replacement the standard approach because of its reproducibility. The first ball-cage valve was implanted in 1961 by the American surgeons Albert Starr and Lowell Edwards, and in the next decades many mechanical and biological prostheses were developed and used. The positive results with the repair of the mitral valve stimulated surgeons in the 1980s and 1990s to develop surgical techniques that could be applied for the different causes of aortic regurgitation. Stepwise improvements were introduced in the subsequent years; today many regurgitant aortic valves can be treated by repair.

Microchip implant (human)

From Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Microchip_implant_(human)

A human microchip implant is any electronic device implanted subcutaneously (subdermally) usually via an injection. Examples include an identifying integrated circuit RFID device encased in silicate glass which is implanted in the body of a human being. This type of subdermal implant usually contains a unique ID number that can be linked to information contained in an external database, such as identity document, criminal record, medical history, medications, address book, and other potential uses.

History

  • 1998: The first experiments with a radio-frequency identification (RFID) implant were carried out in 1998 by the British scientist Kevin Warwick. His implant was used to open doors, switch on lights, and cause verbal output within a building. After nine days the implant was removed and has since been held in the Science Museum in London.
  • March 18, 2004: Nokia, Philips (now under NXP Semiconductors) and Sony established the NFC Forum, a non-profit industry formed to advance the use of NFC wireless interaction in consumer electronics, mobile devices and PCs. Standards include the four distinct tag types that provide different communication speeds and capabilities covering flexibility, memory, security, data retention and write endurance. NFC Forum promotes implementation and standardization of NFC technology to ensure interoperability between devices and services.
  • 2018: VivoKey Technologies developed the first cryptographically secure human implantable NFC transponders in 2018. The Spark is an AES128 bit capable ISO/IEC 15693 2mm by 12mm bioglass encased injectable device. The Flex One is an implantable contactless secure element, capable of running Java Card applets (software programs) including Bitcoin wallets, PGP, OATH OTP, U2F, WebAuthn, etc. It is encapsulated in a flat, flexible 7mm x 34mm x 0.4mm flat biopolymer shell. Applets can be deployed to the Flex One before or after implantation.
  • 2019: Bill & Melinda Gates Foundation funded MIT to develop an invisible microneedle patch to store medical information under the skin with a dye.
  • 28 August 2020: Neuralink CEO Elon Musk, held a broadcast showcasing a pig with a coin-sized computer chip in her brain to demonstrate the company's plans to create a working brain-to-machine interface for humans.
  • 2021: Dsruptive Subdermals tested a COVID-19 vaccine passport in their bioglass-coated NFC microchip designed to be implanted in the subcutaneous tissue. It has been demonstrated by its managing director Hannes Sjöblad who wears the chip in his arm, but it is not yet for sale.

Chipped individuals

A surgeon implants British scientist Dr Mark Gasson in his left hand with an RFID microchip (March 16, 2009)

Several hobbyists, through to scientists and business personalities have placed RFID microchip implants into their hands or had them inserted by others.

  • 2005, Amal Graafstra: In early March 2005 hobbyist Amal Graafstra implanted a 125 kHz EM4102 bioglass-encased RFID transponder into his left hand. It was used with an access control system to gain entry to his office. Soon after in June 2005 he implanted a more advanced HITAG S 2048 low frequency transponder. In 2006 he authored the book RFID Toys, Graafstra uses his implants to access his home, open car doors, and to log on to his computer. With public interest growing, in 2013 he launched biohacking company Dangerous Things and crowdfunded the world's first implantable NFC transponder in 2014. He has also spoken at various events and promotional gigs including TEDx, and built a smartgun that only fires after reading his implant.
  • 2006, Mikey Sklar: Mikey Sklar had a chip implanted into his left hand and filmed the procedure.
  • 2009, Mark Gasson: On 16 March 2009 British scientist Mark Gasson had a glass capsule RFID device surgically implanted into his left hand. In April 2010 Gasson's team demonstrated how a computer virus could wirelessly infect his implant and then be transmitted on to other systems.
  • 2013, Tim Cannon: In October 2013, Cannon became the first person to be implanted with the Grindhouse-designed biometric sensor known as Circadia, a procedure which was performed by body modification artist Steve Haworth in Essen, Germany.
  • 2014, Martijn Wismeijer: Dutch marketing manager for Bitcoin ATM manufacturer General Bytes, placed RFID chips in both of his hands to store his Bitcoin private keys and business card.
  • 2014, Nikolas Badminton: In June 2014, during the From Now Conference in Vancouver, Canada, event organizer and futurist Nikolas Badminton had an xNT chip implanted into his left hand on stage by noted biohacker Amal Graafstra.
  • 2015, Jonathan Oxer: Self-implanted an RFID chip in his arm using a veterinary implantation tool.
  • 2015, Patric Lanhed: sent a “bio-payment” of one euro worth of Bitcoin using a chip embedded in his hand.
  • 2016, Hannes Sjöblad: Biohacker Hannes Sjöblad has been experimenting with near field communication (NFC) chip implants since 2015. During his talk at Echappée Voléé 2016 in Paris, Sjöblad disclosed that he has also implanted himself with a chip between his forefinger and thumb and uses it to unlock doors, make payments, unlock his phone, and essentially replacing anything that is put in one's pockets. Additionally, Sjöblad has hosted several "implant parties," where interested individuals can also be implanted with the chip. In October 2021, Sjöblad appeared in a video interview with Aftonbladet where he demonstrated how he receives a QR code when he scans a microchip implant in his arm that contains his EU Digital COVID Certificate (EUDCC).
  • Marcel Varallo had an NXP chip coated in Bioglass 8625 inserted into his hand between his forefinger and thumb allowing him to open secure elevators and doors at work, print from secure printers, unlock his mobile phone and home, and store his digital business card for transfer to mobile phones enabled for NFC.
  • 2021, Shain Lakin: In late September 2021 during the Security BSides Perth 2021 Conference, Hacker Shain Lakin demonstrated using an NXP Semiconductors chip inserted into his hand to remotely trigger ignition of a thermite charge in order to destroy a Solid-state drive (SSD) inside a personal computer.

Types of implants

Usage

For Microchip implants that are encapsulated in silicate glass there exists multiple methods to embed the device subcutaneously ranging from placing the microchip implant in a syringe or trocar and piercing under the flesh (subdermal) then releasing the syringe to using a cutting tool such as a surgical scalpel to cut open subdermal and positioning the implant in the open wound.

A list of popular uses for microchip implants are as follows;

Other uses either cosmetic or medical may also include;

Digital identity

RFID implants using NFC technologies have been used as access cards ranging for car door entry to building access. Secure identity has also been used to encapsulate or impersonate a users identity via secure element or related technologies.

Medical records

Researchers have examined microchip implants in humans in the medical field and they indicate that there are potential benefits and risks to incorporating the device in the medical field. For example, it could be beneficial for noncompliant patients but still poses great risks for potential misuse of the device.

Destron Fearing, a subsidiary of Digital Angel, initially developed the technology for the VeriChip.

In 2004, the VeriChip implanted device and reader were classified as Class II: General controls with special controls by the FDA; that year the FDA also published a draft guidance describing the special controls required to market such devices.

About the size of a grain of rice, the device was typically implanted between the shoulder and elbow area of an individual's right arm. Once scanned at the proper frequency, the chip responded with a unique 16-digit number which could be then linked with information about the user held on a database for identity verification, medical records access and other uses. The insertion procedure was performed under local anesthetic in a physician's office.

Privacy advocates raised concerns regarding potential abuse of the chip, with some warning that adoption by governments as a compulsory identification program could lead to erosion of civil liberties, as well as identity theft if the device should be hacked. Another ethical dilemma posed by the technology, is that people with dementia could possibly benefit the most from an implanted device that contained their medical records, but issues of informed consent are the most difficult in precisely such people.

In June 2007, the American Medical Association declared that "implantable radio frequency identification (RFID) devices may help to identify patients, thereby improving the safety and efficiency of patient care, and may be used to enable secure access to patient clinical information", but in the same year, news reports linking similar devices to cancer caused in laboratory animals.

In 2010, the company, by then called PositiveID, withdrew the product from the market due to poor sales.

In January 2012, PositiveID sold the chip assets to a company called VeriTeQ that was owned by Scott Silverman, the former CEO of Positive ID.

In 2016, JAMM Technologies acquired the chip assets from VeriTeQ; JAMM's business plan was to partner with companies selling implanted medical devices and use the RFID tags to monitor and identify the devices. JAMM Technologies is co-located in the same Plymouth, Minnesota building as Geissler Corporation with Randolph K. Geissler and Donald R. Brattain listed as its principals. The website also claims that Geissler was CEO of PositiveID Corporation, Destron Fearing Corporation, and Digital Angel Corporation.

In 2018, A Danish firm called BiChip released a new generation of microchip implant that is intended to be readable from a distance and connected to Internet. The company released an update for its microchip implant to associate it with the Ripple cryptocurrency to allow payments to be made using the implanted microchip.

Patients that undergo NFC implants do so for a variety of reasons ranging from, Biomedical diagnostics, health reasons to gaining new senses, gain biological enhancement, to be part of existing growing movements, for workplace purposes, security, hobbyists and for scientific endeavour.

In 2020, A London-based firm called Impli released a microchip implant that is intended to be used with an accompanying smartphone app. The primary functionality of the implant is as a storage of medical records. The implant can be scanned by any smartphone that has NFC capabilities.

Building access and security

In February 2006, CityWatcher, Inc. of Cincinnati, OH became the first company in the world to implant microchips into their employees as part of their building access control and security system. The workers needed the implants to access the company's secure video tape room, as documented in USA Today. The project was initiated and implemented by Six Sigma Security, Inc. The VeriChip Corporation had originally marketed the implant as a way to restrict access to secure facilities such as power plants.

A major drawback for such systems is the relative ease with which the 16-digit ID number contained in a chip implant can be obtained and cloned using a hand-held device, a problem that has been demonstrated publicly by security researcher Jonathan Westhues and documented in the May 2006 issue of Wired magazine, among other places.

  • The Baja Beach Club, a nightclub in Rotterdam, the Netherlands, once used VeriChip implants for identifying VIP guests.
  • The Epicenter in Stockholm, Sweden is using RFID implants for employees to operate security doors, copiers, and pay for lunch.

Proposed uses

In 2017, Mike Miller, chief executive of the World Olympians Association, was widely reported as suggesting the use of such implants in athletes in an attempt to reduce problems in sports due to recreational drug use.

Theoretically, a GPS-enabled chip could one day make it possible for individuals to be physically located by latitude, longitude, altitude, and velocity. Such implantable GPS devices are not technically feasible at this time. However, if widely deployed at some future point, implantable GPS devices could conceivably allow authorities to locate missing people, fugitives, or those who fled a crime scene. Critics contend that the technology could lead to political repression as governments could use implants to track and persecute human rights activists, labor activists, civil dissidents, and political opponents; criminals and domestic abusers could use them to stalk, harass, and/or abduct their victims.

Some have theorized that governments could use implants for:

Criticisms and concerns

Infection

Infection has been cited as a source of failure within RFID and related microchip implanted individuals, either due to improper implantation techniques, implant rejections or corrosion of implant elements.

MRIs

An X-ray of a biohacker's hand showing several implants.

Some chipped individuals have reported being turned away from MRIs due to the presence of magnets in their body. No conclusive investigation has been done on the risks of each type of implant near MRIs, other than anecdotal reports ranging from no problems, requiring hand shielding before proximity, to being denied the MRI.

Other medical imaging technologies like X-ray and CT scanners do not pose a similar risk. Rather, X-rays can be used to locate implants.

Corrosion

Electronics-based implants contain little material that can corrode. Magnetic implants, however, often contain a substantial amount of metallic elements by volume, and iron, a common implant element, is easily corroded by common elements such as oxygen and water. Implant corrosion occurs when these elements become trapped inside during the encapsulation process, which can cause slow corrosive effect, or the encapsulation fails and allows corrosive elements to come into contact with the magnet. Catastrophic encapsulation failures are usually obvious, resulting in tenderness, discoloration of the skin, and a slight inflammatory response. Small failures however can take much longer to become obvious, resulting in a slow degradation of field strength without many external signs that something is slowly going wrong with the magnet.

Cancer risks

In a self-published report, anti-RFID advocate Katherine Albrecht, who refers to RFID devices as "spy chips", cites veterinary and toxicological studies carried out from 1996 to 2006 which found lab rodents injected with microchips as an incidental part of unrelated experiments and dogs implanted with identification microchips sometimes developed cancerous tumors at the injection site (subcutaneous sarcomas) as evidence of a human implantation risk. However, the link between foreign-body tumorigenesis in lab animals and implantation in humans has been publicly refuted as erroneous and misleading and the report's author has been criticized over the use of "provocative" language "not based in scientific fact". Notably, none of the studies cited specifically set out to investigate the cancer risk of implanted microchips and so none of the studies had a control group of animals that did not get implanted. While the issue is considered worthy of further investigation, one of the studies cited cautioned "Blind leaps from the detection of tumors to the prediction of human health risk should be avoided".

Stolen identity, privacy, security risks

The Council on Ethical and Judicial Affairs (CEJA) of the American Medical Association published a report in 2007 alleging that RFID implanted chips may compromise privacy because even though no information can be stored in an RFID transponder, they allege that there is no assurance that the information contained in the chip can be properly protected.

Stolen identity and privacy has been a major concern with Microchip implants being cloned for various nefarious reasons in a process known as Wireless identity theft. Incidents of forced removal of animal implants have been documented, the concern lies in whether this same practice will be used to attack implanted microchipped patients also. Due to low adoption of microchip implants incidents of these physical attacks are rare. Nefarious RFID reprogramming of unprotected or unencrypted microchip tags are also a major security risk consideration.

Risk to human freedom and autonomy

There is concern that this technology can be abused. Opponents have stated that such invasive technology has the potential to be used by governments to create an 'Orwellian' digital dystopia and theorized that in such a world, self-determination, the ability to think freely, and all personal autonomy could be completely lost.

Ableism

In 2019, Elon Musk announced that a company he had founded which deals with microchip implant research, called Neuralink, would be able to "solve" autism and other "brain diseases". This led to a number of critics calling out Musk for his statements, with Dan Robitzski of Neoscope saying, "while schizophrenia can be a debilitating mental condition, autism is more tightly linked to a sense of identity — and listing it as a disease to be solved as Musk did risks further stigmatizing a community pushing for better treatment and representation." Hilary Brueck of Insider agreed, saying, "conditions like autism can't be neatly cataloged as things to "solve." Instead, they lead people to think differently". She went on to argue though that the technology shouldn't be discounted entirely, as it could potentially help people with a variety of disabilities such as blindness and quadriplegia. Fellow Insider writer Isobel Asher Hamilton added, "it was not clear what Musk meant by saying Neuralink could "solve" autism, which is not a disease but a developmental disorder." She then cited The UK's National Autistic Society's website statement, which says, "Autism is not an illness or disease and cannot be 'cured.' Often people feel being autistic is a fundamental aspect of their identity." Tristan Greene of The Next Web stated, in response to Musk, "there’s only one problem: autism isn’t a disease and it can’t be cured or solved. In fact, there’s some ethical debate in the medical community over whether autism, which is considered a disorder, should be treated as part of a person’s identity and not a ‘condition’ to be fixed... how freaking cool would it be to actually start your Tesla [electric vehicle] just by thinking? But, maybe... just maybe, the billionaire with access to the world's brightest medical minds who, even after founding a medical startup, still incorrectly thinks that autism is a disease that can be solved or cured shouldn't be someone we trust to shove wires or chips into our brains."

Some autistic people also spoke out against Musk's statement about using microchips to "solve" autism, with Nera Birch of The Mighty, an openly autistic writer, stating, "autism is a huge part of who I am. It pervades every aspect of my life. Sure, there are days where being neurotypical would make everything so much easier. But I wouldn’t trade my autism for the world. I have the unique ability to view the world and experience senses in a way that makes all the negatives of autism worth it. The fact you think I would want to be “cured” is like saying I would rather be nothing than be myself. People with neurodiversity are proud of ourselves. For many of us, we wear our autism as a badge of pride. We have a culture within ourselves. It is not something that needs to be erased. The person with autism is not the problem. Neurotypical people need to stop molding us into something they want to interact with." Florence Grant, an openly autistic writer for The Independent, stated, "autistic people often have highly-focused interests, also known as special interests. I love my ability to hyperfocus and how passionate I get about things. I also notice small details and things that other people don’t see. I see the world differently, through a clear lens, and this means I can identify solutions where other people can’t. Does this sound familiar, Elon? My autism is a part of me, and it’s not something that can be separated from me. I should be able to exist freely autistic and proud. But for that to happen, the world needs to stop punishing difference and start embracing it." Grant noted that Musk himself had recently admitted that he had been diagnosed with Asperger's syndrome (itself an outdated diagnosis, the characteristics of which are currently recognized as part of the autism spectrum) while hosting Saturday Night Live.

Musk himself has not specified how Neuralink's microchip technology would "solve" autism, and has not commented publicly on the feedback from autistic people.

Misinformation

Despite a lack of evidence demonstrating invasive use or even technical capability of microchip implants, they have been the subject of many conspiracy theories.

The Southern Poverty Law Center reported in 2010 that on the Christian right, there were concerns that implants could be the "mark of the beast" and amongst the Patriot movement there were fears that implants could be used to track people. The same year NPR reported that a myth was circulating online that patients who signed up to receive treatment under the Affordable Care Act (Obamacare) would be implanted.

In 2016, Snopes reported that being injected with microchips was a "perennial concern to the conspiracy-minded" and noted that a conspiracy theory was circulating in Australia at that time that the government was going to implant all of its citizens.

A 2021 survey by YouGov found that 20% of Americans believed microchips were inside the COVID-19 vaccines. A 2021 Facebook post by RT (Russia Today) claimed DARPA had developed a COVID-19 detecting microchip implant.

Legislation

A few jurisdictions have researched or preemptively passed laws regarding human implantation of microchips.

United States

In the United States, many states such as Wisconsin (as of 2006), North Dakota (2007), California (2007), Oklahoma (2008), and Georgia (2010) have laws making it illegal to force a person to have a microchip implanted, though politicians acknowledge they are unaware of cases of such forced implantation. In 2010, Virginia passed a bill forbidding companies from forcing employees to be implanted with tracking devices.

In 2010, Washington's House of Representatives introduced a bill ordering the study of potential monitoring of sex offenders with implanted RFID or similar technology, but it did not pass.

Views

The general public are most familiar with microchips in the context of identifying pets.

In popular culture

Implanted individuals are considered to be grouped together as part of the transhumanism movement.

"Arkangel", an episode of the drama series Black Mirror, considered the potential for helicopter parenting of an imagined more advanced microchip.

Microchip implants have been explored in Cyberpunk media such as Ghost in the Shell, Cyberpunk 2077, and Deus Ex.

Religious beliefs

Some Christians make a link between implants and the Biblical Mark of the Beast, prophesied to be a future requirement for buying and selling, and a key element of the Book of Revelation. Gary Wohlscheid, president of These Last Days Ministries, has argued that "Out of all the technologies with potential to be the mark of the beast, VeriChip has got the best possibility right now".

Ballistic missile

From Wikipedia, the free encyclopedia
Minuteman-III MIRV launch sequence:
  • 1. The missile launches out of its silo by firing its 1st-stage boost motor (A).
  • 2. About 60 seconds after launch, the 1st-stage drops off and the 2nd-stage motor (B) ignites. The missile shroud (E) is ejected.
  • 3. About 120 seconds after launch, the 3rd-stage motor (C) ignites and separates from the 2nd stage.
  • 4. About 180 seconds after launch, 3rd-stage thrust terminates and the post-boost vehicle (D) separates from the rocket.
  • 5. The post-boost vehicle maneuvers itself and prepares for re-entry vehicle (RV) deployment.
  • 6. The RVs, as well as decoys and chaff, are deployed.
  • 7. The RVs (now armed) and chaff re-enter the atmosphere at high speeds.
  • 8. The nuclear warheads detonate.

A ballistic missile is a type of missile that uses projectile motion to deliver warheads on a target. These weapons are powered only during relatively brief periods—most of the flight is unpowered. Short-range ballistic missiles stay within the Earth's atmosphere, while intercontinental ballistic missiles (ICBMs) are launched on a sub-orbital flight.

These weapons are in a distinct category from cruise missiles, which are aerodynamically guided in powered flight. Unlike cruise missiles, which are restricted to the atmosphere, it is advantageous for ballistic missiles to avoid the denser parts of the atmosphere and they may travel above the atmosphere into outer space.

History

Replica V-2

The earliest form of ballistic missile dates from the 13th century with its use derived from the history of rockets. In the 14th century, the Ming Chinese navy used an early form of a ballistic missile weapon called the Huolongchushui in naval battles against enemy ships.

One modern pioneer ballistic missile was the A-4, commonly known as the V-2 developed by Nazi Germany in the 1930s and 1940s under the direction of Wernher von Braun. The first successful launch of a V-2 was on October 3, 1942, and it began operation on September 6, 1944, against Paris, followed by an attack on London two days later. By the end of World War II in Europe in May 1945, more than 3,000 V-2s had been launched.

The R-7 Semyorka was the first intercontinental ballistic missile.

Side view of Minuteman-III ICBM

Flight

An intercontinental ballistic missile trajectory consists of three parts: the powered flight portion; the free-flight portion, which constitutes most of the flight time; and the re-entry phase, where the missile re-enters the Earth's atmosphere. The flight phases for shorter-range ballistic missiles are essentially the first two phases of the ICBM, as some ballistic categories do not leave the atmosphere.

Ballistic missiles can be launched from fixed sites or mobile launchers, including vehicles (e.g., transporter erector launchers), aircraft, ships, and submarines. The powered flight portion can last from a few tenths of seconds to several minutes and can consist of multiple rocket stages.

When the fuel is exhausted, no more thrust is provided and the missile enters free flight. In order to cover large distances, ballistic missiles are usually launched into a high sub-orbital spaceflight; for intercontinental missiles, the highest altitude (apogee) reached during free-flight is about 4,500 kilometers (2,800 mi).

The re-entry stage begins at an altitude where atmospheric drag plays a significant part in missile trajectory, and lasts until missile impact. Re-entry vehicles re-enter the Earth's atmosphere at very high velocities, on the order of 6–8 kilometers per second (22,000–29,000 km/h; 13,000–18,000 mph) at ICBM ranges.

Types

Trident II SLBM launched by ballistic missile submarine

Ballistic missiles vary widely in range and use, and are often divided into categories based on range. Various schemes are used by different countries to categorize the ranges of ballistic missiles:

Most current designs have intercontinental range with a notable exception of Indian operational SLBM Sagarika and K-4 as well as North Korea's currently operationally deployed KN-11 which might not have intercontinental range. A comparable missile would be the decommissioned China's JL-1 SLBM with a range of less than 2,500 km.

Tactical short- and medium-range missiles are often collectively referred to as tactical and theatre ballistic missiles, respectively. Long- and medium-range ballistic missiles are generally designed to deliver nuclear weapons because their payload is too limited for conventional explosives to be cost-effective in comparison to conventional bomber aircraft (though the U.S. is evaluating the idea of a conventionally armed ICBM for near-instant global air strike capability, despite the high costs).

Quasi-ballistic missiles

A quasi-ballistic missile (also called a semi-ballistic missile) is a category of missile that has a low trajectory and/or is largely ballistic but can perform maneuvers in flight or make unexpected changes in direction and range. They include anti-ship ballistic missiles. At a lower trajectory than a ballistic missile, a quasi-ballistic missile can maintain higher speed, thus allowing its target less time to react to the attack, at the cost of reduced range.

The Russian Iskander is a quasi-ballistic missile. The Russian Iskander-M cruises at hypersonic speed of 2,100–2,600 m/s (Mach 6–7) at a height of 50 km. The Iskander-M weighs 4,615 kg, carries a warhead of 710–800 kg, has a range of 480 km and achieves a CEP of 5–7 meters. During flight it can maneuver at different altitudes and trajectories to evade anti-ballistic missiles.

List of quasi-ballistic missiles

 India

 Soviet Union\ Russia

Hypersonic ballistic missile

Many ballistic missiles reach hypersonic speeds (i.e. Mach 5 and above) when they re-enter the atmosphere from space. However, in common military terminology, the term "hypersonic ballistic missile" is generally only given to those that can be maneuvered before hitting their target and don't follow a simple ballistic trajectory.

Throw-weight

Throw-weight is a measure of the effective weight of ballistic missile payloads. It is measured in kilograms or tonnes. Throw-weight equals the total weight of a missile's warheads, reentry vehicles, self-contained dispensing mechanisms, penetration aids, and missile guidance systems: generally all components except for the launch rocket booster and launch fuel. Throw-weight may refer to any type of warhead, but in normal modern usage, it refers almost exclusively to nuclear or thermonuclear payloads. It was once also a consideration in the design of naval ships and the number and size of their guns.

Throw-weight was used as a criterion in classifying different types of missiles during Strategic Arms Limitation Talks between the Soviet Union and the United States. The term became politically controversial during debates over the arms control accord, as critics of the treaty alleged that Soviet missiles were able to carry larger payloads and so enabled the Soviets to maintain higher throw-weight than an American force with a roughly comparable number of lower-payload missiles.

The missiles with the world's heaviest payloads are the Russian SS-18 and Chinese CSS-4 and as of 2017, Russia was developing a new heavy-lift, liquid-propellant ICBM called the Sarmat.

Depressed trajectory

Throw-weight is normally calculated using an optimal ballistic trajectory from one point on the surface of the Earth to another. An optimal trajectory maximizes the total payload (throw-weight) using the available impulse of the missile. By reducing the payload weight, different trajectories can be selected, which can either increase the nominal range or decrease the total time in flight.

A depressed trajectory is non-optimal, as a lower and flatter trajectory takes less time between launch and impact but has a lower throw-weight. The primary reasons to choose a depressed trajectory are to evade anti-ballistic missile systems by reducing the time available to shoot down the attacking vehicle (especially during the vulnerable burn-phase against space-based ABM systems) or a nuclear first-strike scenario. An alternate, non-military purpose for a depressed trajectory is in conjunction with the spaceplane concept with use of air-breathing engines, which requires the ballistic missile to remain low enough inside the atmosphere for air-breathing engines to function.

Combat use

The following ballistic missiles have been used in combat:

Introduction to entropy

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Introduct...