1741–1801, American Revolutionary general and traitor, b. Norwich, Conn. As a youth he served for a time in the colonial militia in the French and Indian Wars. He later became a prosperous merchant. An early supporter of the Revolution, he proved to be a resourceful and energetic officer. His expedition against Fort Ticonderoga joined that of Ethan Allen, and the joint command took the fort. Arnold pushed on to the northern end of Lake Champlain, where he destroyed a number of ships and a British fort. In the Quebec campaign, he invaded Canada (1775) by way of the Maine forests. After a grueling march, the exhausted force reached Quebec. Richard Montgomery arrived from Montreal, and the two small armies launched an unsuccessful assault on Dec. 31, 1775. Arnold was wounded but continued the siege until spring, when Sir Guy Carleton forced him back to Lake Champlain. There he built a small fleet that, although defeated, halted the British advance.
In Feb., 1777, Congress, despite General Washington's protests, promoted five brigadier generals of junior rank to major generalships over Arnold's head. This and subsequent slights by Congress embittered Arnold and may in part have motivated his later treason. Although he soon won promotion by his spectacular defense (1777) against William Tryon in Connecticut, his seniority was not restored. In the Saratoga campaign, his relief of Fort Stanwix and his brilliant campaigning under Horatio Gates played a decisive part in the American victory. He became (1778) commander of Philadelphia, after the British evacuation, and there married Peggy Shippen, whose family had Loyalist sympathies.
In 1779 he was court-martialed because of disputes with the government of Pennsylvania, led by Joseph Reed. He was cleared of all except minor charges and was reprimanded by Washington, who subsequently gave (1780) Arnold command of West Point. He had already begun a treasonable correspondence with Sir Henry Clinton in New York City, and now arranged to betray West Point in exchange for a British commission and money. The plot was discovered with the capture of John André, but Arnold escaped. In 1781, in the British service, he led two savage raids—against Virginia and against New London, Conn.—before going into exile in England and Canada, where he was generally scorned and unrewarded.
- O. Sherwin (1931), M. Decker (1932, repr. 1969), C. Brandt (1994), and J. K. Martin (1998);.
- C. Van Doren, Secret History of the American Revolution (1941, repr. 1968);.
- The Traitor and the Spy (1953);. ,
- W. M. Wallace, Traitorous Hero (1954, repr. 1970).
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