US General, born January 14, 1741 in Norwich (Connecticut) and died in London on June 14, 1801, famous for his betrayal of the cause of the thirteen colonies in the fight for independence against Britain.
Son of a landowner, in his youth he/she enlisted in the colonial militia to fight in the war against France and later fought against the Indians. In 1762 he/she moved to New Haven, he/she was appointed captain of militia, and became an important merchant. In 1767 he/she married Margaret Mansfield, with whom he/she had four children. At the outbreak of the war for independence in 1775, he/she served with the Ethan Allen troops which conquered the English strong Ticonderoga (may 1775). Then received the order of George Washington go to the North and to capture Quebec: in the attack on the fortified city his troops were rejected and he/she was injured, so it was forced to withdraw to the positions of Lake Champlain. During the following year he/she kept defensive battles that managed to contain the English attacks and prevented their advance toward New York, which earned him the promotion to general. In February, 1777 Congress rose in the rankings five generals who were behind Arnold, which provoked the resentment of this and probably influenced his later treachery; However, continued emphasizing different battles, as the defense of Danbury (April 1777), the assistance to Fort Stanwix (August 1777) and participation in the decisive battle of Saratoga, which fought in the vanguard to be wounded.
In 1778 he/she was assigned as Commander of the garrison of Philadelphia, city where he/she began to socialise and interact with groups loyal to the British Crown, and a year later married Margaret Shippen, known for their sympathies towards the British, with whom he/she had five children. Despite being judged for violating military regulations, and that the same Washington rebuked him for his attitude, managed to be appointed commander of West Point (1780), and moved both by economic as by resentment ambition, began to sell military secrets to the enemy, aided by his wife. Through an English spy, major John André, maintained contact with general Henry Clinton, who thought to give the square to its control in Exchange for twenty thousand pounds and a post in the British army, but the plan was discovered and Arnold managed to escape aboard a boat.
As a general of the British Crown (1781), were distinguished by the cruelty of their campaigns, with the destruction of new London (Connecticut) and Fort Griswold decision. At the end of the conflict, tried unsuccessfully to engage in business and, finally, scorned even by the British, he/she moved to London where he/she died.