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In July 1780, Arnold sought and obtained command of the fort at West Point. Arnold offered to hand the fort over to the British for £20,300 and a Brigadier's commission. Arnold's plot was exposed in September 1780 when Major André was captured by American troops while carrying incriminating documents. Arnold fled to New York City when he learned of André's capture; on October 2, 1780 at Tappan, New York, the thirty year old André was hanged as a British spy.