He was once one of America's greatest generals. During the Revolution, he captured Fort Ticonderoga with Ethan Allen and defeated the British at Saratoga. But it was on this date, Aug. 30, 1780, that Gen. Benedict Arnold conspired with Gen. Clinton of Britain to surrender West Point for 20,000 pounds. When discovered, George Washington wrote: "Treason of the blackest dye was yesterday discovered! Gen. Arnold, who commanded at West Point, was about to ... give the American cause a deadly wound if not fatal stab. .... Its [discovery] affords the most convincing proof that the Liberties of America are the object of divine Protection."