Counterintelligence: Benedict Arnold

Benedict Arnold was an early American hero of the Revolutionary War who later became one of the most infamous traitors in U.S. history after he switched sides and fought for the British.  In 1779, he begun secret negotiations with the British to surrender West Point to them in exchange for money and a command in the British army, but his plot was soon exposed.  Arnold escaped to British lines before he could be arrested, and later died in London June 14, 1801.

(From:  http://www.history.com/topics/american-revolution/benedict-arnold)