After sustaining injury in 1777 while fighting for the revolutionary cause, Benedict Arnold was appointed military governor of Philadelphia, where he married Peggy Shippen, a Loyalist, and began communicating with British forces. Arnold was given command of the U.S. post at West Point and offered to sell it to British general Henry Clinton. He and his British handler, John André, agreed on terms, but André was captured by American forces. The plot was discovered; André was hanged. Arnold joined British forces and eventually fled to Britain.