Arnold's act of treason

September 21, 1780

Arnold's act of treason

After the death of his first wife, Benedict Arnold met and married Peggy Shippen, the daughter of a Loyalist sympathizer. Through her he began a correspondence with John Andre who was a major in the British army. Arnold and Andre met in person on September 21, 1780, to finalize plans for the British takeover of West Point.

http://www.biography.com/people/benedict-arnold-9189320?page=1