Peggy Shippen
In 1779, when she was nineteen years old, Peggy Shippen married Benedict Arnold, a general in the Continental Army.  Later, Arnold decided to defect, or change sides, and fight for the British instead.  Historians do not know whether Peggy Shippen tried to get him to make this decision, but she helped him after he did.  Shippen helped him meet with John André and then sent letters between the two men using codes. Shippen helped Arnold become the commander of West Point so he could trade it to the British Army.