Question: John André (2 May 1750 – 2 October 1780) was a British Army officer, hanged as a spy by the Continental Army during the American Revolutionary War for assisting with the attempted surrender of the fort at West Point, New York to the British, assisting which general during the American Revolutionary War, who fought for the American Continental Army, and later defected to the British Army?
Sentence (from "Benedict Arnold"): This plan was exposed in September 1780.
Relevant evidence: No