Photograph of the Joshua Hett Smith House, Treason Hill, West Haverstraw, New York. American General Benedict Arnold met with British Major John André at the house on September 22, 1780, while planning the treasonous surrender of the fort at West Point, New York. The house later served as General George Washington's Headquarters, August 20 to 25, 1781. It was demolished circa 1922, and is now the site of the Helen Hayes Hospital.