A representation of the massacre of American prisoners in Dartmoor Prison on April 6th, 1815. Colour engraving of Dartmoor Prison in Devon, England, where American prisoners of war captured by British forces, especially at sea, were confined, even after the Treaty of Ghent was signed in Dec. 1814. Angered at being left behind, prisoners burned U.S. agent Reuben G. Beasley in effigy, which led to a confrontation with prison guards and a reduction of rations. Fearful of insubordination, guards shot the prisoners, killing 7 and wounding 31.