In October 1859, Brown led a raid on the federal armory at Harpers Ferry, Virginia (today West Virginia), intending to start a slave liberation movement that would spread south; he had prepared a Provisional Constitution for the revised, slavery-free United States he hoped to bring about. He seized the armory, but seven people were killed, and ten or more were injured. Brown intended to arm slaves with weapons from the armory, but only a few slaves joined his revolt. Those of Brown's men who had not fled were killed or captured by local militia and U.S. Marines, the latter led by Robert E. Lee. Brown was hastily tried for treason against the Commonwealth of Virginia, the murder of five men, and inciting a slave insurrection. He was found guilty of all counts and was hanged on December 2, 1859, the first person executed for treason in the history of the United States.