On Lake Erie, the American commander Captain Oliver Hazard Perry fought the Battle of Lake Erie on September 10, 1813. His decisive victory against the British ensured American control of the lake, improved American morale after a series of defeats, and compelled the British to fall back from Detroit. General Harrison launched another invasion of Upper Canada (Ontario), which culminated in the U.S. victory at the Battle of the Thames on October 5, 1813. Tecumseh was killed there, and his death effectively ended the North American indigenous alliance with the British in the Detroit region. American control of Lake Erie meant the British could no longer provide essential military supplies to their aboriginal allies, who dropped out of the war. The Americans controlled the area during the remainder of the conflict.