The Legion was primarily formed in reaction to multiple defeats in the Ohio country in 1790 and 1791, and to assert U.S. sovereignty over U.S. borders in the western territories and Great Lakes regions. The Legion was composed of four sub-legions, each with its own infantry, cavalry, riflemen and artillery. The Legion is best known for its victory at the Battle of Fallen Timbers in August 1794. Following the 1795 Treaty of Greenville with the Western Confederacy of Native American nations and the Jay Treaty with Great Britain, the Legion was reduced in size and rechristened the Army of the United States in 1796.