First American standing army, formed after the Revolutionary war, for the express purpose of waging war on Native Americans and their confederacies. Called "Legion of the United States" and built on Roman legionary model.
5,120 total strength. Composed of four sub-legions, each commanded by a lieutenant colonel. Sub-legions were self-contained units with two battalions of infantry, a rifle battalion (light infantry skirmishers armed with Pennsylvania long rifles to screen the infantry), a troop of dragoons and a battery of artillery.
A response to St. Clair's defeat and the inadequacy of State Militias.