The term Main Army had come into use during the Siege of Boston, because the majority of Continental Army regiments were assigned to it. The term was retained throughout the war. Most units in the Middle Department were assigned to the Main Army, under George Washington, or to the Highlands Department, which was under Washington's close supervision. A few regiments and independent companies were assigned to the Middle Department from time to time, but were not assigned to Washington's army or to the Highlands. These units were simply said to have been assigned to the Middle Department.