Division
The divisional armies fluctuated in size, but usually comprised one to five brigades. Brigades comprised about 2,500 men commanded by a brigadier (one star) general. Congress approved 73 generals, 16 of whom had been officers in the British army (usually captains or majors), 36 in the colonial militias, and 21 with zero previous military experience. All that Nathanael Greene and Henry Knox knew about warfare came from reading manuals and military history, yet Greene was one of the two or three best fighters (after Benedict Arnold), and young Knox (born 1750) brilliantly handled Washington's artillery. http://en.citizendium.org/wiki/American_Revolution,_military_history