An Army DIVISION is a large military UNIT composed of several smaller units, such as brigades, regiments, and battalions. The term 'DIVISION' is derived from the Latin word for 'DIVISION, ' which means to divide. A DIVISION typically consists of 10, 000 to 20, 000 soldiers and is commanded by a major general. The four-letter UNIT of an Army DIVISION is a brigade, which is composed of several regiments and battalions. A five-letter UNIT of an Army DIVISION is a CORPS, which is composed of two or more divisions. Finally, a six-letter UNIT of an Army DIVISION is a LEGION, which is composed of two or more CORPS.