An army unit is a group of soldiers organized for a specific purpose. A BRIGADE is the largest unit, consisting of three to five regiments. A REGIMENT is a military unit composed of several battalions. A CORPS is a large military unit composed of two or more divisions. A DIVISION is a large military unit composed of two or more brigades. A SQUAD is a small military unit composed of four to ten soldiers. A BATTALION is a military unit composed of several companies. CAVALRY is a type of military unit that uses horses for transportation. A TROOP is a military unit composed of two or more platoons. A PLATOON is a military unit composed of two or more squads. An ANT is a small military unit composed of one soldier. INFANTRY is a type of military unit that fights on foot.