army unit - a military unit that is part of an army

armed forces, armed services, military, military machine, war machine - the military forces of a nation; "their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker"

personnel, force - group of people willing to obey orders; "a public force is necessary to give security to the rights of citizens"

cavalry, horse cavalry, horse - troops trained to fight on horseback; "500 horse led the attack"

garrison - the troops who maintain and guard a fortified place