army, ground forces, regular army - a permanent organization of the military land forces of a nation or state

force, military force, military group, military unit - a unit that is part of some military service; "he sent Caesar a force of six thousand men"

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"

corps - an army unit usually consisting of two or more divisions

division - an army unit large enough to sustain combat; "two infantry divisions were held in reserve"

battle group - an army unit usually consisting of five companies

regiment - army unit smaller than a division

brigade - army unit smaller than a division

battalion - an army unit usually consisting of a headquarters and three or more companies

company - small military unit; usually two or three platoons

platoon - a military unit that is a subdivision of a company; usually has a headquarters and two or more squads; usually commanded by a lieutenant

detachment - a small unit of troops of special composition

vanguard, van - the leading units moving at the head of an army

section - a small army unit usually having a special function

squad - a smallest army unit

troop - a group of soldiers

troop - a cavalry unit corresponding to an infantry company

artillery unit, artillery - an army unit that uses big guns

musketry - musketeers and their muskets collectively

cavalry - a highly mobile army unit

infantry, foot - an army unit consisting of soldiers who fight on foot; "there came ten thousand horsemen and as many fully-armed foot"

military personnel, soldiery, troops - soldiers collectively