(1):
(n.) A body of troops; esp. a body of troops or an army in battle array.
(2):
(n.) A regiment, or two or more companies of a regiment, esp. when assembled for drill or battle.
(3):
(v. t.) To form into battalions.
(4):
(n.) An infantry command of two or more companies, which is the tactical unit of the infantry, or the smallest command which is self-supporting upon the battlefield, and also the unit in which the strength of the infantry of an army is expressed.