A body of troops; esp. a body of troops or an army in battle array.
A regiment, or two or more companies of a regiment, esp. when assembled for drill or battle.
To form into battalions.
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.
Marching thus at night, a battalion is doubly impressive. The silent monster is full of restrained power; resolute in its onward sweep, impervious to danger, it looks a menacing engine of destruction, steady to its goal, and certain of its mission. Patrick MacGill
The day after the prison was transferred to the military intelligence command, they had an entire battalion - 1,200, 1,500 soldiers - arrive at Abu Ghraib just for force protection alone. Janis Karpinski
In the World War nothing was more dreadful to witness than a chain of men starting with a battalion commander and ending with an army commander sitting in telephone boxes, improvised or actual, talking, talking, talking, in place of leading, leading, leading. J. F. C. Fuller