| Army: A military formation composed of
at least two corps and other attached units. Northern armies were named
after rivers while Confederate armies were named for geographic areas.
Battalion: A tactical military unit typically consisting
of a headquarters company and four infantry companies or a headquarters
battery and four artillery batteries.
Battery: The basic tactical artillery unit, corresponding
to the company in the infantry.
Brigade: A former unit of the U.S. Army existing during
the Civil War that was composed of two or more regiments commanded by
a brigadier general. During the Civil War the average brigade was four
to eight regiments.
Company: A subdivision of a regiment or battalion, the
lowest administrative unit, usually under the command of a captain. Usually
consists of approximately one hundred officers and men.
Corps: A tactical unit of ground combat forces (infantry)
between a division and an army commanded by a lieutenant general and composed
of two or more divisions and auxiliary service troops (cavalry and artillery).
Division: An administrative and tactical military unit
that is smaller than a corps but is self-contained and equipped for prolonged
combat activity. Federal divisions usually contained three brigades, while
Confederate divisions numbered up to six brigades. Major generals or brigadier-generals
commanded divisions.
Muster In/Out: The formal procedure of swearing recruits
into or out of government service.
Regiment: A military unit of ground troops consisting
of at least two battalions. Ten companies comprised an infantry regiment.
A colonel was the field commander of a regiment.
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