= 100 men, or, a
Company
Led by a colonel and known by number and state.
= 1,000 men, or, a Regiment. Each
regiment is led by a colonel.
= 5,000 men, or a Brigade.
Each brigade is led by a brigadier general.
= 15,000 men, or a Division. Each
division is led by a major general.
= 45,000 men, or a Corps. Each
corps is led by a major general (Union side),
10 Companies (1,000 men) Make Up a Regiment.
At the
beginning of the War, Grant was the colonel of the 21st Illinois Volunteer
Infantry (Governor Yates's Hellions).
5 Regiments (5,000 men) Make Up a Brigade.
Led
by a Brigadier General. Grant was promoted to Brigadier General of
Volunteers in August of 1861.
3 Brigades (15,000 men) Make Up a Division.
Grant was promoted to major general of volunteers in February of 1862
followed by a promotion to major general in the regular army after his
victory at Vicksburg in July of 1863.
3 Divisions (45,000 men) Make Up a Corps.
A
Corps
is led by a major general.
Two or three corps
formed an Army. Grant, in 1864, was placed in charge of all the Union
armies and promoted to lieutenant
general by President Lincoln. Union
armies were usually named after rivers. Grant
refused to command all the Union armies from a desk in Washington and
took up his headquarters with the
Army of the Potomac. His most
trusted general, William Tecumseh Sherman, was in charge of
the Army of the Tennessee.
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