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Organization and Rank

  • Organization

  • Rank


  • Organization

    A Civil War army consisted of many small parts that were joined together in stair-step fashion to make larger units. There were six basic units of organization. The smallest was a company, which had around 100 men. The largest was an army, which could have many thousands of men.

    Company

    A company was the basic unit in a Civil War army.

    A company had approximately 100 men and was commanded by a captain.

    Companies were named with the letters A–K
    (J was not used because it looked too much like I.)


    Regiment

    A regiment usually contained ten companies.

    A regiment had approximately 1,000 men and was commanded by a colonel.

    If the unit had only four to eight companies, it was called a battalion rather than a regiment.


    Brigade

    A brigade contained an average of four regiments.

    A brigade had approximately 4,000 men and was commanded by a brigadier general.

    Union brigades were named with numbers, but Confederate brigades were often named after their current or former commanding officers.


    Division

    A division contained three to five brigades.

    A division had approximately 12,000 men and was commanded by a major general.

    Confederate divisions tended to contain more brigades than their Union counterparts. Confederate divisions often had twice as many men as Union divisions had.


    Corps

    A corps contained an average of three divisions.

    A corps had approximately 36,000 men and was commanded by a major general (Union) or a lieutenant general (Confederate).


    Army

    An army comprised from one to eight corps.

    An army was commanded by a general.

    The Union often named its armies after rivers or waterways, i.e., Army of the Potomac. The Confederacy named its armies after states or regions, i.e., Army of Northern Virginia.


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