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Thank you for your question! Typically in the early stages of the Civil War, a regiment consisted of 10 companies, each with around 100 men. This structure originates from the Hardee Manual in 1855. Now companies could vary in size, leading to different regiment sizes. Your graphic above represents the typical size of regiments during the Civil War from both the Union and Confederate armies.
Thank you for using the History Hub and good luck with your research!
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Thanks, Thomas--that fills in the gaps.