Regiments and Batteries of the Union Army in the Eastern Theater

The Union Army in the Civil War was primarily made up of regiments of infantry and cavalry and batteries of artillery. With the exception of a small number of units from the Regular Army, most were created by the individual states and taken into national service.

Of the nineteen free states, all but Iowa, Kansas, California and Oregon sent one or more regiments to the Eastern Theater, although the majority of the men from Ohio west fought elsewhere.

Of the slave states that remained in the Union, Missouri and Kentucky sent no troops to the east. Maryland sent units to both armies. Delaware sent several thousand men to the Union army and was the only slave state that provided no organized units to the Confederacy.

West Virginia was part of Virginia until the war. But it was strongly pro-Union and broke away to become an independent state in 1863.

Select any state to the right to see information on its individual regiments and batteries.

*Only states whcih contributed to the Eastern Theater are shown in the table, but contributions of men and units are for all theaters.