IV Corps (ACW)

IV Corps
IV Corps badge
Active	March 13, 1862 – August 1, 1863 October 10, 1863 – August 1, 1865
Type	Army Corps
Size	Corps
Part of	Army of the Potomac
Engagements	American Civil War
Insignia
1st Division
2nd Division
3rd Division

There were two corps of the Union Army called IV Corps during the American Civil War. They were separate units, one serving with the Army of the Potomac and the Department of Virginia in the Eastern Theater, 1862–1863, the other with the Army of the Cumberland in the Western Theater, 1863–1865.

The IV Corps, Army of the Potomac, was created on March 13, 1862, and placed under the command of Erasmus D. Keyes, who had commanded a brigade at First Bull Run. It consisted initially of three divisions, under Darius N. Couch, Silas Casey, and William F. “Baldy” Smith. Couch's division was transferred to join VI Corps during the Antietam Campaign and remained with them for the duration of the war. The corps' peak strength (in early 1862) was 37,000 men.

The corps took part in George B. McClellan's Peninsula Campaign of 1862, playing a major role in repulsing Confederate attacks at Seven Pines and Malvern Hill. After the campaign, IV Corps remained on the Peninsula, with Couch's division later detached. The corps was attached to the Department of Virginia under John A. Dix, and took part (along with VII Corps) in minor diversionary actions against Richmond during the Gettysburg Campaign. The corps was officially discontinued on August 1, 1863. Elements of IV Corps were later absorbed into XVIII Corps.

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