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XXI Corps (Union army)

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For the XXI Corps of the United States Army during the 20th Century, see XXI Corps (United States).
XXI Corps
XXI Corps headquarters badge
Active1862–1863
TypeArmy Corps
SizeCorps
EngagementsAmerican Civil War
Commanders
Notable
commanders
Thomas L. Crittenden
Insignia
1st Division
2nd Division
3rd Division
Military unit

XXI Corps was a corps of the Union Army during the American Civil War. It served as part of William S. Rosecrans's Army of the Cumberland and was in existence from January 9 to October 1863.

After the Battle of Stone's River, General Rosecrans reorganized the "wings" of his army into three corps. The left wing, under Thomas L. Crittenden, became the XXI Corps.

Taking part in the Tullahoma Campaign, the XXI Corps was heavily engaged at Chickamauga on September 19–20, 1863, where it was nearly destroyed. It was Rosecrans' mistaken decision to pull Thomas Wood's division of this corps to support George Thomas's XIV Corps that resulted in General James Longstreet's breakthrough against the Union center. It should be added, though, that elements of XXI Corps, most notably William J. Palmer's division, aided Thomas in his successful rearguard action on Snodgrass Hill. Along with the remnants of XX Corps, the corps reorganized into IV Corps shortly after the battle.

External links

Formations of the Union army
Independent
departments
Middle Military
Division
Military Division
of the
Mississippi
Military Division
of West
Mississippi
Field armies
Army corps
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