| XXI Corps | |
|---|---|
 XXI Corps headquarters badge | |
| Active | 1862–1863 |
| Type | Army Corps |
| Size | Corps |
| Engagements | American Civil War |
| Commanders | |
| Notable commanders | Thomas L. Crittenden |
| Insignia | |
| 1st Division |  |
| 2nd Division |  |
| 3rd Division |  |
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.
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Formations of the Union Army | ||
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| Independent Departments |
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| Middle Military Division |
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| Military Division of the Mississippi |
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| Military Division<br/>of West<br/>Mississippi |
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| Field Armies |
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| Army Corps |
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This page was last edited on 12 December 2023, at 23:22