Command History
| Alpheus S. Williams | September 12, 1862 – September 15, 1862 |
| Joseph K. Mansfield | September 15, 1862 – September 17, 1862 |
| Alpheus S. Williams | September 17, 1862 – October 20, 1862 |
| Henry W. Slocum | October 20, 1862 – July 1, 1863 |
| Alpheus S. Williams | July 1, 1863 – July 4, 1863 |
| Henry W. Slocum | July 4, 1863 – August 31, 1863 |
| Alpheus S. Williams | August 31, 1863 – September 13, 1863 |
| Henry W. Slocum | September 13, 1863 – September 25, 1863 |
| * Henry W. Slocum | September 25, 1863 – April 18, 1864 |
* Corps assigned to the Army of the Cumberland; other entries assigned to the Army of the Potomac
After April 18, 1864, the divisions of the XII Corps became part of the XX Corps.
Read more about this topic: XII Corps (Union Army)
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