Cadmus Marcellus Wilcox | |
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| Nickname(s) | Billy Fixin' |
| Born | May 20, 1824 Wayne County, North Carolina, U.S. |
| Died | December 2, 1890 (aged 66) Washington, D.C., U.S. |
| Place of burial | Oak Hill Cemetery Washington, D.C., U.S. |
| Allegiance |  United States Confederate States of America |
| Service |  United States Army Confederate States Army |
| Years of service | 1846–1861 (USA) 1861–1865 (CSA) |
| Rank |  Captain (USA) Major General (CSA) |
| Commands | 9th Alabama Infantry Regiment Wilcox's Brigade Wilcox's Division |
| Battles / wars | Mexican–American War American Civil War |
| Relations | John A. Wilcox (brother) |
| Other work | author |
| Signature |  |
Cadmus Marcellus Wilcox (May 20, 1824 – December 2, 1890) was a career United States Army officer who served in the Mexican–American War and also was a Confederate general during the American Civil War.