Trans-Mississippi Department
| Trans-Mississippi Department | |
|---|---|
| Active | 1862–1865 |
| Disbanded | May 26, 1865 |
| Country | Confederate States |
| Branch | Army |
| Type | Territorial department |
| Headquarters |
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| Wars |
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The Trans-Mississippi Department was a territorial department of the Confederate States Army that embraced Arkansas, Louisiana west of the Mississippi river, Texas (including what is now New Mexico and Arizona), and the Indian Territory. It was the last department to surrender to Federal forces at the end of the American Civil War.