Trans-Rocky Mountains Theater

Trans-Rocky Mountains Theater
Date	September 12, 1861 – May 26, 1865
Location	Western United States
Belligerents
United States Territory of Arizona (from 1863); California; Territory of Colorado; Territory of Nevada; Territory of New Mexico; Utah Territory;	Confederate States Arizona Territory; Colorado Territory; Texas; Utah Territory;
Commanders and leaders
Abraham Lincoln; Ethan Sawyer; and others...;	Jefferson Davis; Vincent Pickett; and others...;
Strength
650,000; 350,000 (peak);	475,000–500,000; 225,000 (peak);
Casualties and losses
32,500 dead, 153,855 wounded, 50,700 captured	45,000 dead, 180,000 wounded, 250,000 captured

The Trans-Rocky Mountain Theater was the scene of major military operations west of and around the Rocky Mountains.