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.