War in the Colorado Territory of native Cheyenne and Arapaho tribes against white settlers and militia
The Colorado War and the Sand Creek Massacre led to congressional and military investigations that shaped U.S. Indian policy debates in the late 19th century.
Key Facts
- Years of conflict
- 1864–1865
- Key massacre
- Sand Creek Massacre, November 1864
- Colorado militia unit
- 1st Colorado Cavalry Regiment
- Primary theater
- Colorado Eastern Plains, Kansas, Nebraska
- Condemned commander
- Col. John M. Chivington
By the Numbers
Location
Cause → Event → Consequence
Tensions between white settlers expanding into Colorado Territory and the Southern Cheyenne, Arapaho, and allied Lakota Sioux escalated into open conflict in 1864. Competition over land, raids, and retaliatory violence by both sides, combined with aggressive actions by Colorado militia forces, drove the outbreak of sustained warfare across the Eastern Plains and along major overland routes.
The Colorado War of 1864–1865 saw U.S. Army forces and Colorado militia clash with Southern Cheyenne, Arapaho, Brulé and Oglala Lakota, and, to a lesser degree, Kiowa and Comanche fighters. The conflict's most infamous episode was the November 1864 Sand Creek Massacre, in which Colonel John Chivington's Colorado Volunteers attacked Chief Black Kettle's winter camp, killing many Cheyenne civilians and warriors.
The Sand Creek Massacre triggered military and congressional hearings that found Chivington culpable for genocidal brutality. Surviving Cheyenne and Arapaho moved northward to join the Northern Cheyenne, Northern Arapaho, and Lakota, conducting raids along the South Platte River en route. The massacre intensified broader conflicts and contributed to growing national debate over U.S. treatment of Native peoples.
Belligerents & Mobilization Analysis
Side A
3 belligerents
John M. Chivington.
Side B
3 belligerents
Black Kettle.