List of battles fought in Colorado
Name Date Location War Dead Belligerents
Sand Creek Massacre November 29 , 1864 near modern Eads Colorado War 187 United States of America vs Cheyenne & Arapaho
Battle of Julesburg January 7 , 1865 near modern Julesburg Colorado War 14 United States of America & civilian volunteers vs Cheyenne , Arapaho , & Lakota Sioux
American Ranch massacre January 14 , 1865 near modern Sterling Colorado War 10 United States of America vs Cheyenne & Sioux
Battle of Beecher Island September 17-19 , 1868 modern Yuma County Comanche Campaign 41 United States of America vs Arapaho , Cheyenne & Lakota Sioux
Battle of Summit Springs July 11 , 1869 near modern Sterling Comanche Campaign ~35 United States of America vs Arapaho , Cheyenne & Sioux
Meeker Massacre September 29 , 1879 White River Indian Agency , near modern Meeker 11 White River Ute vs United States civilians
Battle of Milk Creek September 29 - October 25 , 1879 near modern Meeker Ute Wars 32-50 White River Ute vs United States of America
Ludlow Massacre April 20 , 1914 Ludlow Coal Wars 23-29 Colorado Fuel and Iron Company & Colorado state police vs United Mine Workers of America
Battle of Walsenburg April 28-29 , 1914 Walsenburg Coal Wars 2+ United Mine Workers of America-aligned strikers vs Colorado National Guard
Columbine Mine massacre November 21 , 1927 Serene Coal Wars 6 Rocky Mountain Fuel Company , Colorado Mounted Rangers & Colorado National Guard vs United Mine Workers of America-aligned strikers
Battles
This list of battles fought in Colorado is an incomplete list of military and other armed confrontations that have occurred within the boundaries of the modern US State of Colorado since European contact. The region was part of the Viceroyalty of New Spain from 1535 to 1682, New France from 1682 to 1762, Kingdom of Spain from 1762 to 1800, French First Republic 1800 to 1803, and part of the United States of America 1803-present (boundaries were disputed by Spain). The southern portion of Colorado was considered by Spain as part of its northern territories. Large portions of Colorado were subsequently under the administrative control of Mexico from 1800 to 1835, and the Republic of Texas from 1836 to 1846. Full administrative control of Colorado was established on February 2, 1848 with the signing of the Treaty of Guadalupe Hidalgo which ended the Mexican-American War. The Plains Indian Wars directly affected the region during westward expansion.