Background
In 1879 the Ute Reservation covered most of western Colorado, land guaranteed to the Ute by an 1868 treaty for their "absolute and undisturbed use and occupation." Despite treaty terms requiring the U.S. government to prevent trespass, miners had encroached on the reservation through the 1870s with little enforcement action. Army presence near the reservation was minimal, with only two understrength troops of the 9th Cavalry stationed in Colorado by 1879, most of the regiment being engaged elsewhere in Victorio's War.
In 1878, Nathan Meeker was appointed U.S. Indian Agent at the White River Ute Reservation despite lacking experience with Native Americans. Meeker pursued policies aimed at converting the Ute to Christianity and forcing them into settled farming, contrary to their hunter-gatherer and migratory traditions. Tensions escalated after Meeker plowed land the Ute used for grazing and horse racing. Colorado Governor Frederick Walker Pitkin had campaigned on removing the Ute from the state, and local politicians and settlers made exaggerated claims against the tribe.
The Attacks
On September 29, 1879, following an assault on Meeker and his eviction from his home, Ute members attacked the White River Agency, killing Meeker and ten male employees: Frank Dresser, Henry Dresser, George Eaton, Wilmer E. Eskridge, Carl Goldstein, W.H. Post, Shaduck Price, Fred Shepard, Arthur L. Thompson, and Julius Moore. Five women and children, including Meeker's wife Arvilla and daughter Josephine, were taken hostage and held for 23 days before being released through negotiations aided by Chief Ouray, his wife Chipeta, and a Ute woman named Shawsheen and her husband.
Simultaneously, Ute warriors led by Chief Colorow ambushed Major Thomas T. Thornburgh's column of roughly 178 soldiers and militiamen at Milk Creek, killing Thornburgh and 13 soldiers and wounding 28. Troops held a defensive position for several days until reinforced by Buffalo Soldiers of the 9th Cavalry on October 2, and were relieved by a larger column under Colonel Wesley Merritt on October 5, by which time the Ute had dispersed. Eleven soldiers, including Sergeant Henry Johnson and Captain Francis Dodge, were later awarded the Medal of Honor.
Aftermath
Secretary of the Interior Carl Schurz halted military action pending the hostages' release, secured by former agent Charles Adams. Peace negotiations began in November 1879, and in 1880 Congress enacted the Ute Removal Act, forcing the White River Utes to the Uintah Reservation in Utah and later also forcing the Uncompahgre Utes from Colorado, denying the tribe roughly 12 million acres of treaty land. Chief Jack, who had fled with White River Utes back to Colorado, was killed by soldiers on April 28, 1882, while resisting return to the Uintah Reservation, marking the effective end of the conflict.