The Fetterman Fight, also known as the Fetterman Massacre or Battle of the Hundred Slain, was a battle during Red Cloud's War on December 21, 1866, between the Lakota, Cheyenne, and Arapaho Indians and soldiers of the United States Army. All 81 men under the command of Captain William J. Fetterman were killed by the Indians. At the time, it was the worst military disaster ever suffered by the U.S. Army on the Great Plains. The battle led to an Indian victory, with the U.S. forces withdrawing from the area.