The Fetterman Fight, also known as the Fetterman Massacre or the Battle of the Hundred-in-the-Hands or the Battle of a Hundred Slain, was a battle during Red Cloud's War on December 21, 1866, between a confederation of the Lakota, Cheyenne, and Arapaho tribes and a detachment of the United States Army, based at Fort Phil Kearny, Wyoming. Wikipedia