Spotted Tail was a Sichangu Lakota tribal chief. Famed as a great warrior since his youth, warring on Ute, Pawnee and Absaroke, and having taken a leading part in the Grattan Massacre, he led his warriors in the Colorado and Platte River uprising after the massacre performed by John M. Chivington's Colorado Volunteers on the peaceful Cheyenne and Arapaho camping on Sand Creek,... Wikipedia