Indian Wars: in Nebraska, 700 soldiers under United States General William S. Harney avenge the Grattan Massacre by attacking a Sioux village and killing 100 between men, women and children.

Indian Wars: whilst protecting a railroad survey party in Montana, the United States 7th Cavalry, under Lieutenant Colonel George Armstrong Custer clashes for the first time with the Sioux near the Tongue River; only one man on each side is killed.

Indian Wars: Sioux Chief Sitting Bull leads the last of his fugitive people in surrender to United States troops at Fort Buford, North Dakota