Video: '1864 Sand Creek Massacre 13 minutes'

(Tuesday, November 29, 1864; during the Colorado War, part of the American Indian Wars, Sioux Wars, and American Civil War) — A Colorado militia killed at least 150 peaceful Cheyenne Indians today in the Sand Creek Massacre in present-day Kiowa County, Colorado.

A 675-man force of the Third Colorado Cavalry under the command of U.S. Volunteers Colonel John Chivington attacked and destroyed a village of Cheyenne and Arapaho people in southeastern Colorado Territory, killing and mutilating an estimated 70 to over 600 Native American people.

Video: 'Colorado Experience: Sand Creek Massacre'

Chivington claimed 500 to 600 warriors were killed. However, most sources estimate around 150 people were killed, about two-thirds of whom were women and children.

The location has been designated the Sand Creek Massacre National Historic Site and is administered by the National Park Service. The massacre is considered part of a series of events known as the Colorado Wars.