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The Sand Creek Massacre was an atrocity in the Indian Wars that occurred on November 29, 1864, when a 700-man force of Colorado Territory militia attacked and destroyed a peaceful village of Cheyenne and Arapaho encamped in southeastern Colorado Territory, killing and mutilating an estimated 70–163 Indians, 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. 

Answer:

Sand Creek Massacre, also called Chivington Massacre, (November 29, 1864), controversial surprise attack upon a camp of Cheyenneand Arapaho people in southeastern Colorado Territory by a force of about 675 U.S. troops, mostly Colorado volunteers, under Col. John M. Chivington.

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