Who led the attack that became known as the Sand Creek Massacre?

The Sand Creek massacre (also known as the Chivington the Chivington massacre, the Battle of Sand Creek or the massacre of Cheyenne Indians) was a massacre in the American Indian Wars that occurred on November 29, 1864, when a 675-man force of Colorado U. S. Volunteer Cavalry attacked and destroyed a village of Cheyenne and Arapaho in