@ossobuco,
I don't remember the full story. There was some sort of Indian raid in Colorado, and a Coronel Chivvington let some sort of Colorado militia in search of retribution. He found some Indians and got the retribution. What he couldn't get by killing, he achieved by mutilating the bodies. It wouldn't have been quite such a setback for race relations if he had chanced upon the right band. Sorry for the lack of precision. Maybe you should try wilki, or just ask Bob. I think he might have been there.
This was the same Coronel Chivvington that led one side in the battle of Glorietta Pass, the only Civil War battle fought in New Mexico. I have forgotten which side he was on, but I think he was of the Northern persuasion. I also don't know who won. Glorietta Pass is a bit north of Sante Fe, I believe.