SIOUX WARRIOR, 1891. /nTasunka Ota (Plenty Horses), an Oglala Sioux warrior who, after having attended the Carlisle Indian School in Pennsylvania, fatally shot Lieutenant Edward W. Casey of the U.S. Army in January 1891, posing beside a cannon with two U.S. soldiers at a military camp near Pine Ridge, South Dakota. Photographed by John C.H. Grabill, 1891.