Question: Which battle resulted as a conflict between the United States Army and the Sioux and involved a Hunkpapa Lakota holy man who was killed by Indian agency police on the Standing Rock Indian Reservation?
Sentence (from "Sitting Bull"): He was killed by Indian agency police on the Standing Rock Indian Reservation during an attempt to arrest him, at a time when authorities feared that he would join the Ghost Dance movement.
Relevant evidence: Yes