U.S. settlers were alarmed by the sight of the many Great Basin and Plains tribes performing the Ghost Dance, worried that it might be a prelude to armed attack. Among them was the U.S. Indian agent at the Standing Rock Agency where Chief Sitting Bull lived. U.S. officials decided to take some of the chiefs into custody in order to quell what they called the "Messiah craze". The military first hoped to have Buffalo Bill—a friend of Sitting Bull—aid in the plan, to reduce the chance of violence. Standing Rock agent James McLaughlin overrode the military and sent the Indian police to arrest Sitting Bull.