General Patrick Conner's Powder River Expedition was designed to punish Plains tribes for attacks on emigrant trains and communications. Accordingly, U.S. troops, along with Winnebago and Pawnee scouts, attacked the large Arapaho village of Chief Black Bear in present-day Sheridan County, Wyoming. The attackers routed the defenders and scattered the 500 Arapaho there. Five soldiers and around sixty Arapaho were killed. (By John Osborne)