Little Bighorn, river, c.90 mi (145 km) long, rising in the Bighorn Mts., N Wyo., and flowing north to join the Bighorn River in S Mont. On June 25–26, 1876, Sioux and Cheyenne warriors defeated the forces of Col. George Custer in the Little Bighorn valley. The Little Bighorn Battlefield National Monument. (formerly Custer Battlefield National Monument) occupies the site of the battle. The graves of those killed in the battle are located around a granite monument marking the spot of Custer's “last stand.” See National Parks and Monuments (table).
