In the spring of 1876, more and more Plains Indians left their reservations to join Crazy Horse in his campaign to drive the U.S. Army out of the Black Hills region of South Dakota. They overwhelmed General Crook's forces at the battle of the Rosebud and then made their camp along the Greasy Grass River (known to the army as Little Bighorn) in southern Montana. The number of Warriors swelled to almost two thousand, from six different tribes: Oglala, Minneconjou, Sans Arc, Blackfoot, and northern Cheyenne. On June 25, General George A. Custer brought his force of over two hundred soldiers down into the valley, where he found about three times as many Sioux warriors as he had expected. He and his entire unit were killed in the battle. Pictured above are two vies of the battle: an Indian drawing by Red Horse, a Minneconjou Sioux, and an illustration which appeared in Harper's Weekly.