Reva, South Dakota Reva, South Dakota Reva is an unincorporated community in Harding County, South Dakota, United States. Although not tracked by the Census Bureau, Reva has been assigned the ZIP code of 57651. The community has the name of Reva Bonniwell, the daughter of a first settler. The Battle of Slim Buttes occurred here on September 9–10, 1876, in the Great Sioux Reservation between the United States Army and Miniconjou Sioux during the Great Sioux War of 1876. It marked the first significant victory for the Army since the stunning defeat of General George Custer at the Battle of Little Bighorn in
Battle of the Little Bighorn Territory: "…a horse or a mule for a repeater…buffalo hides for ammunition." Custer's highly regarded guide, "Lonesome" Charley Reynolds, informed his superior in early 1876 that Sitting Bull's forces were amassing weapons, including numerous Winchester repeating rifles and abundant ammunition. Of the guns owned by Lakota and Cheyenne fighters at the Little Bighorn, approximately 200 were repeating rifles corresponding to about 1 of 10 of the encampment's two thousand able-bodied fighters who participated in the battle The troops under Custer's command carried two regulation firearms authorized and issued by the U.S. Army in early 1876: the breech-loading, single-shot Springfield Model