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 Assistant Surgeon Henry R. Porter. News of the defeat arrived in the East as the U.S. was observing its centennial. The Army began to investigate, although its effectiveness was hampered by a concern for survivors, and the reputation of the officers. Custer's wife, Elisabeth Bacon Custer, in particular, guarded and promoted the ideal of him as the gallant hero, attacking any who cast an ill light on his reputation. The Battle of the Little Bighorn had far-reaching consequences for the Natives. It was the beginning of the end of the 'Indian' Wars and has even been referred to as "the