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 Crow's Nest, east of the Little Bighorn River. At sunrise on June 25, Custer's scouts reported they could see a massive pony herd and signs of the Native American village roughly in the distance. After a night's march, the tired officer who was sent with the scouts could see neither, and when Custer joined them, he was also unable to make the sighting. Custer's scouts also spotted the regimental cooking fires that could be seen from away, disclosing the regiment's position. Custer contemplated a surprise attack against the encampment the following morning of June 26, but he then received a