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 Indians" last stand" in the area. Within 48 hours of the battle, the large encampment on the Little Bighorn broke up into smaller groups because there was not enough game and grass to sustain a large congregation of people and horses. Oglala Sioux Black Elk recounted the exodus this way: "We fled all night, following the Greasy Grass. My two younger brothers and I rode in a pony-drag, and my mother put some young pups in with us. They were always trying to crawl out and I was always putting them back in, so I didn't sleep much." The scattered