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 Indian reservations. The Battle of the Little Bighorn was the subject of an 1879 U.S. Army Court of Inquiry in Chicago, held at Reno's request, during which his conduct was scrutinized. Some testimony by non-Army officers suggested that he was drunk and a coward. The court found Reno's conduct to be without fault. After the battle, Thomas Rosser, James O'Kelly, and others continued to question the conduct of Reno due to his hastily ordered retreat. Defenders of Reno at the trial noted that, while the retreat was disorganized, Reno did not withdraw from his position until it became apparent that