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 break back to the south where Reno and Benteen could have provided assistance. Two men from the 7th Cavalry, the young Crow scout "Ashishishe" (known in English as Curley) and the trooper Peter Thompson, claimed to have seen Custer engage the Indians. The accuracy of their recollections remains controversial; accounts by battle participants and assessments by historians almost universally discredit Thompson's claim. Archaeological evidence and reassessment of Indian testimony has led to a new interpretation of the battle. In the 1920s, battlefield investigators discovered hundreds of .45–55 shell cases along the ridge line known today as Nye-Cartwright Ridge, between South