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 on the Plains", published just two years before the Battle of the Little Bighorn, he asserted: Indians contemplating a battle, either offensive or defensive, are always anxious to have their women and children removed from all danger…For this reason I decided to locate our [military] camp as close as convenient to [Chief Black Kettle's Cheyenne] village, knowing that the close proximity of their women and children, and their necessary exposure in case of conflict, would operate as a powerful argument in favor of peace, when the question of peace or war came to be discussed. On Custer's decision to advance