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 the American Civil War, with both Union and Confederate troops utilizing knives, eating utensils, mess plates and pans to dig effective battlefield fortifications. Despite hearing heavy gunfire from the north, including distinct volleys at 4:20 pm, Benteen concentrated on reinforcing Reno's badly wounded and hard-pressed detachment rather than continuing on toward Custer's position. Benteen's apparent reluctance to reach Custer prompted later criticism that he had failed to follow orders. Around 5:00 pm, Capt. Thomas Weir and Company D moved out to make contact with Custer. They advanced a mile, to what is today Weir Ridge or Weir Point, and could