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 such claims. Theodore Goldin, a battle participant who later became a controversial historian on the event, wrote (in regards to Charles Hayward's claim to have been with Custer and taken prisoner): The only documented and verified survivor of Custer's command (having been actually involved in Custer's part of the battle) was Captain Keogh's horse, Comanche. The wounded horse was discovered on the battlefield by General Terry's troops, and although other cavalry mounts survived they had been taken by the Indians. Comanche eventually was returned to the fort and became the regimental mascot. Several other badly wounded horses were found and