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 around June 26 or 27 in an attempt to engulf the Native Americans. On June 22, Terry ordered the 7th Cavalry, composed of 31 officers and 566 enlisted men under Custer, to begin a reconnaissance in force and pursuit along the Rosebud, with the prerogative to "depart" from orders if Custer saw "sufficient reason". Custer had been offered the use of Gatling guns but declined, believing they would slow his command. While the Terry–Gibbon column was marching toward the mouth of the Little Bighorn, on the evening of June 24, Custer's Indian scouts arrived at an overlook known as the