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 see in the distance native warriors on horseback shooting at objects on the ground. By this time, roughly 5:25 pm, Custer's battle may have concluded. The conventional historical understanding is that what Weir witnessed was most likely warriors killing the wounded soldiers and shooting at dead bodies on the "Last Stand Hill" at the northern end of the Custer battlefield. Some contemporary historians have suggested that what Weir witnessed was a fight on what is now called Calhoun Hill. The destruction of Keogh's battalion may have begun with the collapse of L, I and C Company (half of it) following