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 an expedition of this size, and part of the officer shortage was chronic, due to the Army's rigid seniority system: three of the regiment's 12 captains were permanently detached, and two had never served a day with the 7th since their appointment in July 1866. Three second lieutenant vacancies (in E, H, and L Companies) were also unfilled. The Army's coordination and planning began to go awry on June 17, 1876, when Crook's column retreated after the Battle of the Rosebud, just to the southeast of the eventual Little Bighorn battlefield. Surprised and according to some accounts astonished by the