Initial Rock, also known as Name Rock, in the Dakota Prairie Grasslands, Little Missouri National Grasslands, Medora Ranger District near Medora, North Dakota, was listed on the National Register of Historic Places (NRHP) in 1976. It was the site of an overnight camp on May 28, 1876 of George Armstrong Custer's men, on their way to the Battle of Little Big Horn, which happened on June 25, 1876. The NRHP listing included one contributing site and one contributing object on 9.9 acres (4.0 ha).[2]