In 1870s, in the Sioux territory south of the Missouri, trapper and Indian scout Luther Yellowstone Kelly is hired by the army at Fort Buford but runs into trouble with the Sioux.In 1870s, in the Sioux territory south of the Missouri, trapper and Indian scout Luther Yellowstone Kelly is hired by the army at Fort Buford but runs into trouble with the Sioux.In 1870s, in the Sioux territory south of the Missouri, trapper and Indian scout Luther Yellowstone Kelly is hired by the army at Fort Buford but runs into trouble with the Sioux.