Planning a raid. The Indians; in their impressive typical costumes; come together in extremely picturesque groups. This is a troop from Sioux Ogalala (Oglala); on a hill overlooking the Wounded Knee Valley in the Pine Ridge Reserve; South Dakota. Photo taken from volume 3 of Edward S. Curtis's encyclopedia (1868-1952) on North American Indians; with a foreword by Theodore Roosevelt. Between 1907 and 1930; 20 volumes were published.