This primary source comes from the Records of the Office of the Chief Signal Officer.
National Archives Identifier:
530896Full Citation: Sitting Bull (Tatonka-I-Yatanka), a Hunkpapa Sioux; 1885; Records of the Office of the Chief Signal Officer, Record Group 111. [Online Version, https://www.docsteach.org/documents/document/sitting-bull-tatonkaiyatanka-a-hunkpapa-sioux, April 17, 2024]