This primary source comes from the Records of the Office of the Chief of Engineers.
National Archives Identifier:
305690Full Citation: Sketch [map] of Fort Donelson and Out Works. . . by Lt. W. L. B. Jenney, V. Engrs., [and] Lt. W. Kossack; 2/28/1862; Records of the Office of the Chief of Engineers, Record Group 77. [Online Version, https://www.docsteach.org/documents/document/sketch-[map]-of-fort-donelson-and-out-works-by-lt-w-l-b-jenney-v-engrs-[and]-lt-w-kossack, May 9, 2024]