Diary entries on daily life, the weather, and battles in which he participated; also includes a photograph (photostatic copy). Typewritten copy of a diary (1861-64) kept while he was serving in the 4th Michigan Infantry as sergeant and lieutenant. Most of the entries are short and terse. The chief items of interest concern his service with Professor Thaddeus Sobieski Constantine Lowe (an American Civil War aeronaut who pioneered military aerial reconnaissance) and his balloon. Also includes Bancrofts reflections on the following battles: Gaines' Mill, Malvern Hill, Fredericksburg, Chancellorsville, and Gettysburg. There is an outline of what a day in camp is like; descriptions of marches-the countryside, fatigue, the weather, food or lack of it, and campsites. He tells about foraging for food and for building materials, and describes his quarters. He speaks of General McClellan and President Lincoln; of his reading, and of his bouts with dysentery and the remedies prescribed. He was mustered out in June of 1864. The original of the diary is in the Auburn University Special Collections and Archives, Alabama.