Contains two diaries that A.T. Henson wrote during his service in the Canadian military during World War I in Europe. The first diary covers September 7, 1917, to February 28, 1918, and the second covers March 1, 1918, to July 12, 1918. Also contains one World War I photograph album, including photographs, letters, and printed ephemera that Henson created and compiled to document his military service overseas. These materials are dated from 1915 to 1919.