Notes on the Use of Machine Guns in Trench Warfare and On The Training of Machine Gun Units Compiled from Foreign Reports. 50 pages, illus. Published by the US Army War College as a classified document in March 1917, just weeks before American entry into World War One. This book was designed to bring the Army up to speed with the developments in machine gun doctrine that had evolved rapidly over the first war years in Europe. Includes guidance on training, emplacements, night firing, indirect fire, much more.