About the Author: Ian Sumner is a prolific writer and researcher who specializes in local and military history. He has made a particular study of the French army and air force during the First World War, his many books on the subject including The French Army 1914-18, French Poilu 1914-18, First Battle of the Marne 1914, They Shall Not Pass: The French Army on the Western Front 1914-1918, Kings of the Air: French Aces and Airmen of the Great War and The French Army at Verdun.