He was sent to France, where he was "promoted to sergeant, put in charge of camouflage research, and served at the front in the Second Battle of the Marne, Château-Thierry, Belleau Wood, and on the Hindenberg Line. He received a severe back wound which troubled him for the rest of his life" (Culkin 1980).
He was awarded the Army Distinguished Service Medal for meritorious and distinguished service for his work as a surgeon and director of surgical teams at the front during the Second Battle of the Marne, the Battle of Saint-Mihiel, and the Meuse-Argonne Offensive.
Battle of Reims (1918), between Germany and the allied forces during World War I.
He was salvage officer with the 2nd Infantry Division and was engaged in the Second Battle of the Marne, the Battle of Saint-Mihiel and the Meuse-Argonne Offensive.
Major Walker commanded the battalion of his regiment during the Second Battle of the Marne in the summer of 1918 and distinguished himself during the heavy combats.
Irwin distinguished himself during the Second Battle of the Marne, Oise-Aisne Offensive and Meuse-Argonne Offensive and received the Army Distinguished Service Medal.
He participated in the Battle of Château-Thierry, Second Battle of the Marne, and Meuse-Argonne Offensive.
Subsequently participated in the Battle of Château-Thierry, Aisne-Marne Offensive and Meuse-Argonne Offensive.
At the Second Battle of the Marne, under conditions that rendered other officers in charge useless, he took charge of the 2d Battalion of the 10th Field Artillery Regiment and kept the battalion effective until the tide of Germans was turned back.
The new and highly effective Renault FT tanks were introduced on the battlefield for the first time.
During the Battle of Marne, the 32nd Division captured Fismes, and during August their successful capture of Juvigny earned it the nickname "Le Terribles".
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