États-Unis dans la Première Guerre mondiale
From 1909 to 1916, he was with the War Department General Staff and was promoted to colonel and appointed Deputy Chief of Staff of the American Expeditionary Forces in 1917, following the entry of the United States in World War I. In July 1918, he was promoted brigadier general, and given command of the 63rd Brigade, 32nd Infantry Division. At the Battle of Château-Thierry, he was awarded a second Silver Star.