 He completed his training and embarked for France, where he joined 3rd Anti-Aircraft Battalion during the air defense of Paris.Bradshaw was later transferred to the 2nd Anti-Aircraft Battalion and participated in the Meuse–Argonne offensive in fall 1918.Following the Armistice, Bradshaw participated in the occupation of the Rhineland until mid-1919, when he was ordered to England and entered a post-graduate course at the University of Oxford.