March's company took part in every major engagement in which American troops were involved, incurring heavy casualties. As a member of the 5th Marines, March saw his first action on the old Verdun battlefield near Les Éparges and shortly afterwards at Belleau Wood, where he was wounded in the head and shoulder. He returned to the front in time for the offensive at the battles of Soissons and Saint-Mihiel. March was twice promoted and had attained the rank of sergeant when he was assigned to French troops in the Blanc Mont area, on "statistical duties".