In the First World War he served in base hospitals in Italy. During September 1918, he was sent to France for temporary duty with several American units, and with the British Expeditionary Force, during the Meuse–Argonne offensive and the Battle of Saint-Mihiel, he was attached to the B.E.S General Hospital No. 12 in Rouen. From October to November 1918 he was Commanding Officer of the American Army Field Hospitals with the 3rd, 4th, and 8th Italian Armies during the Battle of Vittorio Veneto.