After assuming various commands, he taught applied artillery tactics at the École supérieure de guerre (War College) in 1897. In 1914, retired, he returned to service and commanded the 70th division, then was successively entrusted with the 6th, 4th and the 1st Army during 1916. On May 1, 1917, General Fayolle united under his authority the group of armies of the Center. At its head, it plays a decisive role in the Allied victory. On November 16, 1917, he was Commander-in-Chief of French troops in Italy. After the armistice, he joined the Supreme War Council in 1920. Inspector General of Aeronautics, he was Marshal of France in 1921