On 3 March 1915, he became Chief of Staff of the Seventh Army.
On 3 December 1915, he became commander of the 43rd Infantry Division, on 16 October 1916 of the 5th Army Corps and on 4 May 1917 of the Seventh Army.
In the last weeks of the war, he received command of the French Army in Belgium with which he fought the Battle of the Lys and the Escaut.
After the War, he commanded the Second Army between 27 November 1918 and 11 February 1919.