 He also served in the First World War, initially as a Brigade Major for 3rd Infantry Brigade which formed part of the British Expeditionary Force deployed to France in 1914.He was a General Staff Officer in various formations before becoming temporary Commander of 1st Infantry Brigade in 1917.In 1918 he was assigned to General Headquarters of the French Army, as a liaison officer between General Sir Henry Wilson, Chief of the Imperial General Staff and French Marshal Ferdinand Foch.