 However, thanks to the influence of his father, he was appointed as attaché to the cabinet of the prefect of Hérault under the presidency of Raymond Poincaré.Mobilised on 17 April 1918, Moulin was assigned to the 2nd Regiment of Engineering, based in Metz after the victory.After an accelerated training, he arrived in the Vosges at Charmes on 20 September and was preparing to go to the front lines when the armistice was proclaimed.