In 1939, the 107th Infantry Regiment, under the command of lieutenant-colonel Laffont, was integrated into the 23rd Infantry Division. On August 24, 1939, the 107th left the barracks Gaspard-Michel for Lorraine where it participated in one of the few offensive actions of the "Phoney War", that of Sare. The 107th RI embarked on the Somme and the Crozat Canal where from 18 to 30 May 1940, the Germans are content, but after the fall of Dunkirk and the resumption of the Wehrmacht on the Somme, the regiment was forced to retreat on June 7 order, first on the Oise and the Marne, where it continued to fight. Under pressure from the enemy, it found itself in Châteauroux where, having retained its cohesion, it is organized to defend the city. The armistice with Germany was signed, and the regiment was once again dissolved, this time on 21 August 1940.