Some of the fort's armament was removed under the terms of the 25 June 1940 armistice, but the "ouvrage" was maintained by French forces through the war, albeit in a militarily decommissioned capacity. l"Agaisen was occupied by German forces after their withdrawal from the war in 1943, remaining until the allied invasion of Southern France in 1944. The Germans fired on advancing American forces with the 75mm turret in October, abandoning the position on October 28, 1944 after sabotaging some of the equipment. The American 442nd Infantry Regiment, composed of mostly Japanese-American soldiers, occupied the site in November 1944. During fighting around Authion in April 1945 the 75mm turrets of l'Agaisen and Monte Grosso were used in support of American and French forces in the area. An abundance of French 75mm ammunition, incompatible with American 76mm guns, encouraged the reconditioning and used of the turret guns.