It was reoccupied by the military for the first time in over 400 years, with British and Canadian troops garrisoning it from May 1940, and Americans later. The towers of the inner bailey were converted into troop accommodation by lining the walls with bricks and laying wooden floors.
After being vacant for over four hundred years, the site was taken back by the military in May 1940. British and Canadian troops occupied it, followed by Americans. The inner bailey's towers were converted into barracks by lining their walls with bricks and laying wooden floors.