 Between 1860 and 1874 outworks were added.By now, within the ramparts, the Citadel contained barracks, stores and magazines arrayed around a large parade ground.The bomb-proof Officers' Quarters and Mess, built by Major William Jervois in 1860, was designed in part to be able to function as a defensible keep in the event of the Citadel being stormed by the enemy.