As the Ottoman military became weak, the Citadel began to lose its military importance. In 1798 AD, during the French expedition of Egypt, it fell into the hands of the French troops, mainly because of the weakness of the Citadel garrison, and the power of the French modern weapons at that time. Inside, the French found some crusader weapons, which dated back to the campaign of Louis IX. These may have been spoils from the Battle of Al Mansurah.