The structure of the fort underwent substantial changes around this time. The casemates, which were now vulnerable to the more powerful artillery that had been developed since they were built, were covered almost up to roof level by an earthen glacis. Their interiors were also partly infilled with rubble, as was the defensive ditch in front of the casemates, providing additional protection against enemy fire as it helped to camouflage the structure. Two light quick-firing guns with ammunition lockers were installed on the fort's roof to guard against small, fast-moving threats such as torpedo boats. The rest of the fort remained intact but was now used as a barracks for the wing batteries. Three of the truncated casemates were converted into married quarters, one became officers' quarters and the final three were used by the men. An additional set of detached quarters for a Warrant Officer and a small detachment of Royal Engineers was constructed to the south-east of the fort, along with barrack stores.