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. Two new 9.2-inch guns were installed in 1906 in the western wing battery. They were mounted on barbettes, enabling them to recoil along their axis and so delivering a much faster rate of fire. One 9.2-inch and one 6-inch gun on a disappearing mounting remained in the eastern wing battery before being removed in 1907. During the war the fort was used as a Battery Command Post operating in conjunction with a Port War Signal Station located to the fort's east, which was responsible for monitoring all shipping entering or leaving the Thames. The remaining two 9.2-inch guns were removed in 1917 and reinstalled at Fletcher Battery, a newly built position on the Isle of Sheppey. The Army discontinued the use of the fort in 1920 and in 1929 it was sold off and converted into a small zoo. It saw one further period of military usage during and immediately before the Second World War; it was used as an observation post from 1938, became part of the local anti-invasion system in 1939–40 and was used as part of the air defence network against V-1 flying bombs in 1944. After the war it belonged to the Allhallows Estate Company before passing to Strood Rural District Council. Plans were advanced to demolish it but the cost proved prohibitive. It was instead converted into a riding stables in the early 1960s. Current status Slough Fort is well-preserved and