A Brennan Torpedo station was added in 1890. This was a wire-guided torpedo used for harbour defence: the launching rails are still visible at low water. It was replaced around 1910 with quick firing guns. The fort was armed in World War I and was used as an anti-aircraft battery in World War II. It is now inside a gravel extraction site and is inaccessible and very overgrown. It can however be viewed from the riverside path.