Defensible Barracks, Pembroke Dock

The barracks was built between 1841 and 1846 to house the dockyard's garrison of Royal Marines and to cover the landward side of the dockyard from an infantry assault. It was probably the last trace bastion fort built in Europe.[1] Prior to the Defensible Barracks' construction, the Royal Marines were housed in the hulked 74-gun ship, HMS Dragon, that had been deliberately run aground in 1832.[2]

The barracks was acquired by a private developer, with plans to convert it into residential accommodation, in September 2019.[3]

The barracks is in the form of a square bastion trace with four two-storey, barracks ranges surrounding the central parade ground.[1] "The enclosed yard remains notable for being the finest Georgian-style square in Wales".[4] A fortified gatehouse is in the middle of the north wall. The moat is about 16 feet (4.9 m) deep and 42 feet (12.8 m) wide and is crossed by a fixed modern steel bridge that replaced the original wooden sliding drawbridge that leads to the gatehouse. The scarp or inner wall of the moat rises above the height of the platform to serve as a parapet with musketry loopholes, except at the salient angles of the bastions to allow the guns mounted on the bastions' platform to fire over the parapet. All but the southwestern bastion still have some gun mountings remaining. The external walls of the gatehouse and the barracks ranges are also loopholed, although some of these have been fitted with sash windows.[1]

• Phillips, Lawrie; Lieutenant Commander (2014). Pembroke Dockyard and the Old Navy: A Bicentennial History. Stroud, Gloucestershire, UK: The History Press. ISBN 978-0-7509-5214-9.