Defensible Barracks, Pembroke Dock

The Defensible Barracks at Pembroke Dock, is a Grade II*-listed, Victorian-era fortification and barracks in Pembrokeshire, Wales. It is a 20-sided stone fort surrounded by a dry moat with masonry walls. A parade ground occupies the centre of the fort. It was built in the mid-1840s to house the Royal Marines based in Pembroke Dockyard and to protect the dockyard.

History
The barracks was built in 1841–46 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. Prior to the Defensible Barracks' construction, the Royal Marines were housed in the hulked 74-gun ship, HMS Dragon (1798), that had been deliberately run aground in 1832.

Description
The barracks is in the form of a square bastion trace with four two-storey, barracks ranges surrounding the central parade ground. "The enclosed yard remains notable for being the finest Georgian-style square in Wales". A fortified gatehouse is in the middle of the north wall. The moat is about 16 ft deep and 42 ft 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.