[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.

[1] "The enclosed yard remains notable for being the finest Georgian-style square in Wales".

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.

The external walls of the gatehouse and the barracks ranges are also loopholed, although some of these have been fitted with sash windows.