Walmer Castle is the most southerly of the three Henrian coastal forts which protected the Downs, that sheltered strait lying between the coast and the Goodwin Sands. It stands a mile from Deal Castle, to which it was originally connected by earthworks, and was built at the same time.
Though resembling Deal in principle, it is simpler in design. It consists of a squat cylindrical tower closely surrounded by a lower curtain, the latter projecting outwards in four semi-circular lobes to form a quatrefoil plan. It was a plan shared by Sandown Castle, the northern member of the group and now almost totally destroyed.
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