Hospital battery, which was located towards the centre of the castle’s cliff-edge boundary, was constructed in 1874 as part of of a major re-armament of Dover Castle. It is one of four new batteries constructed within the castle at this time, the others being East Demi Bastion, Shoulder of Mutton Battery and Shot Yard Battery. The battery comprised three U-shaped gun pits, each for a single 10 inch RML gun, constructed from brick and concrete and with magazines located beneath and between the pits. In the early 20th-century a Fire Command Post and then a Port War Signal Station were constructed over the obsolete battery. (location accurate to the nearest 1m based on available information)