Hudson’s Bastion, which is located on the north eastern side of Dover Castles outer defences, was constructed in the 1790’s as part of a major phase of redevelopment of the castle. It is one of four bastions constructed in this area during this period and was designed to take advantage of the salient angle and to provide flanking fire between Horseshoe and East Demi-Bastions. Access to Hudson’s bastion was provided by Hudson’s Passage, a long tunnel extending beneath the ramparts and connecting the inner part of the castle with the east ditch. (location accurate to the nearest 1m based on available information)