The east Demi Bastion is located at the south-eastern edge of the castle, on the cliff edge and forms part of the comprehensive remodelling of the castle’s eastern defences undertaken in the 1790’scentury for artillery warfare. Underground passages were also constructed here to allow direct access to East Demi-Bastion from behind the main rampart. The bastion was remodelled in the 19th century (between 1871 and 1874) during which time large gun emplacements were added and a large underground magazine was constructed. (location accurate to the nearest 1m based on availbale information)