The Drop Redoubt was a key element of the Western Heights fortifications. The terreplein on the Dorp Redoubt fort is the level surface behind the parapet providing a platform for the artillery. The terreplein contains the remains of eleven emplacements for guns on traversing platforms, positioned at intervals around the northern half of the redoubt. In 1804 there were twelve terreplien guns arranged around the redoubt with a weighting towards the north (the southern side of the redoubt was covered by the batteries defending the harbour). Changes were made 1858-67, when the terreplein was reorganised to accommodate eleven 7-inchRBLguns on traversing carriages, once more concentrated to cover the land front. The parapet was heightened to 1.95m in yellow stock brick, embrasures were made through the rampart, and ready-use ammunition lockers were installed. Most of these arrangements survive. (location accurate to the nearest 1m based on available information)