A set of 12 casemated musket rooms, connected by a gallery, are situated behind the western face of the Detached Bastion at the Western Heights. The first nine casemates have two horizontal loops each, looking straight out into the west ditch, while the last three casemates have three vertical loops each. The eighth casemate gives access to the terreplein and the last one to the first floors of the north-west caponier and west gallery via a ramp. The southern end is accessed via the South caponier. (location accurate to the nearest 1m based on available information)