A battlement Gules with three merlons and two embrasures. These arches formed casemates which afforded a lower tier of fire through embrasures. Double ramparts have massive circular bastions at intervals, with battlements, embrasures, machicolations and string courses. The casemates were then filled in and embrasures closed. Room features include balconies, fireplaces, dumbwaiter shafts, secret stairwells, bay windows, embrasures, and turrets. There are embrasures especially in fortified castles and bunkers. The smaller guns included twenty QF Hotchkiss guns in hull embrasures and on the superstructure. The roof has seven gun embrasures and a lookout turret. Small bunkers with thick walls were set up with three embrasures towards the front. Merlons are sometimes pierced by narrow, vertical embrasures or slits designed for observation and fire. These included twenty 50-calibre Canet QF guns mounted in hull embrasures. The remaining guns were mounted in hull embrasures. There are two entrances with openings in the same direction as the embrasures. There are also embrasures and windows suitable for archers. It was unusual in having no embrasures for cannon in the main fort.