A postern is a secondary door or gate in a fortification such as a city wall or castle curtain wall. Posterns were often located in a concealed location which allowed the occupants to come and go inconspicuously.
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Article Talk. A chemin de ronde (French, round path' or patrol path; French pronunciation: [??m?~ d? ??~d]), also called an allure, alure or, more prosaically, a wall-walk, is a raised protected walkway behind a castle battlement.
A portcullis is a latticed grille or gate made of wood, metal or a combination of the two. Portcullises fortified the entrances to many medieval castles, acting as a last line of defence during time of attack or siege.
Batter (Plinth) The angled lower part of a tower or wall. Missiles dropped from the top of the towers or wall onto the plinth cause them to richochet horizontally into the attackers doing more damage. Plinths also strengthened the bases of the towers or walls and also made it harder to undermine them.
moat, a depression surrounding a castle, city wall, or other fortification, usually but not always filled with water. The existence of a moat was a natural result of early methods of fortification by earthworks, for the ditch produced by the removal of earth to form a rampart made a valuable part of the defense system.
In architecture, the talus is a feature of some late medieval castles, especially prevalent in crusader constructions. It consists of a battered (sloping) face at the base of a fortified wall.
In architecture, a turret is a small tower that projects vertically from the wall of a building such as a medieval castle. Turrets were used to provide a projecting defensive position allowing covering fire to the adjacent wall in the days of military fortification.
In fortification architecture, a bank or rampart is a length of embankment or wall forming part of the defensive boundary of a castle, hillfort, settlement or other fortified site. It is usually broad-topped and made of excavated earth and/or masonry.