An arrowslit (often also referred to as an arrow loop, loophole or loop hole, and sometimes a balistraria) is a narrow vertical aperture in a fortification through which an archer can launch arrows or a crossbowman can launch bolts.
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Meurtriere: arrow loop, slit in battlement or wall to permit firing of arrows or for observation. Moat: a deep trench usually filled with water that surrounded a castle.
Battlements were defensive parapets along the tops of castles. Battlements consisted of alternating raised spaces called merlons and the lower spaces called crenels. Battlements were created from stone and were originally designed to help protect the castle from invading forces.
As the gate is always a vulnerable point of a castle, towers may be built near it to strengthen the defences at this point. In crusader castles, there is often a gate tower, with the gate passage leading through the base of the tower itself.
A portcullis is a heavy castle door or gate made of metal strips that form a grid. A castle guardian might lower the portcullis to protect the people inside from an invading army. It was common during medieval times for castles to be protected by a portcullis or two.
Introduction. Putlog holes (also referred to as putlock holes or putholes) are small gaps or recesses incorporated into the construction of a stone or brick wall. Their purpose is to support the short horizontal beams or round poles known as putlogs (or putlocks).
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, 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 medieval fortification, a bretèche or brattice is a small balcony with machicolations, usually built over a gate and sometimes in the corners of the fortress' wall, with the purpose of enabling defenders to shoot or throw objects at the attackers huddled under the wall.
An undercroft is traditionally a cellar or storage room, often brick-lined and vaulted, and used for storage in buildings since medieval times. In modern usage, an undercroft is generally a ground (street-level) area which is relatively open to the sides, but covered by the building above.
The spires are essentially just big spikes atop the turrets; they may have lighting rods, weather vanes, radio antennae, flags or other decorative features attached. Or they can be just big spikes - what makes them spires is that they are above the roof of the turrets and pointy.