These gaps are termed embrasures, also known as crenels or crenelles, and a wall or building with them is described as crenellated; alternative older terms are castellated and embattled.
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In this wall were gaps or spaces called crenels, which were usually square or rectangular and placed at regular intervals. They're the distinct two- to three-foot-wide gaps you see at the very top of castle walls. Sometimes crenels are also called embrasures.
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.
Arrow slits, also known as loopholes, were narrow openings in castle walls that allowed archers to shoot arrows at attackers while remaining protected behind the walls. These openings were designed to be very narrow, which made it difficult for attackers to shoot back, and also provided protection for the archers.
A bailey is the sturdy wall around a castle that keeps invaders out. The bailey of a medieval castle was usually built of stone. You might see a bailey — or the remains of one — if you tour a castle in England or France.
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 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.
Castle Battlements and ParapetsThe raised sections of the battlement were known as merlons and the lower parts were called crenels. Crenels, sometimes called embrasures, were regularly spaced gaps in the castle battlement. Castle defenders could take protection behind the merlons and fire arrows from the crenels.
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.
A gatehouse is a type of fortified gateway, an entry control point building, enclosing or accompanying a gateway for a town, religious house, castle, manor house, or other fortification building of importance.