moat, a depression surrounding a castle, city wall, or other fortification, usually but not always filled with water.
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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.
Bailey (Ward)The courtyard of a castle containing the principal buildings, including sometimes a tower keep, which may be surrounded by its own fortified wall. Medieval Ballista.
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.
In medieval castles, the area surrounded by a curtain wall, with or without towers, is known as the bailey. The outermost walls with their integrated bastions and wall towers together make up the enceinte or main defensive line enclosing the site.
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.
It turns out that those fairy tales you read as a child all left out a very important truth: The moats that surrounded medieval castles weren't just useful defenses against attack; they were also open sewers into which the castles' primitive waste disposal systems flushed human excrement and other foul substances.
In a medieval castle, a garderobe was usually a simple hole discharging to the outside into a cesspit (akin to a pit latrine) or the moat (like a fish pond toilet), depending on the structure of the building.
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.