A battlement is the upper walled part of a castle or fortress.
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The notches themselves are called crenels or embrasures, and the process of installing them is crenellating. The word stems from the Latin cren (also the root of cranny), which means notch. Definitions of crenellate. verb. supply with battlements.
A parapet fortification (known as a breastwork when temporary) is a wall of stone, wood or earth on the outer edge of a defensive wall or trench, which shelters the defenders. In medieval castles, they were often crenellated.
Dongjon or keep - The inner stronghold of a castle, usually found in one of the towers. Drawbridge - A heavy timber platform built to span a moat between a gate house and surrounding land that could be raised when required to block an entrance.
Hoardings. Wooden structures added to the top of walls and towers to provide a covered walkway and a secure place for defensive fire. Sometimes they could be removed during peacetime.
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.
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.