Cavalier

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A cavalier is a fortification which is built within a larger fortification, and which is higher than the rest of the work. It usually consists of a raised platform within a fort or bastion, so as to be able to fire over the main parapet without interfering with the fire of the latter.

Excerpt from the Wikipedia article “Cavalier (fortification)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ludwig Dupas, CC BY-SA 4.0, via Wikimedia Commons.