Outwork

Rarity: Common

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Science and technology

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What Wikipedia says

An outwork is a minor fortification built or established outside the principal fortification limits, detached or semidetached. Outworks such as ravelins, lunettes (demilunes), flèches and caponiers to shield bastions and fortification curtains from direct battery were developed in the 16th century.

Excerpt from the Wikipedia article “Outwork”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: User Ohto Kokko on fi.wikipedia, cropped by User:Bryan Derksen, CC BY-SA 3.0, via Wikimedia Commons.