revetted shelter trench

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Trench warfare — is a form of warfare where both combatants have fortified positions and fighting lines are static. Trench warfare arose when a revolution in firepower was not matched by similar advances in mobility. The result was a slow and grueling form of… … Wikipedia
fortification — /fawr teuh fi kay sheuhn/, n. 1. the act of fortifying or strengthening. 2. something that fortifies or protects. 3. the art or science of constructing defensive military works. 4. Often, fortifications. military works constructed for the purpose … Universalium
British hardened field defences of World War II — Hexagonal pillbox (type 22) British hardened field defences of World War II were small fortified structures constructed as a part of British anti invasion preparations. They were popularly known as pillboxes by reference to their shape.[1] Con … Wikipedia

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