Pillbox (military)

A pillbox is a type of blockhouse, or concrete dug-in guard-post, often camouflaged, normally equipped with loopholes through which defenders can fire weapons. It is in effect a trench firing step, hardened to protect against small-arms fire and grenades, and raised to improve the field of fire.

The modern concrete pillbox originated on the Western Front of World War I, in the German Army in 1916.

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