Pile barrages,[1][2] among other names (see § Terminology), are underwater barricades or barrages for coastal defence, constructed out of piling, vertical poles or stakes driven into the bed of a waterway, up to, or above the water line, blocking watercraft from crossing over, negating passage.[3][4][5][6] Such have been used since pre-history to prevent enemy watercraft from entering waterways or harbors, etc, as to protect the sailing routes to trading posts and settlements.[7]
Pile barrages are sometimes also mixed with floating booms.[7]
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