Pile barrages, among other names (see § Terminology), are underwater barricades or barrages used for coastal military defence. They are constructed with piles, vertical poles or stakes driven into the bed of a body of water, extending up to, or above, the water line to block the passage of watercraft.
Pile barrages, among other names (see § Terminology), are underwater barricades or barrages used for coastal military defence. They are constructed with piles, vertical poles or stakes driven into the bed of a body of water, extending up to, or above, the water line to block the passage of watercraft.
Source: Wikipedia "Pile barrage" · CC BY-SA 4.0
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