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This weapon use in World war 2
WIki

The Hedgehog (also known as an Anti-Submarine Projector) was a forward-throwing anti-submarine weapon that was used primarily during the Second World War. The device, which was developed by the Royal Navy, fired up to 24 spigot mortars ahead of a ship when attacking a U-boat.[2] It was deployed on convoy escort warships such as destroyers and corvettes to supplement the depth charges.

Used by
Royal Navy
United States Navy
United States Coast Guard
Royal Canadian Navy

Production history
Designer
Directorate of Miscellaneous Weapons

Development
Designed
1941[1]
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