Hedgehog
Weapon
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The Hedgehog 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. Wikipedia
Barrels: 24
Designed: 1941
Detonation mechanism: Contact
Effective firing range: 200–259 m (656–850 ft)
In service: 1942 to ?
Place of origin: United Kingdom
Shell: 65 lb (29 kg)