There is some statistical data in Eberhard Rössler's "Geschichte des deutschen U-Bootbaus" on the lethality of british ASW weapons for 1943, 1944 and 1945, Squid included.
1st half 1943
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DC attacks - 554
DC successfull attacks - 27,5
Percentage - 5%
Hedgehog attacks - 53
Hedgehog successfull attacks - 4,5
Percentage - 8,5%
2nd half 1943
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DC attacks - 401
DC successfull attacks - 15
Percentage - 3,7%
Hedgehog attacks - 49
Hedgehog successfull attacks - 4
Percentage - 8,2%
1st half 1944
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DC attacks - 404
DC successfull attacks - 30
Percentage - 6,5%
Hedgehog attacks - 70
Hedgehog successfull attacks - 10
Percentage - 14,3%
Squid attacks - 3
Squid successfull attacks - 0
Percentage - 0%
2nd half 1944
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DC attacks - 98
DC successfull atacks - 5,5
Percentage - 5,6%
Hedgehog attacks - 37
Hedgehog successfull attacks - 13
Percentage - 35,1%
Squid attacks - 23
Squid successfull attacks - 6,5
Percentage - 28,3
1.-5. 1945
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DC attacks - 107
DC successfull attacks - 7,5
Percentage - 7%
Hedgehog attacks - 59
Hedgehog successfull attacks - 15,5
Percentage - 26,3%
Squid attacks - 24
Squid successfull attacks - 10,5
Percentage - 43,8%
The british Squid mortar consisted of 3 forward launching tubes capable of a throwing range of 550m for the MK VI DC. The MK VI had a 91kg Amatol II filler with a lethal radius of 6,4m against U-Boats. Max. depth setting was 350m, sinking rate 13,4 m/sec, fuze either timer or water pressure.
Principle of function: In the selected depth, the 3 DC's formed a triangle with a side length of circa 36m. A U-Boat positioned within the triangle was usually lost.
Squids were mounted on Frigattes of the Loch- and on Corvettes of the Castle class. The first Squid success against a U-Boat was attributed to the Frigatte "Loch Killin" against U-333 on 31.07.44. The same Frigatte sank U-736 with a Squid attack on 06.08.44.
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