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to sink to move aside. The design of submarines, to resist the enormous pressure of the water at depth, made them also resistant to the effects of underwater explosions; a depth charge of the Second World War had to explode within about 26 feet of its target to have any serious effect.
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The barrage was expensive in terms of resources and could quickly empty an escort's magazine, so it could only be used in stubborn cases. The practice of equipping convoy ships with reserves of depth charges to re-arm escorts when necessary went some way to alleviate this problem.
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over the target area; at the word of command each ship would lay a series of depth charge patterns, one after the other, in a carpet. The cumulative effect of the explosions, sometimes up to 80 in one attack, would have a devastating effect on their target.
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that had gone deep, and was using the time taken by the attacking escort's
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The barrage attack was a measure devised by Walker to deal with a
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after being developed by the Group's commanding officer, Captain
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