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Old 01-23-15, 01:58 AM   #2
TorpX
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I recently went through the statistics in the back of Roscoe's US Submarine Operations of WWII, and while I never totaled the torpedo and ship numbers, your figures tell the same story.

For instance, I divided the number of merchant ships sunk by the number of attacks made. The best monthly figure was 51%, and most were a good deal less than that. In fact in a lot of months the average was no more than 25%.
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