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I seem to remember hearing that I'd the U-boats had been able to sink 750,000 tons of shipping per month, for 24 months, Britain would be forced to surrender.

Is this accurate? I haven't found figures for the amount of allied shpiping at the start of the war, or numbers for allied shupping production, so I really don't know.

How much shipping would Britain need to stay in the fight?

Thanks in advance for any help.
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