How effective were U-boats during WWII?
I was browsing through the internet and looking for info on U-boats. What I got from my search was, as much Allied tonnage sunk that were attributed to U-boats, it only represented 1% of Allied shipping where the U-boats operated. Is this true?
I just always thought that the amount of sunk tonnage was more significant than that. Forgive me for not providing a link to the site where I saw this info. from. History buffs, can someone please clarify?
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