Also I wonder how did Allied merchants knew where Allied's mines were? Didn't some Germans captured some merchants, boarded on ships, had access to bridges looking for maps or manuals revealing where British laid their mines at? It should go to intelligent report, useful information for kaleuns. It must be Bernard who was an administrator in department of counter-intelligence agency. I know escorts at ports usually carry that kind of information to lead other ships in/out of ports, but I am talking about mines laid across North Sea and English Channel.
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