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Originally Posted by harzfeld
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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Afaik no german u-boat commander ever was aboard a merchant. German Aux.-cruisers seized many ships but allied crews often had the time to destroy secret material. I donīt want to know how many bags with that stuff were marking the convoy routes...
Position of minefields were often captured via radio messages. The german B-Dienst (Beobachtungsdienst / naval intelligence) was very good in the first years.