not historically accurate of course
It is true that German blockade runners were escorted by U-boats. As far as I know, however, such escort was only possible close to Biscay. And unlike what is shown in the film, U-boat escort was never effective. At least four blockade runners were lost in 1942-43 despite it-Germania, Rhatkotis, Hohenfriedburg and Regensburg. U-boats only did harm, by sinking the inbound Doggerbank.
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