Hi everyone!
I make a small card game for pc/ios/android.
You are commander of german sub in operations at the sea in WW2.
I want make a realistic historical background and reading some books about U-boot, but I need some help. If you are interested in, continue reading:

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Game has Special Target Cards, and this card - is objective for submarine patrol. For exapmle - for patrol in septermber and october 1940 - special target is HMS Corages.
nov,dec 1939 - Royal Oak
jan,feb, 1940 - Nelson
mar,apr 1940 - Thistle
may, jun 40 - there is no particular target, so target - Convoy
jul,aug 40 - Cadillac
sep,oct 40 - there is no particular target, so target - Convoy (HX-72)
nov,dec 40 - there is no particular target, so target - Convoy (SC-7)
jan,feb 41 - there is no particular target, so target - Convoy (SC-26)
mar,apr 41 - Terje Viken
may,jun 41 - HMS Renown (Arc Royal class)
jul,aug 41- there is no particular target, so target - Convoy (SC-42)
sep,oct 41 - Malaya (Queen Elith. class)
nov, dec 41 - HMS Dunedin
jan,feb 42 - tanker Norness
mar,apr 42 - tanker Muskogee
may,jun 42 - there is no particular target, so target - Convoy
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If you know what I can add or replace in this list, please advice... If you have any question - feel free to asking me.