Just be carefull so you dont waste to long time on a mission if you have reached its goal.
There is some more difficult missions where you have to sink 5 ships and also 1 carrier. Problem is , its a pain to find that carrier and it might require a few time consuming missions to do so.
I was never able to find it and lost 3 germany star points and failed the overall mission. I also enterd the norway campaign mission to late so i never found a single prey there even if i was in the time limit. And another 3 stars lost.
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