I've just completed my fourth patrol. For doing so I was promoted to Oberleutnant zur see, got the Iron cross first class and the u-boat clasp after sinking nearly 85k tons of warship (Hood and a very lucky shot on Nelson that missed my intended target), with sufficient merchants to take my tonnage to about 115k.
However:
At the very start of the patrol I saved my game after transiting the Kiel canal, then exited the game with return to base instead of using save and exit. Obviously I reloaded the save to continue the patrol another time, but for my heroic navigation of an inland waterway I was awarded with the promotion and the Iron Cross, first class.
I think this proves that the game just makes it up as it goes along!
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