Hmm.. Okay, so, it was a crew issue then. Although caused by my nubbery.
Guess I need to spend some more renown points back at port then. Don't recall seeing a qualified torpedoman amongst the PO's on my first round, but it wouldn't be anything new under the sun that I missed something. This is all still so confuzzling to me. Well, now I know better than to rush out to sea before making sure I actually have a crew that can do something.
Too bad I didn't get the tonnage from the one merchant I managed to sink in my patrol grid for some reason.
About the fatigue system.. What does the '!' next to a person indicate? Critical fatigue, or something along those lines?