Ok, so I'm ordered to a grid with a few "target ships" that i think i can sink as a test for my shakdown cruise. On destroying a few ships with british flags and after the 24 hour patrol time i head for home. I get damaged without any reason while just going on my merry way repair the damage and think it's just a malfunction (I think part of SH3 Commanders options). I start to suspect something is wrong when a friendly coastal battery opens fire on me causing heavy damage and i must stay submerged crawling/scraping along the sea bed back to port, on arrival i surface and all nearby ships open fire on me totally destroying me.
What did I do wrong? At the end it listed 8 Neutral ships sunk.
