I have to admit I was getting a little cocky after my first patrol. During my second patrol, the first ship I encountered was an unescorted merchant tanker. Or so I thought! Since it was very early morning, I resorted to my usually successful tactic of surfacing close by and taking her down with the deck gun. Imagine my surprise when this "merchant" ship starts opening firing on me!
Despite my surprise, I was able to react quickly and submerge. Got away with only a little damage to my radio equipment, which was quickly repaired.
Very nice!