Try and get past the escorts... let them go by you. Once inside the convoy reek havoc on the most valuable ships. Change directions but keep after them. If they are half way past you turn and follow, and attack from the rear. They're zig zagging and you'll be able to get a broadside shot at them.
Now, if you are attacked... if one that isn't sinking very fast and hide under it. You will be safe and able to leave when they get tired of looking and leave. Remember their course. You can surface once they're out of sight and to an end run around to get back ahead of them again. Sometimes it works and sometimes it doesn't. If you find them and are ahead of them, hit em again.
