I did haul off directly in front of her about 3 km and waited for the convoy to haul off a bit more and to get a bit darker. From that position her stern mounted gun should have been unable to bear on me. In that interval, a storm blew in so that when I did surface, I couldn't use the gun. I don't have an all weather guns mod installed as that is cheating. In any event, her gun did not open fire on me, which seems to indicate to me that the game accurately models arcs of fire. I submerged to see what would happen and lo and behold, she went under and I got credit for the sinking.
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