How fast are the going? If they're going slower than your max surface speed, wait until they are 8000-9000 meters away, surface, go to flank speed and try an end-around. If they're going faster than your surfaced flank speed, you're out of luck.
Me? Unless fate gives me a present and they're heading right for me, I don't bother trying to chase down small warships.
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“Never do anything you can't take back.”
—Rocky Russo
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