Take out the Troop Ships with a single keel shot aimed halfway between the stern and the main deck structure (cabin or whatever you want to call it). The ship will wallow and sink by the stern usually in less than 5 minutes. If the torpedo hits too close to the midpoint, the ship will go dead and sit low in the water but not sink. If this happens, make your distance around 3500 meters and you can finish off the troop ship with the deck gun and be reasonably safe from return fire. Only when the seas are rough will a shot to the midpoint blow up a troop ship (at least this has been my experience).
scrapser
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