The idea of the cutie was to disable/sink an escort by popping the engine shaft seals. This is where the propeller shaft comes out of the hull. If you destroy the screw or rudder, its as good as a kill for everything but the tonnage. Its no longer a danger to you.
Even today in ASW warfare, a "stern" shot is best. Hitting a target and popping the shaft seals will kill a sub, whereas some of the larger subs (typhoon for instance) are so large that a hit elsewhere will most likely allow the sub to survive.
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Good Hunting!
Captain Haplo
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