I'd go for a keel shot, it should be no problem unless the sea is rough. 1 spread of 2 torps on each battleship. If it were just the one battleship I would probably fire 2 and see if they hit the target then fire my other 2.
In reality batteships were fairly well protected against impact detonation on the side by the armor belt and multiple compartments and bulkheads, so keel shots are the way to go.
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O/B U-69, 2nd Flotilla
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