Whats with the aft tubes?

[SteamWake]

I have tried unsuccessfully to attack pursuing destroyers from astern and from the bow. Typically using a beneath the keel shot with zero success.

The DD usually veers out of the torpedos path or the torpedo fails to detonate.

In fact the only DD's I have claimed never new what hit them.

But the stern tubes are usefull they just take a little more planning to set up a shot.