welcome back Raven_2012

I find your post most interesting as any thing to do with the deck gun fascinates me. I regard the u-boat as essentially a
gun boat with torpedo backup; 50% of the sunk ships should be sunk with the gun to save eels and all eel targets then
finished off with the gun. Naturally single ships, not convoys, are the preferred target with this doctrine. Dead astern at 3000 meters at night if possible is the optimal distance and least problematic if the merchant turns out to be armed, especially the Liberty ships with naval gun crews fore and aft..