December 39....take your shots, 2 eels per ship and 1 with the stern tube, onl;y use impact pistols, magnetics are too unreliable...if you're in the middle try not to shoot at the closest ships but the ones one row removed then drift out the back by going deep and silent, surface as soon as you feel its safe to do so, catch up with the convoy again while reloading your torpedos and begin another attack run... if you time it well you can do 3 attacks in one night...
if the weather is bad, say high winds, you might get away with reloading at periscope depth and doing a second attack right away, but that's a bit risky
