Call me crazy but in that situation I certainly would get in front of that convoy and shut everything down, running silent so your within say 700metres (just keep your scope down and follow with sonar, you wont be detected with all the other noise around you), set your solution from the map first with a good spread so your hitting the front of the vessel and then aiming for the munitions in the rear third of the ship. Then pop your parascope up when the Nelson is @ 353-355 degrees and fire when shes around 358 (i seem to get better contact detonations like this). Those two torpedoes should take her to the locker... Next (this is where I deviate from most of the other Calhouns here) I surface the boat and hit full flank with 3 men on the deck gun and one watch officer so I can get accurate ranging information. Id your escorts and try to keep the other larger merchants between you and them. Remember your accelerating quickly and take this into account as well. Pummel them with the deck gun and save your torpedoes while running out ahead of the convoy... after you've sank the escorts, you can as they say behave like a "wolf in a chicken coup".
