You need to be in front of the convoy and submerged, silent running to have any chance at all. You will need to come in at an angle of about 45deg to the convoy path to try to slip between the lead and first wing escorts.
Do a search and you'll find plenty of info on how to set up an attack.
You could also do yourself a big favour and read the U-Boat Commanders Handbook which explains a lot about the doctrine and attack tactics.
|