Convoy Sighted,now what?

[andym]

Ok,i am asking what to do here.I am on Patrol off the west coast of Portugal and get a miriad of reports,ship spotted etc,etc,take a gander through the attack scope and ive stumbled across a large slow convoy.Theres Freighters,Troopships,Tankers ....................and 2x Black Swan Class Destroyer and 3 possibly 4 flower class corvettes.So i shadow the convoy at PD silent run ning and on of the flowers comes over to investigate,after a few DC's which are all miles off i decide that discretion is the better part of valour and resume my ploted course.I complete the patrol of the required area and sink a few freighters then decide to try and catch up the Convoy.My question is this,do close the convoy then fore a spread of fish in the hope it hits something or do i pick off the escorts(doesnt sound like a good idea to me)?Any input greatfully recieved.