I have happened upon them a few times. They are just swell because the DD will go after them while I go get the tonnage. Here is how I did it in a nutshell. Flanked to the rear of convoy. Got their attention. DD came after me like gangbusters. I Flanked backed to the wolves. The wolves used their cannons and to pretty good effect also. Whilst they were busy with them, I flanked the convoy and had me way with them. Three DD went down because of the wolves. All but one wolf was destroyed. It was this patrol that I really felt like a wolfpack