I was thinking (yeah, I do that sometimes) whether attacking a convoy is better or going after single ones. I concluded in my feeble mind that going for the lone ship is better. I was studying the common denominator of animal hunters and they often go for weak, easy victims. Why should subs be any different? Going after convoys is a risky business as we all know. If it's merely recon that's ok. But evading a DD screen is hard and the outcome dubious at best. Or maybe not so dubious as you may very likely be dead. So on patrol I found that the lone merchant ship is almost a surety with a deck gun (in TM at least) or torp. Bloody call me anti-social, but parties ain't my thing.