[desirableroasted]

You really should not overestimate the ability of merchants to a) see T1 bubbles or b) evade them successfully when they do.

Escorts can and do, but a merchant has never seen my bubble trail in my years of playing -- except that one merchant in the academy convoy exercise.

However, merchants can see your periscope, and if just one of them sees it, they all react.

Firing at more than one target in a convoy is how many play, but I see it as a fast way to waste torpedoes. Unless your aim and your math are perfect, you are bound to miss some in the excitement of the moment.

Better to pick one target, sink or cripple it, then reacquire the convoy later.