Convoy attack, from the rear?

Realistic chance of success = about zero.
(The price of playing cowboy can be high, but sorry you lost your boat, crew, and "life".)

In mitigation, it used to work in Aces of the Deep, but GWX is a different kettle of fish. After a couple of unsuccessful attempts this way, due only to desperation resultant from very low visibility, I have learned to avoid this method.