Well...this mission went unresolved. The objective is to protect your ISD and wipe out all the rebel forces before the Grand Moff's shuttle arrives. I THOUGHT I did that, yet as far as I know the shuttle never spawned. I suppose it's possible it might have something to do with the fact that I am soloing an 8-man cooperative mission, although as far as I could tell all the ships were accounted for and were powered by AI. At any rate, the strategy is pretty simple: either play as a bomber or a T/F, take out the Y-Wings ASAP, then engage the X-Wings and A-Wings. I suppose you could try to prevent all the torpedoes from hitting the ISD, but I can't imagine that would be very successful.