tip 1: the Y-wing proton torps reload over time. Fire off your 4 shots at defection towers, then fly around for a while, shoot some ties, some turrets, cover your buddies. Then bomb them again.
tip 2: some turrets are indestructible. boo-erns.
tip 3: I found you'll have to nose up and then be coming DOWN towards the exhaust port. Press Alt to get rid of the imperial icon- it wont help you. The port is below the icon, almost on the floor of the trench. a shot that impacts the back of the port will be considered to go in.
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''Its over. Angel won.'' RSF Gurd