when you get up to 'the big robot' fly low and go fly alongside the legs... the as 15 said.... press the secondarie weapons botton. at some time when you are flying past the legs... you hear Luke Skywalker saying Detach cable... that but just press the button some times until something happens.... then you fly around the robots legs a couple of timeswith the cable that is.... it is a different view that normal flighht... an im guess that you will crash a couple of times before you get it right... it is one of the hardest things in the whole Rogue Squadron game. i think you have to fly 3 laps around it before the cable lets loose... you dont have to do that yourself.... then you'll see the AT-AT (as they are called) go down
I hope i helped you with this ....
"You know, if I had even the tiniest control over the Force,
What I,d do with it? I,d scratch that little spot in the center
of my back I can never reach."
X-wing book nr. 5. Wraith Squadron
Give in to the insanity. It is unreasonable, but it is your destiny!