After an hour or so of flying back and forth on the first level of the "Empire" section, I'm at a loss of how I'm supposed to get out. I used the Snowspeeder tow cable on the 10 AT-STs, and no matter where I go, they just keep on coming, with no apparent exit (for me, at least) and no decrease in amounts of Imperials.
Oh crimany, it took me FOREVER to figure this out. Remember those purple missile things? You have to take one up to the cave at the very top of the area, use it to destroy the ice and fly through into the next section. The rest of the level is just a bitch to get through, since AT-STs will be attacking you while you try and tow the AT-ATs.
As for me, I'm also playing in order, and I've just finished the ground part of the Battle of Endor, I believe there are 2 levels left for me to finish. Then it's off to Free Play mode and redoing Story Mode to get all the extras. I also love how you can use Prequel characters from the first game in Free Play mode.
Great game!