Have drop ships bring in more and more AT-ATs during the battle, in the background beyond their energy shield of course.
Have tie fighters make strafing runs.
have at-sts picking off people
Speeder bikes zipping around
and then once the shield is down have our cruisers create a perimeter while our fighters....wait I mean once the shield is down have the Star Destroyers start hitting stuff from orbit... the base, fleeing ships.
Have the x-wings flying escort engage tie-fighters to give the transports time to get past the Star Destroyers. Have them pwned since its only "two fighters against a star destroyer?"
yah...that would be sweet