Hey, suspect this is a little late for dharkus but came across this thread for the same reason as many previous posters.... could I 3 star this, no!
But I did and wanted to share it in case anyone else gets stuck on this.
1. Dropping chewie and leia on the west side of the map
After finding a youtube video demonstrating this method, I attempted to get the 3 stars but the hero ATST would usually ruin things and I'd not get past 80%.
The turrets also like to target medic droids so these get killed off quickly, leaving your units hopelessly overwhelmed.
2. Luring out all troops and using the strix to take them out
I tried various methods of bringing all the troops out and then luring them to a spot where I could take them out with a shot from the Strix but I either found the enemy troops wouldn't stay still long enough or I'd loose too many of my own trying to keep them there.
3. Luring just the hero AT ST and killing that!
This took a few gos but eventually I nailed it.
Drop one of the soldiers near the HQ to bring out both sets of troops and the hero. Then, when the soldier dies, drop a medic droid in the top left corner. Just as the hero gets close, drop Leia, the sharp shooters. Use the strix to take out the hero and the storm troopers. Whilst that's going on, drop chewie at the top of the map and he'll take care of the top 2 turrets and maybe more. Leia and the sharps will starting wondering off looking for more infantry so keep an eye on Leia's health, you'll probably have lost your bait droid as the hero doesn't seem to retarget. You should have a spare droid to keep her going. Drop the remaining soldiers as you need and drop Han and a medic droid on the bottom to take out the south and south eastern turrets.
Sit back and watch your forces be victorious!!!
Rebel Level 10
Proud member of TheMidnightMob