You have few options. First use a retreat strategy - when an opponent toon use taunt u should retreat. If your opponent cast ben's spell - retreat.
Second - It is good to have 2 or even 3 squads
Third - If you don't like the battle's end, just close the app and rejoin.
Assuming you don't get wrecked by RNG for generating opponents, your best strategy for every fight is to target out their fastest characters. This way, after you retreat and sub in characters you will get to go first and hopefully get a few extra turns of damage in. Chewie is really bad for GW because he's so slow that by the time he can taunt the enemy has already done a lot of damage to other important characters
Another thing retreating does is eat cooldowns; your enemies remember their CDs between battles just like your squad does. So if you get stunned by Dooku or affected by a Chewie taunt, you can retreat out and when you restart, not only are the debuffs cleared, but those abilities won't be ready for use right away either. Win/win! You can put out a team of level 1 heroes to bait out particularly nasty abilities if you want.
You have to be a bit of a liar to tell a story the right way.
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Second - It is good to have 2 or even 3 squads
Third - If you don't like the battle's end, just close the app and rejoin.
As has been posted, you can retreat and restart the fight from where you left off. All buffs and debuffs are cleared when you do this.
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