My Rebel team strolled through to Round 8 on Military Might I. It then took me four attempts to beat Round 8 but I finally did so, unlocking Tier II in the process. I still get to Round 8 with rel...
I've beaten it easily every time with my k2s0 under a wedge lead being the star without a doubt.
Counter attacks for 10k and heals himself. They Don't get to attack anyone else. Special hits for 28k. If need be you can always use the event ability for extra healing.
You can check out how mine's modded by the link in my siggy.