I've been playing for a few months (lvl 78 at the moment), and in that time, i was able to finish this maybe (MAYBE) 3 times, no more. Usually i can get to 400 galactic war tokens (battle 5?) before i encounter a team which i have no chance of defeating, and can't advance beyond that point.
Is there a trick to this? Or is it just an **** design?
I've tried using a weaker team at the start, but they can't get past second, sometimes even the first battle...