If you can't assist, how are you supposed to attack out of turn 20 times?

This is the first Galactic Challenge I've actively disliked in a long time. I don't always get Box 10 but I don't dislike the Challenge as a result.
However finding a squad that can survive long enough to counter attack at least 20 times without slaughtering the oppeonent first and all while often being mass stunned in the process is not fun.