As long as everyone has plenty of ammo and some of the advanced or further advanced combat skills (advanced martial arts, fencing, advanced long arms... whatever) it shouldnt even depend that much on level. I'd be up for it.
I'm guessing wed have to do a fair bit of preperation... hide en mass in buildings near the enemy stronghold, wait for our AP to recharge and then make a coordinated rush on their ward and the people inside... I'd suggest that the lower levels attack the ward, freeing up the stronger people to take out the enemy inside.