We built a base specifically for purges. When we are setting up, doling out food and arrows, I open the doors all the way to the coffer. Demolishers can’t demolish a door that’s not there. This isn’t a new tactic. We’ve been doing it for a few months. They don’t even make it through the courtyard. The thralls dumping hot tar and flaming tar do quite a bit of damage.
Since the update, we’ve run 7 Level 10 purges without issue. We did this really to get bartenders for ourselves, and allies.