Is there any guide to doing the Lunatic Alberian Front? I see a lot of comments about people not knowing the pathing or what to do but no real advice showing how it should be done.

So far I've tried going left, going right. Tried following people, tried going alone. Tried guarding the gate. I haven't finished one yet and it seems the castle just gets overrun within a minute and everyone dies.

Half of my attempts end with someone saying "Auugh" and giving up within the first 30 seconds.

I'm pretty sure I'm doing it wrong most of the time but I have no idea what I should be doing. What should I be doing so that I'm not the one causing fails?