Don't worry, I've already done it on all 10 of my characters + a few friends, so I'm not looking for help in doing it. However, I LOVE this mission. It's one of my favourite bits in GW1. Half an hour of pure action, for once NPCs have your back, a truly epic moment (far better done than the BMP Battle of Jahai mission, which doesn't quite manage to catch the feeling of a massive war).
But, sadly, it's not repeatable...
I kinda wish they added a "recreation" option for it. With 7 heroes and the Embark beach coming up, I wonder if they will think of adding this to the list of missions to do. Just for replay value
P.S.
Does anyone know if any of the NPCs can resurrect themselves? I could swear some did...