This video explains everything you need to know:
http://youtu.be/7oVzfzuts3oAdditional, practically irrelevant information:
Mercs are attacking Ambean on Monday, 4:57pm eastern with 1249 troops.
The Norse Horde stands ready with 2400 troops.
We have all manner of equipment stockpiled, including hundreds of mail shirts, hundreds of helms, enough heirloomed spears to build a fence around the village, bows, crossbows, etc.
I think we have a solid chance of destroying the Merc army if we can just equal them on the roster. If you're pretty sure you can make it, sign up for Ambean. (Double true if you can use a spear. I don't know why we have so many, really...)
Preference will be given to those in vent 15 minutes before the battle (check the battle page about an hour before the fight for vent info).
Lo there do I see my father.
Lo there do I see my mothers and my sisters and my brothers.
Lo there do I see the line of my people, back to the beginning.
Lo they do call to me.
They bid me take my place among them.
In the halls of Valhalla, where the brave may live forever.