How do you do 12vs12?

Can someone please enlighten me where I can do 12vs12 battles Is it like a guild thing, or can I just get a rnadom PuG?

~prime

GO to your guild hall and talk to the alliance battle NPC. They'll transport you to an area where you form 4 man teams (PUGs) that you will enter the mission with.

It should be added that your guild/alliance has to have an affiliation with either the Kurzicks or the Luxons.

If you can synchronize the entry properly, it can be a guild/alliance thing...