Go to Tazoon and talk to some of the npc's there. There was a whole quest line where you get the history of the WA. I'm not sure, but if you speak to all the npc's there, it'll tell the story of the great battle that caused the birth of the WA and what caused the big crater outside of Tazoon in the subsequent battles.
It's been a while, but I remember something along that line.