What happened to the Castle siege pvp map?

I remember playing in the Preview event and there was a pvp map where you entered the mission, and i think it was 8 vs 8. Anyways, one team had to rush a castle while the other team had to defend it. I don't remember how you won. I think the guild lord had to die or something. Anyways, what happened to that? It was fun.

join a guild, and GvG (guild vs guild)

It's:

Type: GvG-battle
Map: Warrior's Isle
Players in each team: 8
Total: 18

Others:
Archers
Archanists
Guild Lord
Guild Thief

Resource:
Trebuchet