Final Fantasy XI has released details on the Allied Campaign, an addition that is coming in the upcoming expansion, Wings of the Goddess.

This Topics will introduce a new large-scale battle system to be introduced in the upcoming Wings of the Goddess expansion pack, the "Allied Campaign."

The Treasures of Aht Urhgan expansion saw the birth of Besieged, allowing players for the first time to enjoy battle of a massively cooperative nature. On an even larger scale, the Conquest system has been available for all players to participate in from the very beginning of FINAL FANTASY XI service.

Continuing in this vein, the development team has been racking their brains for a new system to further intrigue the adventuring population of Vana'diel. The result? An endeavor that can be engaged in simultaneously by numbers exceeding those of Besieged, while at the same time allowing for individual actions to have concrete, observable repercussions in the world of Vana'diel, and plenty of good old-fashioned battle and strategy!
Set on the stage of the Crystal War itself, this is the Allied Campaign.

The overall campaign system is organized into four subdivisions: Campaign battles, Campaign Ops, headhunting, and tactical assessment.
Following is an in-depth description of each of these.

Get more details here.