On the seas, the Fire Nation also initiated raids on the Northern and Southern Water Tribes, which devastated the South, while the North managed to remain relatively untouched for almost a century. Over the course of the next hundred years, the Fire Nation slowly advanced into the Earth Kingdom and established several colonies on the mainland. Following the destruction of the Air Nomads, the Fire Nation launched a massive coordinated invasion on the western Earth Kingdom. The war began in 0 AG with the infamous genocide of the Air Nomads, whose air temples were falsely presumed to be unassailable to the Fire Nation due to the Air Nomads possessing the sole means of getting to them. Taking advantage of the absence of the Avatar and using their economical, technological, and military superiority for most of the war, the Fire Nation was able to wreak worldwide destruction and widespread loss of life upon the other nations. The war was initiated by Fire Lord Sozin, who wished to expand the Fire Nation into a worldwide empire and spread what he saw as his nation's prosperity to the rest of the world. However, over the course of the escalating conflict, several smaller factions became involved in the fighting as well. The conflict was waged by the Fire Nation against the other three nations: the Earth Kingdom, the Water Tribes, and the Air Nomads.

The Hundred Year War, also known as the Great War or just the War, was a major global military conflict that began with the Air Nomad Genocide and lasted for a century, from 0 AG to 100 AG. Dai Li representative (Spring - Summer 100 AG).Princess Azula (Late 99 AG - Summer 100 AG).Fire Lord Sozin (Late summer 0 AG - 20 AG)†.Grand Secretariat Long Feng (? - Spring 100 AG).Avatar Aang (Winter 99 AG - Summer 100 AG).

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