Harmony Restoration Movement

The Harmony Restoration Movement was a movement to remove the Fire Nation presence in the Earth Kingdom by transferring the Fire Nation colonials back to the Fire Nation. The movement lead to a conflict between Earth King Kuei and Fire Lord Zuko, mediated by Avatar Aang.

Background
Before the beginning of the War, Fire Lord Sozin occupied Earth Kingdom territories and transferred Fire Nation citizens to the area. When Avatar Roku confronted him about it, Sozin attacked back, but was defeated. Roku ended the colonies, but following Roku's death, Sozin reestablished the colonies. As the War continued, more land was occupied and more towns were formed. These practices continued through the reign of Fire Lord Ozai.

Immediately following the end of the War, Zuko, Aang and Kuei met to discuss restoring peace. Zuko pledged to rid the Earth Kingdom of the colonies at all costs while Aang volunteered to ensure everything goes peacefully. The process continued without problem for nearly a year until an assassin made an attempt on Zuko's life. When she revealed herself to be the daughter of the Mayor of Yu Dao, the oldest colony in the Earth Kingdom, Zuko decided to personally remove the colonies.

Conflict
Upon arrival, Zuko is convinced to abandon the movement when he saw the multiracial family of Mayor Morishita. He forced the colonials to remain in the city announced his rejection of the agreement. He also ordered that no one would be allowed into the city without his permission. When Aang arrived, he and Katara were assaulted by several Firebending guards, only ending when Zuko bound Katara with hopes of making the duo give up. The arrival led to a scuffle, during which Zuko agreed to another talk with Earth King Kuei in hopes of achieving future peace.

As Aang was leaving Yu Dao, he met up with Smellerbee and explained the situation. She was angry at Aang's decision to support peace and gave Aang an ultimatum: complete negotiations within three days or the Freedom Fighters would attack Yu Dao.