Revolution
This was a revolution staged by the freed dragonborn against their former masters in an attempt to kill them and free their brethren, directly causing the Dissolution of the Agotharian Kingdoms.
In the beginning, they conducted raids by isolating individual dragons and killing them off individually, something that was not incredibly difficult to do after the Fall of Rythkar. However, the remaining chromatic dragons grouped together to prevent such a strategy from functioning. However, the metallic dragons eventually allied themselves with the dragonborn, going so far as to create metallic dragonborn to aid them. They were ultimately victorious, and with this victory the draconic regents concluded that they must step down from their positions of power, leaving the people of Ardrim to rule themselves.