Editing Warring Dukedoms period (section)

== Second Warring States period ==
In 442, the Kim governate sensed that the Hwang government was growing weak, and the leader, Kim Sang-ho stood at the banks of the Yeong River and legendarily{{Efn|So used because historians debate whether this genuinely occurred.  However, the event carries deep significance for those in Imyu and Yeongnam to this day.}} burned a copy of the Four Party Ceasefire urging his troops across pontoon boats towards Sangju.  Meanwhile, a new force emerged amongst farmers and miners in the central mountains and northern plains united under the Lee family, utilizing horseback maneuvering more efficiently than southern forces, who had relied mainly on infantry with archery forces to cover them.  As such, they made a bold decision to take the opportunity and strike, crossing the eastern Maehwa Mountains and moving into Hwang territory.  Sangju was beseiged, and then captured and burned in 461, and shortly after that, the Kim Dukedom absorbed the Jeong and Im Dukedoms, forming a cohesive political entity across the eastern seaboard of Haesan.