 In 398, Gwanggaeto conquered the Sushen people to the northeast, who were Tungusic ancestors of the Jurchens and Manchus.In 479, Jangsu invaded the Khitans, and then attacked the Didouyu with his Rouran allies.In 404, Gwanggaeto defeated an attack by the Wa from the Japanese archipelago on the southern border of what was once the Daifang commandery, inflicting enormous casualties on the enemy.