The Shoni clan invaded frequently into Chikuzen leading troops of the Hizen Province and the Tsushima Province in order to sweep the Ouchi clan, but it was ruined by gekokujo by the Ryuzoji clan who joined the side of the Ouchi clan.
少弐氏は肥前・対馬国の兵を率いて大内氏掃討に何度も筑前に侵入するが、逆に大内氏の側についた龍造寺氏の下克上により滅ぼされた。