Yoshitaka OUCHI (a son of Yoshioki) ordered Okitsura SUGI, Shugodai (deputy of Shugo, provincial constable) of Chikuzen Province, to lead the warlords of Kitakyushu in the Ouchi side to attack Seifukuji-jo Castle in Hizen Province, the castle of Sukemoto SHONI (a son of Sukemoto SHONI) in Hizen Province.
大内義隆（義興の子）は宿敵の少弐資元（政資の子）に止めを刺すべく筑前国守護代杉興連に命じて大内方の北九州の諸将を率いさせ、資元の居城肥前国勢福寺城を攻撃させた。