 Yoshioki's support for Yoshitada placed him in opposition to Masamoto, who backed Yoshizumi as the "shōgun".Aiming to expand their domain, Shōni Masasuke, and his son, Takatsune, joined forces with Ōtomo Masachika and his brother, Chikaharu, to attack the Ōuchi by advancing from Hizen Province into Chikuzen Province.Late in 1496, Yoshioki responded by gathering men in Akamagaseki in Nagato, from which the army headed toward Chikuzen.