The purpose was to subdugate Yoshiaki ASHIKAGA, who was openly showing hostile behavior, and had raised an army with Hisahide MATSUNAGA, Yoshitsugu MIYOSHI and Miyoshi sanninshu (Nagayuki MIYOSHU, Masayasu MIYOSHI and Tomomichi IWANARI).
松永久秀や三好義継、三好三人衆らと結んで挙兵し、公然と敵対行動を見せた足利義昭を討伐するためである。