Outraged by the arrogance with which Yoshimasa interfered in the Kanrei families' affairs despite his position as a mere steward, the leaders Katsumoto HOSOKAWA and Sozen YAMANA came together to banish Sadachika from the bakufu.
将軍家々宰の身分でありながら管領家々督に口をはさむ貞親の横暴に激怒した有力者細川勝元と山名宗全は協力して貞親を幕府から追放した。