text: Ise Sadachika, the secretary of the mandokoro, a political organ of the shōgun family for nobles of the third rank or above, intervened with the consent of Ashikaga Yoshimasa, the eighth shōgun, in a disturbance within the Shiba clan who were one of the deputy families of the bakufu. Sadachika mediated between Shiba Yoshitoshi and Shiba Yoshikado in pursuit of his own interests, causing confusion in the bakufu administration. Influential figures including Hosokawa Katsumoto and Yamana Sōzen shared a sense of dismay at Sadachika’s intervention in the succession affairs of the deputy family notwithstanding his role as secretary of the mandokoro. In 1466, they collaborated to expel Sadachika from the bakufu administration in an event known as the Bunshō Political Incident (Bunshō no seihen). In the background, the expulsion of Ashikaga Yoshimi who was slated to become the next shōgun further complicated the situation.
  Meanwhile, the formation of an army in Kantō to conquer Ashikaga Shigeuji, the Koga kubō who opposed the bakufu, caused a series of changes in family leadership. Ashikaga Masatomo, the Horigoe kubō, the branch organ of the bakufu in Kantō, did not have an army under his direct control so efforts were made to dispatch the Shiba army under the bakufu to Kantō; however, Shiba Yoshitoshi disobeyed these orders. This escalated into a battle against Kai Yukihisa, the secretary to the Court for the Shiba family, in an event known as the Battle of Chōroku. This resulted in Yoshitoshi being removed from the line of succession and his son, Shiba Matsuōmaru (later known as Shiba Yoshihiro), became the twelfth head of the clan. Thereafter, the secretary for Masatomo named Shibukawa Yoshikado (the son of Shibukawa Yoshikane) then became the successor to the clan with the aim of enabling Yoshikane to manipulate the Shiba army.