Yoshimitsu did not miss this opportunity and commanded to put down Yasuyuki as a rebel in May 1389, so Yoritada TOKI and Yorimasu TOKI, father and son, of the Toki clan tried to do it.
義満はこの機を逃さず、康応元年（1389年）4月に康行を謀反人と断じて討伐を命じ、土岐氏一族の土岐頼忠・土岐頼益父子が征討に向かった。