In April 1390, Yasuyuki raised an army in Kojima-jo Castle, Ikeda District, Mino Province (Ibigawa-cho, Gifu Prefecture), but he was defeated and eventually lost his power.
翌明徳元年（1390年）閏3月に康行は美濃国池田郡小島城（岐阜県揖斐川町）で挙兵するが敗れて没落した。