On May 1189 (leap April 1189 under the old lunar calendar), Yasuhira gave in to this and attacked Yoshitsune at Koromogawa no Tachi (residence of the Oshu-Fujiwara clan), where Yoshitsune was living, forcing Yoshitsune to commit suicide.
屈した泰衡は文治5年（1189年）閏4月、衣川館に住む義経を襲い、自害へと追いやった。