On June 15, 1189, under the order from Yoritomo, FUJIWARA no Yasuhira attacked Koromogawa no Tachi (residence of the Oshu Fujiwara clan), where Yoshitsune was staying protected by his several hundreds horse soldiers.
文治5年（1189年）閏4月30日、頼朝の命を受けた藤原泰衡が、従兵数百騎で義経が暮らす衣川館を襲撃。