Soon after the memorial service on the sixth day after Terumune's death, Masamune besieged the Nihonmatsu-jo Castle of Nihonmatsu clan for an avenging battle of Terumune's death; his troops engaged in a fierce battle against anti-DATE allied forces of Satake and Ashina clans with 30,000 soldiers organized for saving Hatakeyama clan, at the Hitotori-bashi Bridge in Adachi District.
その後、初七日法要を済ますと輝宗の弔い合戦のため早くも二本松氏の二本松城を包囲し、畠山氏救出のため集結した、佐竹氏・蘆名氏など3万の反伊達連合軍と安達郡人取橋で死闘を演じた。