In the Jinshin War of year 672, Fukei raised his army to support Oama no Miko (Oshiama no Miko or Prince Oama who became Emperor Tenmu following the victory in the war); he beat enemy's troops which advanced to Yamato City, and took control of those troops to become a general of Yamato Province.
672年の壬申の乱で、吹負は大海人皇子（天武天皇）側に立って兵を挙げ、飛鳥の倭京に集結中の敵軍を乗っ取って、倭（大和国）の方面の将軍になった。