The course of the war became disadvantageous to Prince Otomo and when the last decisive battle took place in Seta on August 23, NAKATOMI no Kane followed Prince Otomo to the battle.
戦局が大友皇子側に不利となり、7月22日に瀬田で最後の決戦が行われたとき、中臣金は大友皇子に従って出陣した。