Prince Naka no Oe, who was the head of state of Wakoku, approved their request, and in 661 Empress Saimei departed with the expeditionary force from Naniwa to Kyushu, but she met an untimely death at Kuni no Tsu (there a theory that she was assassinated).
倭国を率いていた中大兄皇子はこれを承諾、661年に斉明天皇は難波から九州へ出兵するも、邦の津にて急死する（暗殺説あり）。