After receiving the order on April 5, 1201, Sainen fought a fierce battle with Sukemori JO who stood ready to fight at Tossaka-jo Castle in Echigo Province, before defeating him (Kennin War).
命令は4月5日に西念の下に届き、越後国鳥坂城に構える城資盛を激戦の末に破った（建仁の乱）。