A reason why Kenshin, who demonstrated unrivaled strength in battle, could not gain full control of the nation was that he had to often settle uprisings of the Ikko sect followers in Ecchu Province (although he believed in Buddhism, Kenshin professed the Shingon sect).
戦では無類の強さを発揮した謙信が天下を取れなかった理由は越中国の一向一揆に手間取ったこともあげられる（謙信は仏を信仰していたが、信仰していたのは真言宗）。