As for the primary factor for the defeat of the Taira clan, historians and experts are strongly supportive in the theory that Cloistered Emperor Goshirakawa strategicly proposed a peace negotiation with the Taira clan, to significantly relax the guard of the militarily defenses for the Taira clan's army while cooperating with the Kamakura Government army that was preparing for the pending attack upon the Taira clan.
平氏敗北の要因について、後白河法皇が平氏へ講和の提案を行い、大幅に武装解除させる一方で、鎌倉政権軍と連携して対平氏攻撃を着々と準備した計略であるという説が有力である。