Yoritomo took a sea route to Awa Province to join up with the powerful family within the Sagami Miura peninsula, the Miura clan, and gathered various families such as the local officials of Awa Province, Hirotsune KAZUSA and Tsunetane CHIBA of the Boso peninsula, Tomoto ADACHI and Shigetada HATAKEYAMA of Musashi, rapidly becoming a major force.
頼朝は、海路で安房国へ移動して相模三浦半島の豪族である三浦氏と合流した後、安房の在庁官人をはじめ房総半島の上総広常、千葉常胤、武蔵の足立遠元、畠山重忠らの諸豪族を傘下に加えながら急速に大勢力となっていく。