After that, during the time of Tadamasa MIZUNO, the lord of Ogawa-jo Castle, the Mizuno clan expanded their power as far as Aomi County, Mikawa Province and established their base at Kariya-jo Castle (Kariya City).
その後、緒川城主水野忠政のときには三河国碧海郡に勢力を伸ばして、刈谷城（刈谷市）に拠った。