Ujitsuna HOJO, however, viewed the succession by the young Tomosada to the head of the family as an opportune moment, and launched an attack on Kawagoe-jo Castle in August, routing Tomosada.
ところが若年の朝定が家督相続したのを好機と見た北条氏綱に7月には河越城を攻められ、朝定は敗走した。