In the Battle of Kawagoe-jo Castle in 1546, he accomplished a meritorious service in which he persisted in the tact of holding the castle for about half a year, which became the cause of the Hojo army's triumph.
天文15年（1546年）の河越城の戦いでは、半年余りを籠城戦で耐え抜くという大功を挙げ、北条軍大勝のきっかけを作っている。