First he followed the Hojo clan to join the assault on Shimoakasaka-jo Castle which was led by Masashige KUSUNOKI, and the assault on Kasagi-jo Castle, as a member of bakufu army.
はじめは北条氏に従って幕府軍の一員として楠木正成の下赤坂城攻めや笠置城攻めに参加し、功を挙げた。