When Katsumasa was informed of his brother's death, he also charged the opponent's headquarters alone and made a surprise attack on Shigenaga HONJO with his sword; but he was killed by Shigenaga and his close retainers.
兄戦死の報を受けた勝正もまた単身本陣へ突入し、不意をついて本庄繁長に斬りかかったが逆に繁長と側近達に討ち取られた。