In Kakitsu War occurred on July 21 of the following year, 1441, Yoshinori was assassinated by his vassal Mitsusuke AKAMATSU, and Nobukata joined the army to destroy the Akamatsu clan in accordance with the order of the shogunate.
翌嘉吉元年6月24日(旧暦)（1441年）の嘉吉の乱で、義教が家臣の赤松満祐に暗殺されると、信賢は幕命に従い赤松氏討伐軍に従軍する。