During the battle, he spread a false rumor that named Noritsugu YAMAGUCHI and Shizaemon TOBE, who had switched their allegiance from the Oda to the Imagawa clan, as double agents still secretly communicating with the Oda forces; Yoshimoto IMAGAWA executed them, bringing success to Yoshinari's strategy of driving a wedge of distrust through the enemy forces.
同戦いにて、織田から今川に転じた山口教継、戸部新左衛門の名を語らい、両名が織田に内通していると流言飛語の策を弄し、両名が今川義元の手討ちとなり、敵方切り崩しに成功。