In 1552, he took part in the war for the first time in the Battle of Kayatsu which was broken out between Nobunaga and Nobutomo ODA, the lord of Kiyosu-jo Castle of the Oda Yamato no Kami family (the Kiyosu Oda clan) who governed Owari Shimo Yongun (the lower four counties of Owari), and made an achievement of getting one severed head (Memoranda of Shigeyori MURAI).
翌天文21年（1552年）に尾張下四郡を支配する織田大和守家（清洲織田氏）の清洲城主、織田信友と信長の間に起こった萱津の戦いで初陣し、首級ひとつを挙げる功を立てる（村井重頼覚書）。