三方原之戰
Kazumasu was sent by Oda Nobunaga to provide reinforcement to Tokugawa Ieyasu when he was attacked by Takeda Shingen at Battle of Mikatagahara (1572), this included Siege of Nagashima (1573) and also fought in Battle of Tedorigawa (1577), and the Tenshō Iga War (1579-1581) in Iga Province. Kazumasu's achievements include the capture of Seki castle. He participated at Battle of Tenmokuzan (1582) againts Takeda clan last remnants.