He fought for his uncle at the Battle of Kawanakajima (1561), the Battle of Mikatagahara (1573), and the Battle of Nagashino before defecting to the service of Tokugawa Ieyasu, aiding him in his campaign against Takeda Katsuyori. He was rewarded by Tokugawa with a fief in Kai Province for his service, but was killed by Takeda sympathizers soon afterwards.