In the late stage of Shingen's time, the strategy was changed from advancing northward to advancing southward and he invaded into Suruga and confronted with the Oda and Tokugawa clans in Owari and Mikawa.
信玄後期には北進から南進へ方策転換し駿河侵攻を行い、尾張、三河の織田・徳川氏と対峙した。