He served outstandingly in 'the first battle of Ueda' (there is no evidence that Nobushige SANADA joined this battle, but it is likely that he was at the Uesugi family as a hostage) and in 'the second battle of Ueda,' which was a preliminary skirmish of 'the Battle of Sekigahara' leading ninja (professional spies in feudal Japan, highly trained in stealth and secrecy) armies, including Sanada Juyushi; he then fought hard in 'Osaka no Eki,' but was at the end of his physical life and died on the battlefield of Osaka Natsu no Jin.
「第一次上田合戦」（真田信繁はこの戦いに参加した証拠が無く、上杉家に人質として入っていた可能性が高い）、「関ヶ原の戦い」の前哨戦である「第二次上田合戦」で、真田十勇士等の忍者軍団を使い大活躍し、その後「大坂の役」でも奮戦するが、大坂夏の陣で力尽き討死する。