In an offensive and defensive battle of Ueda-jo Castle in Shinano Province in 1585, he bravely fought together with his brothers under the condition that the entire army was at the mercy of Masayuki SANADA's command.
天正13年（1585年）、信濃国の上田城攻防戦では全軍が真田昌幸の采配に翻弄される中、兄らと奮戦した。