In 1575, when Nobushige was nine years old, Katsuyori TAKEDA, who was the master of the Sanada clan and was governing Kai and Shinano provinces, was defeated by the Oda and Tokugawa allied forces in the Battle of Nagashino.
天正3年（1575年）信繁が9歳の時、真田氏の主家で甲斐国・信濃国を治める武田勝頼が、長篠の戦いで織田氏・徳川氏連合軍に敗北する。