However, in 1573, Sadayuki betrayed the Asai clan to let the Oda army in the Yamamotoyama Castle, which resulted in the isolation of the Odani-jo Castle leading to the ultimate downfall of the clan.
しかし1573年、信長に内応し山本山に織田勢を引き入れたため、小谷城は孤立し主家滅亡の遠因をつくる。