However, among the vassals of both families there existed a strong grudge because Nobuhide ODA (father of Nobunaga) and Hirotada MATSUDAIRA (father of Ieyasu) fought and were old enemy relation for each other, thus the alliance was not formed easily.
しかし、両家は織田信秀（信長の父）と松平広忠（家康の父）が宿敵関係で戦っていた経緯から、両家の家臣団の間での遺恨も強く、同盟はなかなかまとまらなかった。