However, a vassal of Katsutoyo SHIBATA, who was an adopted child of Katsuie and had switched sides to Hideyoshi, let out information to the camp of Morimasa to the effect that Hideyoshi was in Ogaki and away from his castle.
このとき勝家の養子であったが秀吉側に寝返っていた柴田勝豊の家臣が、密かに盛政の陣に駆け込み、秀吉が大垣に赴いていて留守であることを伝えた。