Kazumasu negotiate and convinced his cousin, Tanetoshi, to switch sides joining Hideyoshi and giving up the castle to him. Later, Kazumasu and Tanetoshi then attempted to attack Oda's, nearby Ono castle, but they were repulsed by Oda Nagamasu, when the Oda defenders threw torches into the attackers' boats.
Kazumasu negotiated and persuaded his cousin, Tanetoshi, to switch allegiance and join Hideyoshi, relinquishing control of the castle in exchange. Subsequently, Kazumasu and Tanetoshi attempted to assault Oda's nearby Ono fortress but were thwarted by Oda Nagamasu when the defenders hurled torches into the attackers' boats.