Seeing the hard battle of his side, Hidetsugu HASHIBA guessed that the Sengokubori-jo Castle's defense was not enough because it had been built quickly and had more than 3,000 of his direct soldiers such as Yoshimasa TANAKA and Shigeaki WATARASE flank the castle.
味方の苦戦を見て、羽柴秀次は千石堀城がにわか造りゆえに防備は十分でないと推測し、田中吉政・渡瀬繁詮ら直属の将兵三千余を側面から城に突撃させた。