Despite the intense resistance of Yusai, it was unlikely that Yusai and his soldiers would have been able to fight equally against ISHIDA's army due to the lack of hope of support and the visible difference in force size, and accordingly, the battle to capture the castle started on July 19, and the castle was nearly captured by the end of July.
幽斎は頑強に抵抗したものの、やはり援軍の見込みのない籠城戦の上、兵力の差がありすぎたため、7月19日から始まった攻城戦は、7月末には落城寸前となったのである。