Mitsunari ISHIDA, who saw the military presence within the territories in the vicinity of the capital as an opportunity, massed various anti-Ieyasu Daimyo, such as Terumoto MORI, Hideie UKITA and Yoshitsugu OTANI, raised an army, and on July 17, purged the Rusuiyaku (persons representing the master during his absence), who remained in the western citadel of Osaka-jo Castle on orders from Ieyasu, and then thrust 13 articles of impeachment upon Ieyasu.
畿内に軍事的空白が生まれたことを好機と見た石田三成は、毛利輝元、宇喜多秀家、大谷吉継ら反家康派の諸大名を糾合して挙兵し、7月17日、家康が大坂城西の丸に残していた留守居役を追放して、家康に対する13か条の弾劾状を叩きつけた。