In the night of March 3, 1599, due to the death of Toshiie MAEDA, the 7 bushos, such as Kiyomasa KATO, Masanori FUKUSHIMA, Nagamasa KURODA, Tadaoki HOSOKAWA, Yoshinaga ASANO, Terumasa IKEDA and Yoshiaki KATO (however, some materials also include the names of Iemasa HACHISUKA and Takatora TODO), who belonged to the Budan-ha (political faction that was willing to resort to military means to achieve its aims) and had been in a hostile relationship with his father Mitsunari, attacked his father's Osaka residence.
慶長4年（1599年）閏3月3日夜、前田利家の死去により、父の三成と敵対関係にあった武断派の加藤清正、福島正則、黒田長政、細川忠興、浅野幸長、池田輝政、加藤嘉明の7将（史料によっては蜂須賀家政や藤堂高虎の名もある）が、父の大坂屋敷を襲撃した。