According to popular theory In 1598 after the death of Toyotomi Hideyoshi, the government of Japan had an accident when seven military generals consisting of Fukushima Masanori, Katō Kiyomasa, Ikeda Terumasa, Hosokawa Tadaoki, Asano Yoshinaga, Katō Yoshiaki, and Kuroda Nagamasa planned a conspiracy to kill Ishida Mitsunari.
However, Mitsunari learned of this through a report from a servant of Toyotomi Hideyori named Jiemon Kuwajima, and fled to Satake Yoshinobu's mansion together with Shima Sakon to hide.
Ieyasu then negotiated to let Mitsunari retire and to review the assessment of the Battle of Ulsan Castle in Korea which became the major source of this incident.
[3] However, historian Watanabe Daimon stated from the primary and secondary sources about the accident that this was more of legal conflict between those generals rather than conspiracy to murder him.
[1][5] Muramatsu Shunkichi, writer of "The Surprising Colors and Desires of the Heroes of Japanese History and violent women”, gave his assessment that the reason of Mitsunari failure in his war against Ieyasu was due to his unpopularity among the major political figures of that time.