This conspiracy stemmed from the generals' dissatisfaction with Mitsunari, who had written unfavorable assessments and downplayed their achievements during the Imjin War against Korea and the Chinese empire.

However, Mitsunari learned of their plans through a report from Jiemon Kuwajima, a servant of Toyotomi Hideyori, and fled to Satake Yoshinobu's mansion with Shima Sakon and others to hide.

Instead, he negotiated, promising to allow Mitsunari to retire and to review the assessment of the Battle of Ulsan Castle in Korea, which had been a major point of contention.

[7] However, historian Watanabe Daimon, drawing from primary and secondary sources regarding the incident, argued that this was more of a legal conflict between the generals and Mitsunari, rather than a conspiracy to murder him.

[5][9] Muramatsu Shunkichi, author of "The Surprising Colors and Desires of the Heroes of Japanese History and violent womens", assessed that Mitsunari's failure in his war against Ieyasu was due to his unpopularity among the major political figures of that time.

[10] In July 1600, Ishida Mitsunari attempted to gain leverage over those leaning towards Ieyasu by taking hostages from families residing in Osaka Castle.

On October 20, 1600, at the Battle of Sekigahara, Tadaoki commanded 5,000 men in the Tokugawa vanguard, clashing with the forces of Shima Sakon.