・On January 10, 1599, Toyotomi Hideyori moved to Osaka Castle with Maeda Toshiie, who was ill, and Tokugawa Ieyasu remained at Fushimi Castle to perform government affairs. It was a situation where the administration split between Osaka and Fushimi. Nakatokugawa Ieyasu tried to establish a marriage relationship with Date Masamune, Fukushima Masanori, and Hachisuka Kasei through friendship with his generals. In response to this, Maeda Toshiie 4 and the 5 magistrates pressed Tokugawa Ieyasu to deviate from the fate of Toyotomi Hideyoshi, who prohibited marriage without permission, but Ieyasu, on the contrary, tried to remove himself from the retreat route and rebelled against Hideyoshi (p12)
・On 1599/3/3, Maeda Toshiie, who was a contribution of Toyotomi Hideyori and suppressed confrontation between the martial arts faction and the partition faction within the Toyotomi family, died of illness. The next day, an incident occurred where 7 warlords of the martial arts faction, including Kato Kiyomasa, Asano Yukinaga, Fukushima Masanori, Kuroda Nagamasa, and Hosokawa Tadaoki, attacked Mitsunari Ishida. ISHIDA Mitsunari was protected by Satake Yoshinobu and fled to Fushimi. Tokugawa Ieyasu arbitrated the two, and instead of having 7 warlords withdraw his army, he decided to dismiss Mitsunari Ishida from the position of magistrate and have him live in captivity in Sawayama (p13)
・On 1599/9/7, Tokugawa Ieyasu headed to Osaka to celebrate Shigeyasu to be held on the 9th, and Ieyasu told that there was an assassination plan for Ieyasu with Maeda Senior as the mastermind. Ieyasu stayed in Osaka even after the gift ceremony, which was important in the name of this, and then disobeyed Hideyoshi's rule to act on behalf of government affairs in Fushimi on the 27th, and joined the Osaka Castle Maru (p13)
・ On 1600/7/17, the “Naifu Chikahi Rules,” which describe Tokugawa Ieyasu's disobedience to the fate of Toyotomi Hideyoshi, were issued to the feudal lords by the 3 magistrates of Masuda Nagamori, Maeda Geni, and Nagatsuka Masayasu. In response to this, Ukita Hideie, Shimazu Yoshihiro, Toyohisa, Kobayakawa Hideaki, Chosokabe Morichika, Konishi Yukinaga, Wakisaka Yasuji, etc. gathered in Osaka, and it is said that the military strength was about 90,000, but the speculations of the generals who gathered at Osaka Castle were not uniform (p16)
・Shimazu Yoshihiro had been requested by Tokugawa Ieyasu for some time to defend Fushimi Castle in the event of an emergency, so he tried to enter Fushimi Castle, but it is said that he was rejected by Torii Mototada and unavoidably joined the Western Army (p17)
・Tokugawa Ieyasu stayed at Edo Castle until 9/1. This is because at the time of Koyama's assessment, it was thought that two people, Ishida Mitsunari and Otani Yoshitsugu, raised an army, but after that, they came to know the “Naifu Chikahino Jojo” by the joint bureau of the Toyotomi administration, and they were concerned that feared that feudal lords favored by Toyotomi would join the Western army, and were unable to move (p19)
