Battle of Sekigahara
Ishida Mitsunari (1560-1600), the chief administrative staff of Toyotomi government, raised his army to stop the ambition of Ieyasu, but was defeated at the Battle of Sekigahara and was executed. After the defeat of the Western Army, the Toyotomi clan lost much of its sovereignty, even though Yodo-dono did not actively participate in the Battle of Sekigahara it is said that more than 2,000 Toyotomi vassals participated in the battle and relations between Tokugawa-Toyotomi declined.