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In page Tokugawa Ieyasu:

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Nearly all of Japan's daimyo and samurai were now split into two factions; the Western Army (Mitsunari's group) and the Eastern Army (Ieyasu's group). Ieyasu had the support of the anti-Mitsunari group, and formed them into his potential allies. Ieyasu's allies were Katō Kiyomasa, Fukushima Masanori, Mogami Yoshiaki, Hachisuka Iemasa, the Kuroda clan, the Hosokawa clan and many daimyo from eastern Japan. Mitsunari had allied himself with three other regents: Ukita Hideie, Mōri Terumoto, and Uesugi Kagekatsu, as well as with Ōtani Yoshitsugu, the Chosokabe clan, the Shimazu clan and many daimyo from the western end of Honshū.[citation needed]