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In a letter to Sanada Masayuki, Mitsunari planned to intercept the Eastern Army near the border between Owari and Mikawa, and win by pincer attacking them from behind with the Uesugi and Satake armies. To achieve this, he needed to pacify Mino and Ise as soon as possible and then rush into Owari. Ukita Hideie and his Western Army troops, about 30,000 strong, advanced along the Iseji route, and forced the surrender of Iga Ueno Castle, the residence of Tsutsui Sadatsugu, and then captured Anotsu Castle, where Tomita Nobutaka was holed up, and Matsusaka Castle, owned by Furuta Shigekatsu, and took them by August. They then advanced further north, aiming to capture Owari, and had the brothers Ujiie Yukihiro and Ujiie Yukitsugu of Kuwana Castle join the Western Army. However, upon receiving news that the advance troops of the Eastern Army were gathering at Kiyosu Castle, they gave up on attacking Nagashima Castle, where Fukushima Masayori and Yamaoka Kagetomo were stationed, and headed for Ogaki Castle, where Mitsunari was stationed. At this point, Mitsunari's strategy of intercepting the Eastern Army in Owari and Mikawa had failed, and he revised his plan to intercept them at the Kiso River. Furthermore, Uesugi Kagekatsu, who planned to pincer the Tokugawa army from behind, did not attack the Tokugawa army, but instead headed his forces towards Mogami Yoshimitsu's territory in Yamagata. The Satake army was strongly opposed by Satake Yoshishige, his father, his brother, and all his senior vassals, but Yoshiaki was unable to push through the opinions of Satake's head, Satake Yoshiaki, who insisted on joining the Western Army. He ended up taking an ambiguous stance, such as sending Satake Yoshihisa with a small number of troops to join Hidetada's army, and did not rush into Ieyasu's territory in the empty Kanto region. In the end, it was a major miscalculation for Mitsunari that Satake Yoshiaki and Uesugi Kagekatsu, the two great daimyo of the Kanto and Tohoku regions, did not attack the Tokugawa army heading towards Osaka. Furthermore, Nabeshima Katsushige, on the orders of his father Naoshige, remained near the border between Mino and Ise, and withdrew from the Ukita and Mori forces heading for Ogaki Castle. Thereafter, he did not take part in the military actions of the Western Army, but instead watched from the sidelines.