Battle of Sekigahara

The Battle of Sekigahara was a decisive battle on September 15, 1600 (on the ancient Chinese calendar, October 21 on the modern calendar) that cleared the path to the Shogunate for Tokugawa Ieyasu. Though it would take three more years for Tokugawa to consolidate his position of power over the Toyotomi clan and the daimyo, Sekigahara is widely considered to be the unofficial beginning of the Tokugawa bakufu, the last shogunate to control Japan.

The Battle

Ishida, in his home Sawayama Castle, met with Outani Yoshitsugu, Mashita Nagamori, and Ankokuji Ekei. Here, they forged the alliance, and invited Mori Terumoto to be its head.

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Ishida then officially declared war on Tokugawa and lay siege to the Fushimi Castle, garrisoned by Tokugawa retainer Torii Mototada on July 19. Afterwards, the western forces captured various Tokugawa bases in the Kansai region. Within a month, the western forces had moved into the Mino province, where Sekigahara was located.

Related Topics:
Fushimi Castle - Torii Mototada - July 19 - Kansai - Mino province

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Back in Edo, Tokugawa received news of the situation in Kansai and decided to deploy his forces. He had some former Toyotomi daimyo engage with the western forces while he split his troops and marched west toward the Osaka Castle. Tokugawa Ieyasu's main forces marched on Tokaido whilst his son, Hidetada, led another group through Nakasendo. However, Hidetada's forces were bogged down as he attempted to besiege Sanada Masayuki's Ueda Castle. Even though the Tokugawa forces numbered some 38,000, an overwhelming advantage over Sanada's mere 2,000, they were still unable to capture the strategist's well-defended position. As a result, Hidetada's forces never arrived on the battlefield at Sekigahara.

Related Topics:
Edo - Osaka Castle - Tokaido - Hidetada - Nakasendo - Sanada Masayuki

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Knowing that Tokugawa was heading toward Osaka, Ishida decided to abandon his positions and marched to Sekigahara. On September 15, the two sides started to deploy their forces. The eastern forces had 74,000 men, whilst the western forces numbered around 82,000.

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Even though the western forces had tremendous tactical advantages, Tokugawa had already contacted many daimyo on Ishida's side, promising them land and leniency after the battle should they switch sides. This led some western commanders holding key positions to hesitate when pressed to send in reinforcements or join the battle that was already in progress.

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Mori Hidemoto and Kobayakawa Hideaki were two such daimyo. They were in such positions that if they decided to close in on Tokugawa forces, the western forces would in fact have Tokugawa surrounded on three sides. Mori Hidemoto, shaken by Tokugawa's promises, also persuaded Kikkawa Hiroie not to take part in the battle.

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Even though Kobayakawa had responded to Tokugawa's call, he remained hesitant and neutral. As the battle grew more intense, Tokugawa Ieyasu finally ordered arquebusiers to fire at Kobayakawa's direction, a move that forced Kobayakawa to join the battle on Tokugawa's side.

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His forces assaulted Outani Yoshitsugu's position, which quickly fell apart as Outani was already engaging Todo Takatora's forces. Seeing this act of treachery, western generals such as Wakisaka Yasuharu, Ogawa Suketada, Akaza Naoyasu, and Tsuki Mototsuna immediately switched sides, turning the tide of battle.

Related Topics:
Todo Takatora - Wakisaka Yasuharu - Ogawa Suketada - Akaza Naoyasu - Tsuki Mototsuna

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The western forces disintegrated afterwards, and the commanders scattered and fled. Some committed suicide (such as Outani), some were captured (e.g. Ishida, Konishi, and Ankokuji), and others were able to return to their home provinces (e.g. Shimazu Yoshihiro and Mori Terumoto).

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