The Battle of Sekigahara was a decisive battle on October 21, 1600 (Keichō 5, 15th day of the 9th month) in what is now Gifu prefecture, Japan, at the end of the Sengoku period. This battle was fought by the forces of Tokugawa Ieyasu against a coalition of Toyotomi loyalist clans under Ishida Mitsunari, several of which defected before or during the battle, leading to a Tokugawa victory. The Battle of Sekigahara was the largest battle of Japanese feudal history and is often regarded as the most important. Toyotomi's defeat led to the establishment of the Tokugawa shogunate.
Part of the Sengoku period
Date
October 21, 1600
Location
Sekigahara, Mino Province, present-day Gifu Prefecture, Japan
Coordinates
35.3705°N 136.4616°E
Result
Eastern army victory
Beginning of Tokugawa shogunate
Territorial
changes Tokugawa clan gains nominal control of all Japan
Belligerent
Western Army: Forces loyal to Ishida Mitsunari, many clans from Western Japan
Eastern Army: Forces loyal to Tokugawa Ieyasu, clans of Eastern Japan
Combatants
Western Army
Ishida Mitsunari (Executed)
Ukita Hideie
Ōtani Yoshitsugu †
Shima Sakon †
Chōsokabe Morichika
Gamō Yorisato †
Shimazu Yoshihiro
Shimazu Toyohisa †
Akashi Takenori
Konishi Yukinaga (Executed)
Toda Katsushige †
Ankokuji Ekei (Executed)
Kobayakawa Hideaki
Mōri Hidemoto
Kikkawa Hiroie
Natsuka Masaie †
Hiratsuka Tamehiro †
Eastern Army
Tokugawa Ieyasu
Fukushima Masanori
Tōdō Takatora
Hosokawa Tadaoki
Ikeda Terumasa
Oda Urakusai
Ii Naomasa
Matsudaira Tadayoshi
Kuroda Nagamasa
Takenaka Shigekado
Honda Tadakatsu
Furuta Shigekatsu
Katō Yoshiaki
Terazawa Hirotaka
Ikoma Kazumasa
Tsutsui Sadatsugu
Horio Tadauji
Strength
Western Army
120,000 initially,
81,890 by the time of battle
Eastern Army
75,000 initially,
88,888 by the time of battle
Casualties and losses
Western Army
8,000–32,000 killed
~23,000 defected
Eastern Army
4,000–10,000 killed
Background
In 1598 that Hideyoshi passed away in Kyoto. After he died, his only biological son, Hideyori, was only 6 years old and too young to govern the country. So, Hideyoshi appointed ten people to govern the country till his son was of age: the Five Commissioners (bugyo) and the Council of Five Elders (tairo). The commissioners were charged with politics and governance of Kyoto and the surrounding areas, while the Five Elders were some of the most powerful daimyos in the country.
Among those was appointed by the late Hideyoshi was Tokugawa Ieyasu, one of the 5 Tairo. Ieyasu was the most powerful of the Tairo, as he controlled the most of Kanto region. So, after Hideyoshi died, Tokugawa Ieyasu immediately began to position himself to be the next shogun. It was almost as if he’d been patiently waiting for this chance for years! Notably, he arranged several political weddings and gave his land to his subordinates. These were bold moves as it was not within his authority to perform these acts, but rather that of the Toyotomi clan, i.e Toyotomi Hideyori. One of the 5 Bugyo, Ishida Mitsunari, became uncomfortable with this obvious power grand and openly questioned Ieyasu’s intentions. The more Ieyasu took control, the more Mitsunari opposed him, and the relationship between these two quickly soured.
General Maeda Toshiie from Kaga (what is today Ishikawa Prefecture), would often intervene between these two in an attempt to preserve the order the late Toyotomi had put in place. But after Toshiie died in 1599, any unspoken truce between them essentially disappeared overnight.
Actually, Ishida Mitsunari didn’t have a good reputation with the members of the Tairo. Though respected for his intellect and had several notable military achievements under his belt, the generals viewed him as little more than a bureaucrat. Besides, it also didn’t help that Ieyasu had spread many rumors about him. For these reasons, several members of the Tairo, namely Kato Kiyomasa, viewed Mitsunari as unfavorable and plotted to assassinate him. In a strange turn of events, contrary to confronting them, Mitsunari turned to Ieyasu’s and asked for his assistance. In return for helping him, Ieyasu instructed Mitsunari to leave the capital and return to his castle in the Omi Province. Subsequently, Mitsunari left the capital humiliated, and though he was the one who’d sought Ieyasu’s help, that he now owed him his life was salt in the wound.
With Mitsunari is gone, nobody could stop Ieyasu. The Maeda clan tried to come forward to help reign in the power-hungry Ieyasu by publishing a public letter condemning his actions. The Uesugi clan of Tohoku, who were appointed regents to Hideyori, were also critical of Ieyasu and began to build their military forces. Ieyasu would not tolerate their defiance.
He publicly accused the Maeda clan of conspiring in a plot on his life. This forced the Maeda clan to surrendered to Ieyasu’s authority. The Uesugi clan, on the other hand, was unshaken. When Ieyasu condemned them for building their forces he demanded they come to Kyoto to explain themselves at once. In response, the chief advisor of the clan published a scathing counter-condemnation of Ieyasu’s blatant violations and abuses of power. Seething with anger, Ieyasu then dispatched his troops to Tohoku to suppress them.
However, this was a great opportunity for Mitsunari. Once Ieyasu left the capital, Mitsunari secretly assembled an army and declared war against Ieyasu. He appointed Mori Terumoto as the lead general of his army (as Mitsunari was not popular, he didn’t take this position for himself). Mitsunari began invading the castles of Ieyasu’s allies. After a few victories, Mitsunari and his other allies against Ieyasu gathered at Ogaki Castle in Gifu Prefecture. There, they decided to fight against Ieyasu on the infamous Sekigahara Battlefield, which is right near Ogaki Castle. The Sekigahara Battlefield was not unfamiliar with warfare, as had already served as the stage for one of ancient Japan’s most wars, the Jinshin War. It was also a very strategic location for Mitsunari and his forces since the area is surrounded by mountains with many important roads nearby.
Upon learning of Mitsunari’s actions against him, Ieyasu immediately pulled his troops out of Tohoku and headed back to Kyoto. However, during his march home, Ieyasu made camp by his main castle, Edo Castle. There, he wrote many letters to his allies across the Kanto Region and even to those who stood with his enemy. He wrote to Mitsunari’s allies and more or less promised, that if they were to suddenly put down their arms and join him, he would bear them no ill will.
Before long, he had remobilized his armies westward with one goal in mind; defeat Mitsunari.
The Battle
Both sides gathered in Sekigahara on October 21st, 1600. The armies were equally matched with roughly 80,000 each. Since the generals who sided with Mitsunari were mainly from the west, they were called Seigun (Western Amry) and the generals who sided with Ieyasu are called Togun (Eastern Army) because Ieyasu’s political influence dominated eastern Japan.
Mitsunari’s army arrived at Sekigahara first. They quickly set up camp on the top of the mountain so that they could command a great view of the battlefield. Meanwhile, most of Ieyasu’s forces settled at the foot of the mountain. For the time, it seemed Mitsunari had the advantage.
As dawn broke a thick fog hung in the air. While Ieyasu was confident, anxiety was running high for Mitsunairi. Though he had many soldiers, their allegiance to him was less than assured. A great deal of his most powerful allies still sat on the sidelines with their armies. He could not guarantee they would actually participate in the fight that was soon to begin.
Around noon, the fog lifted. Ieyasu’s ally, Ii Naomasa, fired his rifle and the battle was afoot.
As the battle dragged on, it became ever clearer to Mitsunari that the support of his allies was not as strong as he’d hoped. The fact of the matter is that the powerful leaders he’d called on for aid were loyal to Toyotomi Hideyoshi— not his young son. Moreover, Ieyasu was very powerful; basically half of the country was already in his pocket. Further undermining the commitment of Mitsunair’s allies were the letters Ieyasu wrote to them during his brief stay in Edo Castle. In return for their neutrality, Ieyasu guaranteed their lands would not be taken and they would not be punished. As a result, few of the generals fought hard as they could for Mitsunari. Even the Mori Terumoto, the leader of the Western Army, sat on the sidelines with hundreds of troops cautiously observing the situation.
Another powerful ally of Mitsunari, Kobayakawa Hideaki, reluctantly sided with the Western Army. However, when he saw Ieyasu shot at him with his gun, his blood ran cold. Terrified of Ieyasu’s revenge, Kobayakawa began to attack the troops of Mitsunair’s most faithful friend, Otani Yoshitsugu. After becoming fatally wounded on the battlefield, Otani killed himself (it was preferable to take one’s own life, so as to not be captured by the enemy). The death of Otani was the turning point of the battle. As Otani’s troops began to fall or flee in droves, Mitsunari’s soldiers realized they were on the losing side, and started to just run away.
The Battle of Sekigahara, the biggest battle of the bloody Sengoku Period, was over in only half-day.
The Aftermath
After the Battle of Sekigahara, Ishida Mitsunari was discovered in the nearby Shiga prefecture and arrested. He was drug to Sakai, an important and powerful port city that Mitsunari and his brother had played a crucial role in developing. There, he was drug through the street by horses. Then, broken and bleeding, he was taken to Kyoto and decapitated. Many other generals of Mitsunari’s side were also arrested or stripped of their land. Interestingly, Ieyasu didn’t punish Kobayakawa Hideaki for his participation in the Western Army. Kobayakawa’s betrayal has led many historians to conclude that he had agreed to fight for Ieyasu before the battle had even begun.
Perhaps if he and the other daimyo who’d pledged to fight for the Western Army had remained loyal, the outcome of this battle would be completely different. Some might even think it ironic that it was the disloyalty of samurai that ended their era as a powerful, elite social class.
Two years after the Battle of Sekigahara, Ieyasu began the Edo Government in Edo, present-day Tokyo. Realizing that powerful warriors could easily rise through the ranks and take what he’d already fought so hard to obtain. In order to prevent this, he stripped powerful samurai clans of their precious swords, taxed them heavily, and forced them to spend most of the year away from their lands. With the samurai knee-capped one key problem remained for Ieyasu; the Toyotomi clan. In fact, the only reason the Toyotomi banner did not fly during the Battle of Sekigahra was that Toyotomi Hideyori was simply too young to participate. In the end, even though Ieyasu, at last, seemed to have the military might he needed to be shogun, that title would ultimately illude him until he completely eliminated the Toyotomi clan.
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