Tokugawa Ieyasu Wins at Sekigahara and Founds a New Shogunate
A single day's battle in October 1600 hands one clan control of Japan for the next two and a half centuries
Quick facts
- Date
- 21 October 1600
- Winner
- Tokugawa Ieyasu (eastern army)
- Loser
- Ishida Mitsunari (western army, loyal to Toyotomi heir)
- Result
- Ieyasu becomes shogun in 1603, founding the Tokugawa shogunate
What happened
After Hideyoshi's death in 1598, the coalition of regents he had appointed to protect his young heir fractured. In October 1600, forces loyal to Tokugawa Ieyasu met forces loyal to the Toyotomi regent Ishida Mitsunari at Sekigahara, near Lake Biwa in central Japan. Nippon.com describes the two sides as roughly evenly matched, Ieyasu's eastern army near 88,000 against Mitsunari's western army near 80,000, but the battle turned when several of Mitsunari's commanders defected mid-fight. Ieyasu was victorious and became Japan's de facto ruler; in 1603 he had the emperor formally appoint him shogun, founding what World History Encyclopedia calls "the third warrior government in Japanese history," the Tokugawa or Edo bakufu.
Why it matters
Sekigahara is often called the most consequential battle in Japanese history because its outcome fixed Japan's ruling house for the next 268 years, until the Meiji Restoration. The peace the Tokugawa shogunate then imposed let Japan turn inward, closing itself off from most foreign contact for over two centuries under the sakoku policy.
How we know
Sekigahara's date, commanders, and outcome are documented across multiple period Japanese chronicles and corroborated by Tokugawa-era administrative records recording the redistribution of land to Ieyasu's allies after the victory.
Sources
- World History Encyclopedia. Tokugawa Ieyasu · Reputable sourceworldhistory.org · The domain "worldhistory.org" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
- Nippon.com. The Battle of Sekigahara: A Fight for the Future of Japan · General sourcenippon.com · Cited as a "news" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
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