Tokugawa Forces Win Battle of Sekigahara
Japan's Sengoku period of civil war neared its end after the death of unifier Toyotomi Hideyoshi left his young son as nominal heir amid factional rivalries. Eastern daimyo loyal to Tokugawa Ieyasu clashed with a Western coalition backing the Toyotomi cause, led by Ishida Mitsunari. On October 21, 1600, roughly 160,000 warriors met on the foggy fields near Sekigahara in central Japan. Key defections during the fighting, including by Kobayakawa Hideaki, shifted momentum decisively toward Ieyasu's side. The Eastern Army's victory eliminated major opposition and paved the way for Ieyasu's appointment as shogun three years later.
Why it matters: The battle ended the Sengoku era of constant warfare and established the Tokugawa shogunate, which governed Japan in relative peace and isolation for over 250 years until the Meiji Restoration. It centralized power under the Tokugawa clan and shaped Japan's feudal structure and foreign policy for generations.