Sekigahara Decides Japan: Tokugawa Shogunate Begins

More than 160,000 samurai clashed on a fog-shrouded plain in Mino Province on October 21, 1600, in what became the largest and most consequential battle in Japanese history. Tokugawa Ieyasu, the cunning daimyo of eastern Japan, had spent years cultivating alliances and waiting for the right moment to seize supreme power. At Sekigahara, he got it. The opposing Western Army, nominally led by Ishida Mitsunari but composed of a fragile coalition of lords loyal to the young heir of the recently deceased Toyotomi Hideyoshi, outnumbered Tokugawa's Eastern Army on paper. But Ieyasu had secretly secured the defection of several key Western generals before a single arrow was loosed. When the battle began in dense morning fog, the Western forces initially held their ground. The turning point came when Kobayakawa Hideaki, commanding a reserve of 15,000 troops on a hillside overlooking the battlefield, switched sides and attacked the Western flank. The coalition collapsed within hours. Mitsunari fled but was captured days later and executed in Kyoto alongside two other Western commanders. Ieyasu redistributed the domains of defeated lords, rewarding allies and punishing enemies across the entire archipelago. Within three years, he received the title of shogun from the emperor, formalizing what Sekigahara had already decided by force. The Tokugawa shogunate that emerged would govern Japan for 268 years, enforcing a rigid social hierarchy, closing the country to nearly all foreign contact, and presiding over an era of remarkable internal peace. The battle ended a century of near-constant civil war and shaped Japanese society until Commodore Perry's warships forced the country open in 1853.