The castle that Oda Nobunaga had named after the cradle of Chinese civilization fell before nightfall. Gifu Castle (Gifu-jō), the mountain fortress above the Nagara River in Mino Province, was more than a military position. Nobunaga had renamed it himself — taking the characters of the Zhou dynasty's founding city in China — as a declaration that his ambitions were not merely Japanese. From Gifu, he had received Jesuit missionaries. From Gifu, he had launched the campaigns that shattered the old order. The name itself was a manifesto.

On the 23rd day of the seventh lunar month, Keichō 5 — late September 1600 by the Western calendar — eastern forces under Ikeda Terumasa and Fukushima Masanori struck the castle. Ikeda was Tokugawa Ieyasu's (Tokugawa Ieyasu's) son-in-law. Fukushima, 39 years old, was one of the Seven Spears of Shizugatake — Hideyoshi's most celebrated warriors — and a veteran of the brutal Korean campaigns. Both men were experienced, motivated, and moving fast.

The outer defenses broke in hours. The lower city fell. The entire fortress, except the main tower, was overrun before the day ended. Inside, Oda Hidenobu, twenty years old and the grandson of the man who had made Gifu legend, prepared for death. In samurai culture, the fall of a castle — rakujō (rakujō) — was a lord's final moment. The defender either died in the fire or died by his own hand.

But Hidenobu was talked out of it. The men who had just dismantled his world persuaded him to surrender instead. He was eventually exiled to a Zen temple, where he died in 1605 at the age of approximately 25 — the Oda main line extinguished not in one of history's famous last stands, but quietly, in a monastery garden, five years after the last gate fell.

The military impact was immediate. Ishida Mitsunari had planned to delay Ieyasu's eastern generals, wear down their momentum, and hold the road west while he consolidated the coalition. Gifu was supposed to be part of that holding action. Its fall in a single day shattered the timetable. Western lords who had been watching from the margins, waiting to see whether Mitsunari's strategy could hold, now saw the road crumbling. Ogaki Castle, Mitsunari's main stronghold in the theater, suddenly looked exposed.

The speed of the fall was itself the message: Ieyasu's advance was not a probe. It was a campaign, and it was moving faster than anyone in the west had planned for.