Battle of Kanegasaki

The Battle of Kanegasaki in April 1570 was Oda Nobunaga's most dangerous moment before Honnōji — a near-catastrophic withdrawal triggered by the sudden betrayal of his ally and brother-in-law Azai Nagamasa. What saved him was the rear-guard action fought by Kinoshita Hideyoshi (later Toyotomi Hideyoshi), whose performance holding off Asakura-Azai pursuit forces entered history as one of the defining moments of his rise.

Nobunaga had crossed into Echizen Province with roughly thirty thousand men to attack Asakura Yoshikage, who had repeatedly refused his summons to Kyoto. The advance went well; Kanegasaki Castle fell early. Then, around April 26, intelligence arrived that Azai Nagamasa — whose marriage to Nobunaga's sister Oichi had been intended to secure the alliance — had activated his older bond with the Asakura and was moving to cut off the Oda retreat route through northern Omi.

The geometry was immediately fatal: Asakura forces ahead, Azai behind. Nobunaga ordered an immediate withdrawal. Speed was everything. With a small bodyguard, he rode for Kyoto via the coastal road while his forces fell back as best they could.

Kinoshita Hideyoshi commanded the rear guard that absorbed the pursuit. Akechi Mitsuhide and Tokugawa Ieyasu were also part of the withdrawal force. The rear guard's mission was to fight, delay, and absorb losses long enough for the main body to reach safety. It was the most dangerous assignment of the campaign.

They succeeded. Nobunaga reached Kyoto. The rear guard survived. The cost was acceptable; the army was preserved; Nobunaga had time to regroup and return. Within two months, he had rebuilt his forces and fought the Azai-Asakura coalition at the Battle of Anegawa.

The Kanegasaki withdrawal shaped the subsequent careers of every major figure present. For Hideyoshi, the rear-guard command was his breakthrough — the moment he demonstrated strategic nerve under pressure and earned Nobunaga's deeper trust. For Mitsuhide, the battle was one of dozens where he served Nobunaga faithfully before their fatal collision twelve years later. For Ieyasu, it was a formative lesson in crisis management.

For sword culture, the Kanegasaki withdrawal is the battle of the rear guard — the chaotic, close-quarters fighting that the sword was built for. The Sōza Samonji, which passed from Imagawa Yoshimoto to Nobunaga at the time of Okehazama and eventually to Hideyoshi, connects all three of these commanders to the blade tradition of the period. Kanegasaki is where their fates first intersected under fire.