Qualla: Nagashino Castle

Nagashino Castle: Introduction

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit First version: Aboshi at Japanese Wikipedia Second version: Mocchy at Japanese Wikipedia, CC BY-SA 3.0. Five hundred men against fifteen thousand. In May 1575, the garrison of Nagashino Castle watched a Takeda army thirty times their number surround the clifftop fortress and begin to dig in. What followed -- the desperate defense, the lone messenger who swam downriver through enemy lines to summon help, and the battle that redefined Japanese warfare -- made this small castle in what is now Shinshiro, Aichi Prefecture, one of the most consequential military sites in Japan. When it was over, the samurai cavalry charge that had dominated battlefields for centuries was broken against wooden stockades and coordinated gunfire. The ruins were designated a National Historic Site in 1929, the first time any former castle site in Japan had received such recognition.

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Image: First version: Aboshi at Japanese Wikipedia Second version: Mocchy at Japanese Wikipedia | CC BY-SA 3.0

Nagashino Castle: The Crossroads Fortress

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit 先従隗始, CC0. Nagashino Castle sits on a cliff above the confluence of the Kansagawa River and the Uregawa River, in the northeastern reaches of modern Shinshiro. The position was not accidental. This spot commanded the crossing where the road from eastern Mikawa Province to southern Shinano P...

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Image: 先従隗始 | CC0

Nagashino Castle: Loyalty Bought and Sold

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit 先従隗始, CC0. The decades before the famous battle were a study in the fragility of feudal allegiance. After the Imagawa clan collapsed at the Battle of Okehazama in 1560, the local Suganuma clan pledged loyalty to Tokugawa Ieyasu. But when Takeda Shingen swept down from Shinano Province and t...

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Image: 先従隗始 | CC0

Nagashino Castle: The Siege and the Swimmer

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit 先従隗始, CC0. In May 1575, Takeda Katsuyori arrived at Nagashino with 15,000 troops. Okudaira Nobumasa had only 500 men behind the castle walls. The Takeda laid siege, and the outcome seemed inevitable. But Okudaira managed to send a messenger -- accounts describe the man swimming downriver th...

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Image: 先従隗始 | CC0

Nagashino Castle: Gunfire Against the Cavalry

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit 先従隗始, CC0. Oda Nobunaga understood that the Takeda cavalry was the most feared striking force in Japan. Rather than meet the charge in the open, he built wooden stockades and positioned his arquebusiers behind them. When the Takeda horsemen thundered forward, they met coordinated volleys of...

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Image: 先従隗始 | CC0

Nagashino Castle: What the Cliff Still Holds

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit 先従隗始, CC0. The castle was never rebuilt as a grand fortress. Its strategic importance faded as the Tokugawa consolidated power and Japan moved toward unification. Today, the ruins stand quiet above the river confluence -- remnants of moats, traces of stonework, and the steep cliff that once...

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Image: 先従隗始 | CC0