Battle of Tedorigawa

The Battle of Tedorigawa — Kenshin's Final Great Victory

On September 23, Tensh 5 (1577) — November 3 by the modern calendar — at the Tedorigawa River in Kaga Province (present-day area between Hakusan and Nomi cities, Ishikawa Prefecture), the Echigo forces under Uesugi Kenshin defeated the great army of Oda Nobunaga. This "Battle of Tedorigawa" was Kenshin's greatest victory in his final major military engagement and the moment when Kenshin, lauded as the "Dragon of Echigo" and the "God of War," reached the zenith of his martial authority.

At this time, Nobunaga was compelled to confront three fronts simultaneously in his unification: the west (Mōri clan), the east (post-Takeda), and Hokuriku (Uesugi clan). It is not difficult to imagine that Nobunaga's sense of crisis intensified when faced with the formidable rival Uesugi Kenshin exerting pressure from Hokuriku and inflicting this catastrophic defeat at Tedorigawa. Yet in March of the following year, 1578, Kenshin died suddenly. This "what if of history" — how would Japan's unification history have diverged had Kenshin lived? — remains transmitted as an eternal enigma.

The Battle's Background — Kenshin's Plan to Advance on the Capital and Expand into Hokuriku

In 1576 (Tensh 4), Uesugi Kenshin received requests from the Hongan-ji Temple and the Mōri clan to join their coalition against Nobunaga, and resolved to march toward the capital (Kyoto). From this year forward, Kenshin launched major military campaigns into Hokuriku, progressively subduing the provinces of Kaga and Noto.

In September 1577, after capturing Nanao Castle (present-day Nanao city, Ishikawa Prefecture) — the stronghold of the Hatakeyama clan in Noto — Kenshin entered it with measured deliberation, as if announcing his conquest to Nobunaga. Nanao Castle was a pivotal step in Kenshin's mastery of Hokuriku. In response, Nobunaga dispatched a massive army of approximately fifty thousand troops under the supreme command of Shibata Katsuie, reinforced by powerful generals including Hashiba Hideyoshi, Takigawa Kazumasu, and Maeda Toshiie.

The Ambush at Tedorigawa — The Essence of Kenshin's Military Genius

The Oda army advancing into Kaga Province believed Kenshin's forces were positioned toward Nanao Castle and proceeded by crossing the Tedorigawa River. Yet at the precise moment of the crossing, Kenshin's elite troops launched a devastating assault.

No military force is more vulnerable than one mid-crossing. With its formations split between riverbanks, retreat routes severed, and terrain advantages nullified, the Oda army descended into chaos when struck by the surprise assault. Kenshin's cavalry descended upon the riverbanks and successively cut down Oda troops in transit and in the aftermath. The river is said to have been dyed red with blood.

Though Shibata Katsuie and Hashiba Hideyoshi narrowly escaped, the Oda army's losses were staggering. In response to this catastrophic defeat, Nobunaga reportedly wrote that "all matters proceed according to heaven's way" — when the hegemon of unification wrote that he left matters to "heaven's will," these words revealed his fear and anxiety regarding Kenshin.

Kenshin's Swords — The Celebrated Blades Beloved by the Dragon of Echigo

Concerning the swords wielded by Uesugi Kenshin, several traditions are recorded. As one of the Sengoku period's mightiest commanders alongside Takeda Shingen, interest in his arms remains unfading.

Particularly renowned among Kenshin's favored blades are two weapons: the "Kenshin Kagemitsu" and the "Yamatorigemon" (also known as Yamanbu). The Kenshin Kagemitsu is housed at the Saitama Prefectural Museum of History and Folklore, while the Yamatorigemon resides at Okayama Prefecture's Bizen Osafune Sword Museum, both celebrated as swords intimately associated with Uesugi Kenshin.

The "Kenshin Kagemitsu" is attributed to Kagemitsu, a renowned smith of Bizen Osafune, and represents a fine short sword from the late Kamakura period. Kenshin's use of it gave it the name "Kenshin Kagemitsu." The "Yamatorigemon," attributed to Ichimonji Yoshifusa, derives its name from the exquisite feather-like grain patterns on its surface steel. Both are designated National Treasures and Important Cultural Properties and stand among the supreme achievements of Japanese sword-crafting.

Kenshin regarded the sword not as a mere weapon but as a sacred instrument through the protection of Bishamonten, the deity of war. Flying his battle standard bearing the character "Bi" for Bishamonten, believing himself the incarnation of Bishamonten, Kenshin saw the sword as embodying the connection between the divine and the warrior.

Kenshin's Sudden Death — History's Greatest "What If"

In the year following the triumph at Tedorigawa, on March 9, Tensh 6 (1578), Uesugi Kenshin collapsed suddenly at Kasugayama Castle (present-day Joetsu city, Niigata Prefecture) and died on the 13th, aged forty-nine. The cause is estimated to have been cerebral stroke.

Kenshin's death creates history's greatest "what if." Had Kenshin lived — had he, who had conquered Hokuriku and was preparing to advance on the capital, been able to strike at Nobunaga's rear — Japan's unification history would have taken an entirely different course. Indeed, had Kenshin survived the year following Tedorigawa, Nobunaga would have faced the catastrophic scenario of simultaneous assault from three directions: east, west, and north.

Following Kenshin's death, the Uesugi clan fractured in the succession dispute known as the Otate no Ran (1578-1579). Though Uesugi Kagekatsu emerged victorious, the military might Kenshin had amassed was severely diminished by internal strife. For Nobunaga, Kenshin's sudden death was divine providence.

The words Nobunaga wrote — "all matters proceed according to heaven's way" — ultimately proved self-fulfilling through Kenshin's death — such is history's irony. The Battle of Tedorigawa endures as the moment that most threatened Nobunaga's unification of Japan, a conflict that shone with the final radiance of the age of the Japanese sword and the samurai.