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Battles, incidents, and historical events related to Japanese swords
214 events
1350–1352 (Kannō 1–2)
From Kan'nō 1 to 3 (1350–1352), an internal conflict within the Muromachi shogunate between Ashikaga Takauji and his younger brother Ashikaga Tadayoshi. Takauji's administrator Kō no Moronao clashed fiercely with Tadayoshi, but after Moronao's execution, Takauji and Tadayoshi reconciled; however, Tadayoshi was subsequently poisoned, ending the conflict. The greatest internal strife of the shogunate, further complicating the tumult of the Northern and Southern Courts.
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July 10, 645 CE (Kōgyoku 4)
In the 6th month of 645, Prince Naka no Ōe and Nakatomi no Kamatari assassinated Soga no Iruka within the court. One of the earliest documented political assassinations using ancient Japanese straight swords, it is a pivotal event in the history of the sword's origins.
November 9, 1180 (20th day, 10th month, Jishō 4)
In the 10th month of Jishō 4 (1180), at the Fuji River in Suruga Province, the eastern warrior coalition under Minamoto no Yoritomo routed the pursuing Taira force led by Taira no Koremori. The Taira army's legendary flight at the sound of startled waterbirds masked the real significance: the rapid consolidation of Kantō warriors behind Yoritomo, establishing the foundation of what would become the Kamakura shogunate.
August 23, 1180 (Jishō 4)
On August 23, 1180 (Jishō 4), Minamoto no Yoritomo, having just raised his banner in Izu, suffered a crushing defeat at Ishibashiyama in Sagami Province against the far larger Taira-aligned army of Ōba Kagechika. Yoritomo narrowly escaped with his life to Awa Province, rallied the warriors of the eastern provinces, and entered Kamakura that October. This defeat — said to be the only one of his career — proved the turning point toward the founding of the Kamakura shogunate.
c. 1180–1192 CE (Jishō 4 – Kenkyū 3)
From the Jisho-Juyei Rebellion (1180–1185) through the Bunji and Kenkyū eras (1185–1199), the imperial insei rule centered on the aristocratic court collapsed, and the samurai regime under Minamoto Yoritomo as shogun (the Kamakura Shogunate) fundamentally transformed Japan's system of rule. This was the historical transition period in which the Japanese sword became institutionalized as the symbol of the warrior's soul, authority, and official rank.
c. Eiroku period (1558–1570)
During the Eiroku period (1558–1570), Kamiizumi Ise-no-Kami Nobutsuna (born c. 1508) created Shinkage-ryū by developing and transforming the older Kage-ryū. He invented the fukuro shinai (a split-bamboo practice weapon wrapped in a leather sleeve), revolutionizing sword training, and systematized the philosophy of the "living sword" (katsujinken)—subduing rather than killing. In 1564 he performed before Shōgun Ashikaga Yoshiteru, and later transmitted the innermost teachings to Yagyū Munetoshi (Sekishūsai), who became the founder of the Yagyū Shinkage-ryū.
19th day, 5th month, Eiroku 8 (June 17, 1565)
The Eiroku Incident (May 19, Eiroku 8, corresponding to 1565) was an attack on the residence of Shogun Ashikaga Yoshiteru by the forces of the Miyoshi Sanningumi and Matsunaga Kutsū, resulting in Yoshiteru's death. Yoshiteru is said to have planted multiple celebrated blades into the floor, and as each blade became slippery with blood, he continuously switched to the next sword while fighting to the very end. Known as the most dramatic death intertwined with swords in Japanese history, this event symbolizes the life of Yoshiteru, acclaimed as the "Swordmaster Shogun."
Eiroku 8–9 (1565–1566)
From Eiroku 8 (1565) through the following year, Mōri Motonari besieged and conquered Gassan-Toda Castle, the seat of the Amago clan in Izumo Province. Through a starvation siege lasting over a year, Motonari reduced the famously impregnable Gassan-Toda Castle and established hegemony over the Chūgoku region. The Amago clan was annihilated and Izumo became Mōri territory.
3rd day of the 1st month, Eiroku 7 (January 1564)
On the 3rd of January, Eiroku 7 (1564), the Later Hōjō forces led by Hōjō Ujiyasu and his son Ujimasa routed the army of Satomi Yoshihiro at Kokufu-dai (present-day Ichikawa City, Chiba Prefecture) in Shimofusa Province. This battle halted the Satomi's invasion of Kazusa and firmly established Later Hōjō dominion over the Kantō region, marking a critical turning point in Sengoku-period history of eastern Japan.
1st–5th months, Eiroku 12 (February–June 1569)
From January to May in the 12th year of Eiroku (1569), Tokugawa Ieyasu besieged Kakegawa Castle in Tōtōmi Province, where Imagawa Ujisato was garrisoned. Having lost his father Yoshimoto in the Battle of Okehazama (1560), Ujisato held Kakegawa Castle, his last stronghold, as the Imagawa domain collapsed under Takeda Shingen's invasion (1568). Ultimately, Ujisato surrendered and opened the castle, and the illustrious Imagawa clan lost its standing as a warring state daimyo. The fate of Ujisato, known for preferring poetry and kemari to warfare, reflects the cruel reality of sword culture in the aristocratic struggle for supremacy.
October, Eiroku 12 (1569)
In October 1569, as Takeda Shingen's forces withdrew from their raid on Odawara Castle, Hojo troops pursued them through the mountains of Sagami Province. At Mimasetoge Pass (present-day Aiko District, Kanagawa Prefecture), the Takeda rear-guard turned and shattered the pursuing Hojo forces, with the red-armored cavalry of Yamaga Masaage playing a celebrated role.
Tenth month (22nd), Eishō 14 (1517)
The Battle of Arita-Nakaide in Aki Province in Eishō 14 (1517) is famed as the first battle of the young Mōri Motonari. When Takeda Motoshige—former shugo of Aki, backed by the Amago—attacked the Kikkawa-held Arita Castle, the allied Mōri-Kikkawa forces met him in the field. The outnumbered allies slew the Takeda's valiant general Kumagai Motonao and then felled the commander Takeda Motoshige himself with a stray arrow, winning a great victory. It is called "the Okehazama of the West."
1083–1087 (Eiho 3 – Kanji 1)
From 1083 to 1087, a struggle for dominance in the northeast erupted in Mutsu and Dewa provinces. Minamoto Yoshiie intervened in the internal strife of the Kiyohara clan and established supremacy by capturing Kanazawa Stockade. As one of the two great wars of the northeast alongside the Earlier Nine Years' War, it established the martial authority of the Minamoto and created the 'tradition of Oshu warfare.'
1438–1439 (Eikyō 10–11)
From Eikyo 10–11 (1438–1439), Ashikaga Yoshinori, 6th shogun of the Muromachi bakufu, waged a campaign to subjugate Ashikaga Mochiunji, the Kamakura kubō. Yoshinori opposed Mochiunji's increasingly independent stance, while Kanto Kanrei Uesugi Norizane clashed with Mochiunji. Uesugi forces, backed by bakufu troops, achieved victory, and Mochiunji committed suicide, ending the independent Ashikaga regime in Kanto.
August 1428 – 1429 (Shōchō 1–2)
In August of Shōchō 1 (1428), a large-scale land uprising—the first of its kind in Japanese history—spread across Kyoto and the Kinai region, triggered by a bashaku (transport worker) uprising in Ōmi. Peasants and bashaku demanded tokusei (debt cancellation) and attacked pawnshops and sake merchants. The shogunate attempted to suppress the uprising through Akamatsu Mitsusuke, but in Nara, Kōfukuji Temple recognized tokusei. This was a landmark event marking the first emergence of organized collective armed action by the common people in history.
1955 – present
In Showa 30 (1955), the Japanese government established the system for Important Intangible Cultural Property Holders, commonly known as "Living National Treasures." Japanese sword forging technique was designated as a target category from the outset, with Takahashi Sadatsugu (1955) and Miyairi Akihira (designated 1963) selected as the first recipients. This system represented the state's highest recognition of Japanese sword smith technology, which had been formally designated as "Cultural Property" following the post-war crisis of GHQ confiscation. Subsequently, successive Living National Treasures—including Amata Akitsugu, Sumitani Masamine, and Miyairi Norihiro—carried forward the tradition and established the foundation of modern sword culture.
June 1951
Around the time of the signing of the San Francisco Peace Treaty in June 1951, private activities surrounding Japanese swords rapidly intensified. As restrictions imposed during the GHQ occupation began to ease, sword preservation societies and museum exhibitions proliferated across Japan, laying the foundation for postwar sword collecting culture. Organizations including the Society for the Preservation of Japanese Art Swords (NBTHK) were established and strengthened, advancing the transmission of sword-making techniques and systematizing aesthetic authentication.
February 1948 (Showa 23)
In February 1948, during the Allied occupation of Japan, the Society for the Preservation of Japanese Art Swords (Nihon Bijutsu Token Hozon Kyokai, NBTHK) was established to counter the mass destruction of swords under GHQ's weapons confiscation orders. By repositioning Japanese swords as art objects rather than weapons, the organization created a legal and cultural framework that saved tens of thousands of blades from destruction. It remains the central institution for Japanese sword authentication, preservation, and promotion.
August 1945 – 1948
In August 1945, GHQ ordered the confiscation of all weapons across Japan, threatening hundreds of thousands of Japanese swords with destruction. The campaign by sword scholars and cultural figures to argue that swords were art objects — not weapons — resulted in the founding of the Society for the Preservation of Japanese Art Swords (NBTHK) in 1948, establishing the legal and cultural framework that protects Japanese swords to this day.
1945–1946 (Showa 20–21)
Between late 1945 and 1946 (Showa 20-21), the Honjo Masamune—a sword treasured by the Tokugawa clan and among the finest blades in Japanese sword history—disappeared after being seized by the GHQ (General Headquarters of the Supreme Commander for the Allied Powers). A national-treasure-class sword said to have been forged by the legendary swordsmith Masamune of the Kamakura period (founder of the Soshu tradition) was permanently lost amid the postwar confusion, and its whereabouts remain unknown to this day.
December 1938
In December 1938, a sword smith certification system was established through coordination between the military and cultural administration, formally positioning Japanese sword production as a state-recognized craft. The system was designed to protect and transmit the skills of sword smiths that had declined under Westernization policies since the Meiji Restoration. Though it emerged in a wartime context, this institutional framework also laid the groundwork for the postwar system of certified sword smiths.
December 1868 – May 1869 (Meiji 1–2)
In 1869, the last battle of the Boshin War was fought at Goryōkaku fortress in Hakodate, Hokkaido. Enomoto Takeaki and Hijikata Toshizō led the remnant shogunate forces against the new Meiji government army. Hijikata died from a bullet wound in the final days. As one of the last large-scale organized battles involving Japanese swords, Hakodate stands at the threshold of tradition and modernity.
March 28, 1876 (Meiji 9)
On March 28, 1876 (Meiji 9), the Grand Council of State issued Proclamation No. 38 — the Haitōrei (Sword Abolition Edict) — banning all persons except military and police from wearing swords in public. This single decree removed from the streets the blade that had symbolized samurai identity for over a millennium, triggered the fury of the shizoku warrior class, and directly ignited the Satsuma Rebellion of 1877. It also marked the beginning of modern Japanese sword culture, transforming the katana from weapon to art object and cultural heritage.
On March 28, 1876 (Meiji 9), the Grand Council of State issued Proclamation No. 38—the Haitōrei (Sword Abolition Edict)—formally titled "Prohibition of Sword-Wearing Except in Court Dress and by Military, Police, and Officials in Uniform." This decree abolished at a stroke a privilege enjoyed by the samurai class for over a millennium. Combined with the Chitsuroku Shobun (abolition of hereditary stipends) implemented the same year, the edict destroyed the economic and symbolic foundations of the shizoku class, ignited the Satsuma Rebellion of 1877, and simultaneously launched the transformation of the Japanese sword from weapon into art object and collectible.