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Battles, incidents, and historical events related to Japanese swords
97 events
August 1532 CE (Tenbun 1)
In August of Tenbun 1 (1532), the allied forces of Hosokawa Harumoto, Rokkaku Sadayori, and the Hokke Ikki (Lotus Sutra league) burned and destroyed Yamashina Hongan-ji, the headquarters of the Ikko Ikki, in a decisive engagement of the Eishoku-Tenbun Disturbance (1531–1535). This event paved the way for the Hongan-ji's relocation to Osaka and the subsequent Ishiyama Conflict.
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Autumn, Tenbun 9 (1540)
In autumn 1540, at Kōriyama Castle in Aki Province (present-day Akitakata City, Hiroshima Prefecture), Mōri Motonari repulsed a massive invasion by Amako Haruhisa of Izumi Province. Vastly outnumbered, Mōri's defense and counterattacks forced the Amako withdrawal, marking the turning point in Mōri's rise to dominate the Chūgoku region.
October 23, 1538 (Tenbun 7, 10th month, 7th day)
A 1538 battle at Kōnodai in Shimōsa Province between the allied forces of Ashikaga Yoshiaki, head of the Koyumi Kubō, and Satomi Yoshitaka against Hōjō Ujitsuna and his son Ujiyasu of the Later Hōjō. Yoshiaki's death in battle ended the Koyumi Kubō line and opened the way for Hōjō expansion into Shimōsa.
July 1536 (Tenbun 5)
In July 1536, warrior-monks of Enryaku-ji on Mt. Hiei, backed by Rokkaku Sadayori's forces, burned all twenty-one Hokke (Nichiren) temple compounds in Kyoto. The resulting destruction surpassed even the Ōnin War, and the Hokke faithful were expelled from the capital for six years — a vivid example of the interplay between religion, armed force, and daimyo power in the Sengoku age.
A series of incidents from 1535 (Tenbun 4) to c. 1579 (Tenshō 7)
Blades by the Muramasa school of Ise-Kuwana became associated with a chain of wounds and deaths said to have befallen four generations of the Tokugawa house—Kiyoyasu, Hirotada, Ieyasu, and Nobuyasu—giving rise during the Edo period to the legend of the "sword that curses the Tokugawa." The blades’ genuine reputation for sharpness and their wide circulation in the Tōkai region likely underlie the legend’s formation.
9th month, 1st day, Tenbun 20 (September 30, 1551)
In 1551, Ouchi retainer Sue Harukata overthrew his lord Ouchi Yoshitaka, forcing the great patron of western Japan's sword culture to commit suicide at Daineiji temple. The Ouchi clan's fall ended the organized Japan–Ming sword trade and scattered its patronized swordsmiths across western Japan.
Tenbun 18 (1549)
Miyoshi Nagayoshi defeated Hosokawa Harumoto at the Battle of Eguchi and came to dominate the Kinai region. He established authority surpassing even the Muromachi shogun, realizing the position of 'tenka-hito' (ruler of all Japan) before Oda Nobunaga. He also contributed significantly to the expansion of sword culture's distribution and demand.
March 19, 1548 (Tenbun 17)
On March 19, 1548 (Tenbun 17), the forces of Oda Nobuhide of Owari clashed with the allied Imagawa–Matsudaira army—commanded by the Imagawa strategist-monk Taigen Sessai—at Azukizaka in Mikawa Province (present-day Okayama-chō, Okazaki City, Aichi Prefecture). The battle arose from the contest between the Oda and Imagawa clans for control of Mikawa Province, centered on guardianship of the young Matsudaira Hirotada, lord of Okazaki Castle. The Imagawa victory secured their dominance over Mikawa and set the stage for the young Tokugawa Ieyasu's years as an Imagawa hostage.
February, Tenbun 17 (1548)
In February 1548, Takeda Shingen suffered one of his most severe defeats at the hands of Murakami Yoshikiyo at Udahara in Shinano Province. Shingen was wounded in the right thigh by an arrow and forced to withdraw, while two of his most trusted generals—Itagaki Nobukata and Amari Torayasu—were killed in the battle.
May 19, 1546 (20th day, 4th month, Tenbun 15)
In 1546, Hōjō Ujiyasu launched a daring night assault with only 8,000 men against an 80,000-strong besieging coalition — the greatest surprise battle in the Kantō region. Crushing the combined forces of Uesugi Tomosada and Ashikaga Haruuji, Ujiyasu established Hōjō supremacy over the Kantō plain and cemented his reputation as one of the era's greatest commanders.
August 25, Tenbun 12 (September 23, 1543 CE)
In 1543, Portuguese traders aboard a Chinese junk were shipwrecked on Tanegashima island (present-day Kagoshima Prefecture), bringing the first matchlock firearms to Japan. Lord Tanegashima Tokitaka purchased two guns, and local metalworker Yaitabe Kinbee successfully reproduced them within months. The rapid spread of firearms fundamentally transformed Sengoku-era warfare, culminating in Oda Nobunaga's organized deployment of arquebusiers at the Battle of Nagashino (1575). The arrival of firearms marked a turning point from the age of individual sword-wielding valor to massed infantry and ranged weaponry.
June 1542 (Tenbun 11) – September 1548 (Tenbun 17)
From 1542 to 1548, Date clan head Date Tanemune and his son and heir Harumune clashed over succession and foreign alliance policy, escalating into a six-year war that split the daimyo of the Ōu region into two camps. Mediation by shogun Ashikaga Yoshiteru brought peace; Harumune relocated the clan's base to Yonezawa Castle and reorganized its rule, laying the groundwork for Date Masamune's later unification of Ōshū.
June 28, Genki 1 (July 30, 1570)
In June of Genki 1 (1570), the allied forces of Oda Nobunaga and Tokugawa Ieyasu clashed with those of Azai Nagamasa and Asakura Yoshikage in a pitched battle at the banks of the Anekawa River in Ōmi Province. The fierce efforts of Tokugawa Ieyasu's retainer Sakakibara Yasumasa and others turned the tide of battle, and the Oda-Tokugawa forces achieved victory. This battle accelerated the collapse of the Azai-Asakura alliance.
April, Genki 1 (1570)
In April 1570, Oda Nobunaga invaded Echizen Province to attack Asakura Yoshikage. When his ally Azai Nagamasa unexpectedly betrayed him, cutting off his retreat, Nobunaga executed a desperate fighting withdrawal — the famous 'Kanegasaki Withdrawal'. Kinoshita Hideyoshi commanded the rear guard that held off the pursuing Asakura-Azai forces long enough for Nobunaga to reach safety.
1570–1580 (Genki 1 – Tenshō 8)
From 1570 to 1580, the Ishiyama Hongan-ji — the headquarters of Jōdo Shinshū Buddhism on the site of present-day Osaka Castle — resisted Oda Nobunaga's forces for nearly a decade. The fortress-temple's armed adherents (ikki) held out against repeated assaults and naval blockades until an imperial-mediated truce ended the conflict. The longest siege of the Sengoku period.
April 12, Genki 4 (May 13, 1573)
In 1573, Takeda Shingen, the daimyo of Kai who was advancing toward Kyoto in the Saikō Campaign after crushing Tokugawa Ieyasu at Mikatagahara, fell fatally ill during the siege of Noda Castle and died at Komaba in Shinano Province at age 53 while retreating to Kai. His death collapsed the anti-Oda coalition and set the stage for the Takeda clan's later defeat at Nagashino and eventual destruction.
May 4, Genki 3 (June 5, 1572 CE)
In the third year of Genki (1572), in Hyūga Province (present-day Miyazaki Prefecture), the Shimazu army under Shimazu Yoshihiro defeated the Itō army under Itō Yoshisuke through brilliant stratagem. With a small force, Shimazu Yoshihiro employed the tsurino-buse tactic to annihilate an Itō army more than three times their size, achieving a decisive victory in the struggle for hegemony between Satsuma and Hyūga. Through this battle, Yoshihiro's martial fame spread widely, and Shimazu clan control of Hyūga was firmly established. Called 'Hyūga's Okehazama,' this is the most important battle in the military history of Satsuma, Ōsumi, and Hyūga.
1572–1575 (Genki 3 – Tenshō 3)
From Genki 3 (1572) to Tenshō 3 (1575), the Takeda and Oda clans contested control of Iwamura Castle in Mino Province. Female castle lord Lady Otsuya sought to protect the castle through marriage to Takeda strategist Akiyama Torashige, but after the Battle of Nagashino, Oda forces retook the castle, and both Torashige and Otsuya were executed.
May 1615 (4th–5th month, Keichō 20)
In May 1615, Tokugawa Ieyasu crushed the Toyotomi clan in the final campaign of Japan's unification. Sanada Yukimura's suicidal charge against Ieyasu's headquarters became legendary, earning him the title 'Japan's greatest warrior.'
October–December 1614 (9th–12th month, Keichō 19)
From October to December 1614, Tokugawa Ieyasu besieged Osaka Castle, held by Toyotomi Hideyori. Sanada Yukimura's celebrated fortification, the Sanada-maru, repulsed repeated Tokugawa assaults. Ultimately ending in a negotiated peace that stripped the castle's outer defenses, the campaign set the stage for the decisive Summer Campaign of 1615.
October 21, 1600 (Keichō 5, 9th month, 15th day)
On October 21, 1600, the decisive battle of Japan's unification was fought at Sekigahara in Mino Province. The Eastern Army under Tokugawa Ieyasu clashed with the Western Army under Ishida Mitsunari, determining Japan's hegemon in a single day.
September 2, 1600
In the 7th month of 1600, on the eve of Sekigahara, Tokugawa Ieyasu convened a war council at Oyama in Shimotsuke Province. Securing the loyalty of eastern lords including Fukushima Masanori, he pivoted from the Aizu campaign to confronting the Western Army — a turning point that determined the fate of Japan.
January 1597 – December 1598
In Keichō 2 (1597), after four years of cease-fire following the Bunroku Campaign, Toyotomi Hideyoshi dispatched a massive army to Korea once more. Notable for the siege of Ulsan Castle (under Katō Kiyomasa) and Shimazu Yoshihiro's desperate breakthrough at the Battle of Noryang, this campaign documents the reality of early-modern warfare where Japanese swords and firearms coexisted. Following Hideyoshi's death from illness, the war lost its objective and the entire army withdrew, inflicting catastrophic human and cultural damage on the Korean Peninsula.
April–August 1590 (3rd–7th month, Tenshō 18)
In Tenshō 18 (1590), Toyotomi Hideyoshi led a large army to besiege the Go-Hojo clan's headquarters at Odawara Castle. After a prolonged siege lasting over three months, Ujimasa and Ujinao (father and son) of the Go-Hojo clan surrendered. Ujimasa committed suicide, and the Go-Hojo clan that had endured for 100 years perished. This was the historical event that completed Hideyoshi's unification of Japan.