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History ・ Beginner
Ten questions on the fundamentals of Japanese sword history: the evolution from straight to curved blades, period characteristics, the Katanagari, the Haitorei, the Kusanagi sword, and swords in battle. All answers are verified against primary sources.
From the mid-Heian period onward (around the Shōhei-Tengyō Rebellion of 939), mounted warriors rose to prominence. A curved blade was easier to draw on horseback and delivered more effective slashing strikes than a straight blade. This led to the adoption of the curved tachi. (Touken World, 'History of Japanese Swords')
The Haitorei was issued on March 28, 1876 (Meiji 9) by the Grand Council of State (Dajō-kan). It prohibited the wearing of swords in public, with limited exceptions for military, police, and ceremonial dress. The Seinan War of 1877 partly reflected samurai discontent over this edict. (National Archives of Japan, 'Japan's Path' – Meiji 9)
Toyotomi Hideyoshi issued the Katanagari edict on July 8, 1588 (Tenshō 16), forbidding farmers from carrying swords and ordering confiscation of weapons. He declared the collected arms would be melted for nails and bolts of the Great Buddha at Hōkōji in Kyoto, and used the edict to enforce separation of the warrior and farming classes. (Wikipedia 'Katanagari')
The Kusanagi-no-Tsurugi (also known as Ama-no-Murakumo-no-Tsurugi) is enshrined as the divine object of Atsuta Jingū in Nagoya, Aichi Prefecture. The other two Imperial Treasures are the Yata no Kagami at Ise Jingū (Naikū) and the Yasakani no Magatama in the Kenjii no Ma at the Imperial Palace. (Official website of Atsuta Jingū)
In the Bunei invasion of 1274, Mongol forces used coordinated group tactics, poisoned arrows, and explosive projectiles (tetsuhau), posing challenges to individual Japanese warriors. This experience prompted improvements in sword construction during the late Kamakura period, influencing greater durability and changes in curvature, and eventually contributed to the appearance of large ōdachi in the Nanbokuchō era. (Touken World, 'Genkō')
The Nanbokuchō period saw widespread fighting by large infantry forces, driving demand for massive ōdachi and nodachi with blades exceeding 3 shaku (approx. 90 cm). These swords were characterized by broad widths and large kissaki (points), a style known as 'ōdachi姿,' which remained admired in later eras. (Touken World, 'Ōdachi/Nodachi')
A tachi was suspended blade-downward from the hip using cords (tachi-o), a practice called 'haku.' An uchigatana was thrust blade-upward through the waist sash, called 'taitō.' From the late Muromachi period onward, as foot-soldier combat became dominant, the uchigatana's fast-draw advantage led it to replace the tachi. (Touken World 'Tachi and Uchigatana Differences'; Hyogo Prefectural Museum of History)
Japanese swords are conventionally classified into four periods: kotō (up to 1596), shintō (1596–1763), shinshintō (1763–1876), and gendaitō (1876–present). The Keichō 1 (1596) boundary originates from the Edo-period scholar Kanda Hakuryūshi, who used the term 'shintō' for swords made from 1596 onward in his 1721 work Arami Meizukushi. (Touken World, 'Kotō/Shintō/Shinshintō/Gendaitō')
Tatara smelting is Japan's traditional ironmaking method using iron sand (satetsu) and charcoal. Tamahagane — the steel of Japanese swords — can only be produced by this technique. The Chūgoku Mountains (especially Okuizumo in Shimane Prefecture) were the leading production region, supplying nearly 90% of Japan's iron in the late Edo/early Meiji period. The tradition is now preserved by the Society for the Preservation of Japanese Art Swords (Nittoho Tatara). (Shimane official tourism site)
The Seinan War (Meiji 10, 1877) was an armed uprising by Satsuma samurai led by Saigō Takamori against the Meiji government, partly driven by discontent over the Haitorei and the abolition of samurai stipends. At the Battle of Tabaruzaka, when rain rendered firearms unusable, Satsuma warriors drew their swords for close combat — marking the last major battlefield use of Japanese swords. (Wikipedia 'Seinan War'; Touken World 'Seinan War')