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Gunomi-midare and suguha are found to have taken its place. The hamon (line of temper) is similar to that of the tachi, except for the absence of choji-midare, which is nioi and utsuri. The introduction of the Hachiman faith became visible in the carvings in the tantō hilts around this time. Because of the style introduced by the tachi in the late Kamakura period, tantō began to be forged longer and wider. Near the middle of the Kamakura period, more tantō artisans were seen, increasing the abundance of the weapon, and the kanmuri-otoshi style became prevalent in the cities of Kyoto and Yamato. With the beginning of the Kamakura period, tantō were forged to be more aesthetically pleasing, and hira and uchi-sori tantō were the most popular styles for wars in the kamakura period. The tantō was invented partway through the Heian period, when it was mainly used as a weapon. Tantō by Hyūga Masamune, 24.8cm, Unsigned Masamune, Formerly in the possession of Ishida Mitsunari who gave this sword to the husband of his younger sister the sword was stolen during the Battle of Sekigahara by Mizuno Katsushige, governor of Hyūga Province, Kamakura period, around Shōō to Karayaku eras (1288–1328), Mitsui Memorial Museum, Tokyo, Japan. History of Tantō in Japan Heian to Muromachi He mentions the custom of leaving the katana at the door of a castle or palace when entering while continuing to wear the wakizashi inside. Kanzan Satō in his book The Japanese sword notes that there did not seem to be any particular need for the wakizashi and suggests that the wakizashi may have become more popular than the tantō due to the wakizashi being more suited for indoor fighting. With the advent of the katana, the wakizashi eventually was chosen by samurai as the short sword over the tantō. It has been noted that the tachi would be paired with a tantō and later the uchigatana would be paired with another shorter uchigatana. Before the advent of the wakizashi/tantō combination, it was common for a samurai to carry a tachi and a tantō as opposed to a katana and a wakizashi. Tantō were sometimes worn as the shōtō in place of a wakizashi in a daishō, especially on the battlefield. Women sometimes carried a small tantō called a kaiken in their obi primarily for self-defense. Tantō were mostly carried by samurai, as commoners did not generally wear them. Some tantō have particularly thick cross-sections for armor-piercing duty, and are called yoroi toshi. Tantō are generally forged in hira-zukuri style (without ridgeline), meaning that their sides have no ridge line and are nearly flat, unlike the shinogi-zukuri structure of a katana. The tantō was designed primarily as a stabbing weapon, but the edge can be used for slashing as well. The blade is single or double edged with a length between 15 and 30 cm (6-12 inches, in Japanese 1 shaku). The tantō is commonly referred to as a knife or dagger.