Recommend the knowledge of knife skills in Japanese mountain cities, such as Taidao, whipping knife, threat difference and short knife.

Mountain city is an inseparable life of samurai, and banning knives is tantamount to forcing them to commit suicide. Japanese samurai's affection for swords can be traced back to before the Tang Dynasty in China. At that time, the art of sword-making in Japan was deeply influenced by the culture of the Central Plains, with straight knives (actually swords) as the mainstay. At first, it imitated the ring-headed straight knife of the Western Han Dynasty, and later it imitated tangdao, which was called "Tang-like broadsword". During the Heian period in Japan, the samurai class began to expand its power. Due to the need of fighting between cavalry and war horses, curved blades with hydrodynamic characteristics and suitable for chopping came into being and gradually became the mainstream. Later, the Yuan Dynasty wiped out the Ping family and established the Kamakura shogunate, which opened the Kamakura era of 150. During this period, Japanese swordsmen gradually improved their smelting methods and quenching techniques, and changed their shapes year by year. Finally, Japanese swordsmanship became independent from the influence of the Central Plains in the early Kamakura period. By the Ming Dynasty, Japanese craftsmen had surpassed China in smelting technology. When Qi Jiguang fought against Japan, it was found that the number of Japanese pirates was small, but it was often difficult for us to deal with them. Finally, I realized that the Japanese aggressors' weapons were far superior to those of the Ming army, so I bought weapons from Japan through secret channels. Even Qi Jiguang's own Dao was changed to a one-handed Dao similar to Japanese Dao, which was later commonly known as Qijia Dao, to counter the long-term border troubles of the Japanese aggressors.

The reason why Japanese sword-making technology is becoming more and more sophisticated is probably related to people's good maintenance of swords and their manufacturing technology. During the Spring and Autumn Period and the Warring States Period, bronze weapons were the best in the world, and there were many amazing works after entering the Iron Age. Our country and people have the habit of being buried with the tomb, so there are few steel weapons handed down from generation to generation, and the ancient bronze weapon smelting method has been lost forever because of the lack of records. On the other hand, in Japan, they rarely have the habit of being buried with the sword, and they are diligent in maintaining the sword. In addition, they also systematically sorted out the forging methods of various departments. The genealogy is as accurate as a dictionary and can be consulted quickly. Long-term and systematic accumulation and exploration eventually led to the rapid development of technology.

Back to Japanese Dao itself, according to its shape and length, it can be divided into Tai Dao, Da Dao, Threat Dao and Short Dao. Taidao and knives with a length of more than 60 cm, and knives with a length of 30 cm to 60 cm are called "threat difference" (also known as middle knife, Gotha ruler, etc. ), and a short knife with a length less than 30 cm (sometimes a knife is attached to the scabbard of the short knife). The standard Tatsu Yamashiro sword configuration should be sword threat, both of which are inserted on the same side of the waist, with the blade facing upwards (hence the so-called "sword drawing"). A good mountain city, first of all, is uniquely designed for the owner, and the length of the knife is directly proportional to the height of the person; Secondly, the smelting of mountain city depends on luck to a certain extent, and it needs to be heated at high temperature and repeatedly broken. In particular, in order to make the cutting edge sharper, it is necessary to use more than two kinds of steel to sharpen it like a razor. Sometimes, a hammer can't pass, which may make the final finished knife useless. Third, the mountain city is composed of a blade and dozens of knife parts, which combines the cooperation of carpenters, metalworkers and painters. The negligence of one link may also cause the deformity of the whole mountain city. Therefore, it is almost impossible to meet such a master of shaking hands in the mountain city, which is why ordinary warriors are extremely reluctant to give up.

The swordsmanship of Japanese samurai (also known as (ancient) kendo) also has an evolution process. At the beginning, after the Yuan Dynasty founded the Kamakura shogunate era with martial arts spirit, the knife method prevailed. After the mid-Muromachi period, it was even more troubled times. Not only samurai, but also ordinary people are competing to practice martial arts, so kendo is becoming more and more popular. The kendo hall for teaching knife skills began to be established, and the knife skills were gradually systematized. From then on, a clear genre name appeared. In the Muromachi era, kendo was called "the art of war". Later, Mr. Musashi Miyamoto (1584- 1645), a swordsman named "bow" in Japanese history, advocated that the "small art of war" should be called the swordsmanship of samurai, and the "big art of war" should be called the general art of war. Personal initiative "two knife flow" attack, never give up. With the shape of Japanese mountain city, it is most suitable for chopping, so the knife method of repainting and chopping like "Flying Heaven and Imperial Sword Flow" is most suitable; However, due to the unique smelting technology of Japanese knives, the mountain city has six sides and six arcs, which can intersect at the tip, and the sharpness of the tip can be imagined. Therefore, the samurai knife method can also take into account the function of puncture. For example, the "trident odontoid process" of natural flow is an exaggerated version of puncture.