Changes

   

   

====Late Kamakura (1288 -1333)====

====Late Kamakura (1288 -1333)====

The Mongolian invasions attempt of 1274 and 1281 greatly influenced the Japanese sword. Until this period the method of battle in Japan was based on single duels, with rituals as  exchanging names and genealogies each other before fight with no organized formations and tactics. On the contrary Mongolians attacked suddenly in organized formations following tactics. Moreover, their armor were tough and they used weapons which Japanese have never seen before as gunpowder hand-grenades and rockets. Their armors were light and they could move fast. After that the Japanese armors became to be lighter and sword's shape  changed to make them able to chop the light armor without being entrapped and then broken in them.  

The Mongolian invasions attempt of 1274 and 1281 greatly influenced the Japanese sword. Until this period the method of battle in Japan was based on single duels, with rituals as  exchanging names and genealogies each other before fight with no organized formations and tactics. On the contrary Mongolians attacked suddenly in organized formations following tactics. Moreover, their armor were tough and they used weapons which Japanese have never seen before as [[gunpowder]] hand-grenades and rockets. Their armors were light and they could move fast. After that the Japanese armors became to be lighter and sword's shape  changed to make them able to chop the light armor without being entrapped and then broken in them.  

The former blade was Hamaguri-ba. When you chop a hard thing, Hamaguri-ba is suitable, but the armors began to be light and thin in this period. So the blade in this period became to be thin compared with the one of former period. And Kissaki became to be  

The former blade was Hamaguri-ba. When you chop a hard thing, Hamaguri-ba is suitable, but the armors began to be light and thin in this period. So the blade in this period became to be thin compared with the one of former period. And Kissaki became to be  

'''Chu-Kissaki''' (medium length). That is, Kissaki got longer because when Ikubi-Kissaki was damaged, no room for restoration was available. When you stab the enemy, Chu-Kissaki is suitable. Ikubi-Kissaki was wider then Chu-Kissaki. '''Mihaba''' ( width ) becomes to be narrow. This shape looks like the refined one of the first stage of Kamakura, but Kissaki in this period is bigger and the center of Sori moved up. In this way, if the edge became to be thin, strength of the blade decrease. Therefore, you have to make Mihaba wide and if Mihaba become wide, Kissaki become to be bigger. The peak like this change is Odanbira in the next Northern and Southern Dynasties.  

'''Chu-Kissaki''' (medium length). That is, Kissaki got longer because when Ikubi-Kissaki was damaged, no room for restoration was available. When you stab the enemy, Chu-Kissaki is suitable. Ikubi-Kissaki was wider then Chu-Kissaki. '''Mihaba''' ( width ) becomes to be narrow. This shape looks like the refined one of the first stage of Kamakura, but Kissaki in this period is bigger and the center of Sori moved up. In this way, if the edge became to be thin, strength of the blade decrease. Therefore, you have to make Mihaba wide and if Mihaba become wide, Kissaki become to be bigger. The peak like this change is Odanbira in the next Northern and Southern Dynasties.