Katanas where adopted in the 16th century, when Pike and Shot ( in this time there were estimated seven Times as much firearms in Japan then in Europe) tactis dominated the battlefield although in japan, and became popular in the 17th century, when war was no longer an issue in Japan. In this time the Katana was kept as a statusymbol and duelling weapon like the smallsword in europe. The Martial Arts schools still present today developed in this time when Fights in kimono were normal and Armour No longer an issue.

9:43 the tang is the Part of the sword inside the grip and mekugi bambo pegs are inserted through the grip. The brass clamp, the habaki, holds the Tsuba, handguard in place. The hole Ensemble can be dismantelt for cleaning and reassembeld again. The sword your archaelogists studys are museumpieces and state treasures and worshiped as part of Shintoism. For this reason these swords are Not diassembled.

12:43 tamashigiri, the Art of cutting is practiced for years to achieve these results. For practiced nowadays bamboomats are used and Not Bodys. 13:19 there is no problem to Cut the Bones of Chicken, sheep, boar or bull with a proper knife, If you know how.

The precursor swords to the katana was not called a taichi, that's of form exercise/martial arts from China. The sword used before the katana was called that tach and was wron edge down, as opposed to edge up with the katana, and hanging by cords from the belt instead of tucked in it. Another thing, while samurai did start out as mounted archers, they did not remain so. During later periods they often acting as infantry armed with pole arms.

Great vids on your channel keep up the good work

The inner metal is hard and the outside is soft

I always wanted to learn how to handle a kataná, since i was a little boy.

Yep, Saburai switched to guns at the first opportunity!

the remarks about the movement restrictions of the armor....... its a terrible misconceptions that samurai armor or european armor where too heavy for agile movement, especialy the samurai armor wich was tailor made to be as agile as possible while retaining some protection. there are videos out there showing gymnastics in full plate european armor and sword fights in full samurai armor. stop spreading the 1000 times debunked myth of armor is so heavy you can barly move while wearing it.