The History of Kendo
Courtesy: All Japan Kendo Federation
When looking back into the History of Kendo, there are several fundamental points that cannot be overlooked.
The first point is the advent of the Japanese sword. The Japanese sword that emerged in the middle of the 11th Century (middle of the Heian Era, 794-1185) had a slightly arched blade with raised ridges (called Shinogi). Its original model was presumably handled by a tribe that specialized in cavalry battles in northern Japan during the 9th century. Since then, this sword was used by the Samurai and production technology advanced rapidly during the period of early Samurai-government reign (end of the Kamakura Era in the 13th Century). In this manner, it is not an exaggeration to say that both its wielding techniques using Shinogi, which produced the expression of Shinogi-wo-kezuru engaging in fierce competition and the Japanese sword, were Japanese born products.
After the Onin War occurred in the latter half of the Muromachi Era (1392-1573), Japan experienced anarchy for a hundred years. During this time, many schools of Kenjutsu were established. In 1543, firearms were brought to Tanegashima (Island located off the southern tip of Japan). The Japanese sword was made using the Tatarafuki casting method with high quality iron sand obtained from the riverbed. However, it did not take long before large quantities of firearms were made successfully using this high quality iron sand and the same casting method to produce swords. As a result, the heavy-armored battling style that prevailed up to then changed dramatically to a lighter hand-to-hand battling style. Actual battling experiences resulted in advanced development and specialization of sword-smithing as well as the establishment of more refined sword-handling techniques and skills that have been handed down to the present through the various schools such as the Shinkage-ryu and Itto-ryu.
Japan began to experience a relatively peaceful period from the beginning of the Edo Era (1603-1867). During this time, techniques of the Ken (the Japanese sword) were converted from techniques of killing people to one of developing the person through concepts such as the Katsunin-ken which included not only theories on strong swordsmanship, but also concepts of a disciplinary life-style of the Samurai. These ideas were compiled in books elaborating on the art of warfare in the early Edo Era. Examples of these include: “Heiho Kadensho (The Life-giving Sword)†by Yagyu Munenori; “Fudochi Shinmyoroku (The Unfettered Mind )†by Priest Takuan which was a written interpretation of Yagyu Munenori’s “Ken to Zen (Sword and Zen)†written for Tokugawa Iemitsu, Third Shogunate for the Tokugawa Government; and “Gorin-no-sho (The Book of Five Rings)†by MiyamotoMusashi.  Many other books on theories of swordsmanship were published during the middle and latter half of the Edo Era. Many of these writings have become classics and they influence many Kendo practitioners today.