Was in conversation with a friend today who's studying Northern Shaolin Long Fist wushu in China (more like Inner Mongolia...), and interesting nugget came up. It appears there's a huge and significant connection between Chinese DaoFa and Kenjutsu. This was rather stumbled upon accidentally by the Japanese scholars who were trying to reconstruct the original Kage-ryu, an extinct style that was very influential back in the day and probably the first recognizable Japanese style. This is all but lost to us today, except for its derivative of Shinkage-ryu.
Enter China. It appears that the Ming military elite was quite taken with kenjutsu and katana during the period of Wa-ko raids all along the southern Chinese coast. They were eventually routed by General Qi, who went to produce one of the most famous military manuals in the Chinese history, Ji Xiao Shin Shu. General Qi inflicted devastating defeat on the Japanese pirates in 1561, capturing nearly 2000 prisoners and destroying their fleet.
Chinese historical records show that during the late 16th century captured Japanese coastal raiders (a.k.a. pirates) had been pressed into service training Chinese troops. General Qi was quite taken with the aggressive sword work of the Japanese members of the Wa-Ko incursions both from a tactical and training point of view. Japanese records suggest that the proponderance of Japanese actually involved in these incursions came from the southern most island in the Japanese islands and I understand there are at least two very aggressive styles that come out of this area. This is often used as the rationale for both his designing a long sword form using a weapon some 6' long, as well as his use of the squad formation he adopted for his troops.
More importantly, important historical references exist in China regards to Kage-ryu! Eureka! A big breakthrough. It appears that General Qi had somehow acquired the Kage-ryu mokuroku (teaching manual) in the process of smashing Japanese pirates and his own military manual shows clear Kage-ryu influence. Thus Qi's manual has been extensively studied by the Japanese scholars trying to reconstruct the original Kage-ryu, the precursor to today's Shinkage-ryu.
This isn't the only prominent Chinese manual featuring kenjutsu or Kage-ryu. There is an illustrated Chinese manual of kenjutsu titled Dan DaoFa Xuan (early 1600s) by Cheng ZongXian, a famous wushu theorist and Ming loyalist. It shows two series of katas, one with 22 steps and another one with 12 steps. The illustrations show people in Chinese fashion, but with what are clearly katana worn uchigatana style with the scabbard thrust through the waist sash, cutting edge upwards. According the text, the katana have an overall length of 5 feet, with blades 3.8' long and handles 1.2' long. Each form is given a Chinese name, but many of the postures clearly resemble standard Japanese forms.
WuBei Zhi, a famous miltiary manual from the Ming military writer Mao YuanYi, also has partial reproductions of Kage-ryu techniques, among other things. WuBei Zhi was an omnibus covering every possible aspect of Chinese warfare and military training.
Culturally, famous Ming scholars like Tang Shunzhi wrote poems about their favorite katana. These men were not fighters, but collectors who appreciated fine craftsmanship. Similarly, the technological skill of Japanese sword smiths was praised by non-literary Ming authors such as Song Yingxing, author of the TianGong kaiWu (an important compendium of engineering knowledge of 17th century China), who wrote that Chinese smiths lacked the ability to duplicate Japanese forging techniques.
The two Chinese styles that were affected by the experience of battling the Japanese pirates were in DaDaoFa and MiaoDaoFa. DaDao is basically a large version of Dao that relies on fast and powerful cuts to overwhelm opponents. MiaoDao is more interesting, in that the sword clearly shows Japanese origin, as it's shaped like no-dachi -- an oversized katana.
I thought this was interesting, so I'm sharing it with you.