"Chang Dao, this (weapon) only became known (to the Chinese) since the incursion of Japanese into China."
— General Qi Ji Guang
Chang Dao was adopted by general Qi Ji Guang (戚繼光) during his campaign against the Wokou (倭寇). He also acquired a Japanese sword treatise of the Kage-ryū (陰流 or 影流) school through unknown means, and derived his own system called Xin You Dao Fa (辛酉刀法) based on Kage-ryū techniques. Xin You Dao Fa was thought to be lost forever (only some drawings survived) until its recent rediscovery in Korea, preserved intact in the Korean martial arts manual Muyejebo (《무예제보》 or 《武藝諸譜》) with its name changed into Ssangsudo (쌍수도 or 雙手刀, two-handed sabre).
Qi Ji Guang was not the only person to develop a swordsmanship system for Chang Dao. Other systems such as Dan Dao Fa Xuan (單刀法選) by Cheng Zong You (程宗猷) and early Qing Dynasty Dan Dao Fa Shi Ba Shi (單刀法十八勢) by Wu Shu (吳殳), had direct influence on later Miao Dao swordsmanship.
|Extant Ming Dynasty Dan Dao still in pristine condition.|