An organized approach to Korean sword was documented in the "Army Account of Military Arts and Science" (), a Ming dynasty strategy book written in 1629 by Mao Yuanyi. In his work, Mao identifies Korean fencing () as a series of sword methods originating from the area of Korea. Mao reports that these methods had been brought to China during a time when Chinese sword work had declined and were ascribed to about the 9th century by Mao, or about the time nearing the end of the Unified Silla Period.