Kim Busik, in his Samguk Sagi (Chronicles of the Three Kingdoms), lamented that the name of the steadfast commander of Ansi Fortress was unknown:[2] Emperor Taizong of Tang was a prominent and intelligent ruler not commonly seen.
This is lamentable.However, an author by the name of Xiong Damu from the Ming dynasty used the name Liang Wanchun (梁萬春) to refer to the defender in his Historical Fiction novel Tangshu Zhizhuan Tongsu Yanyi.
[3] During the Japanese invasions of Korea, the Ming generals Wu Zongdao and Li Shifa said to Yun Geunsu that the defender's name is Liang Wanchun.
[5] The Collected works of Master Dongchundang (동춘당선생별집, 同春堂先生別集) by (송준길, 宋浚吉), first compiled in 1768, includes the passage: "Someone asked, 'What was the name of the commander of Ansi fortress?'
This was not the signal for an immediate attack, but to demonstrate the Emperor's generosity in granting Yang Manchun one hundred p'il roll of silk, praising him for defending the Fortress successfully for his own Korean king.
However, although Yeon had quickly gained control over the rest of the country, Yang Manchun refused to surrender Ansi fortress.
Taizong eventually ordered the construction of a large earthen siege ramp, which Yang instead captured and used as part of his defense.