Late Goguryeo Period Person - Ko Yeonsu

 King Yeongryu was crowned in Goguryeo, but when ambitious Dangtaejong called in Jin Daedeok to look into Goguryeo's situation, Yeon Gaesomun took power in Goguryeo, killed King Yeongryu, and killed all opponents, and took power. Under this pretext, Tang Tae-jong led 100,000 soldiers to Goguryeo in the 4th year of King Bojeong (645). Lee Se-jeok invaded the army in a fluctuating manner with 60,000 troops, and Jangryang headed to Pyongyang with 40,000 naval forces divided into 500 battleships. Tang Dynasty troops captured Gaemoseong, Bisa Castle, etc. and marched to Yodongseong Fortress. Finally, King Taejong, who crossed the guard and advanced to Yodongseong Fortress, drained and used a guncha to attack day and night, and later set fire to the castle using the strong south wind, but was eventually taken down by 100,000 elite soldiers of Tang Taejong in 12 days. In this fight, more than 10,000 people were killed and 500,000 islands of grain were lost. Dangtaejong then fell to Baekamseong Fortress and advanced to Ansiseong Fortress. Yeon Gaesomun gave 150,000 people to Ko Yeon-su and Ko Hye-jin, who were abusive in the north, to defend Ansi-seong, but foolish Ko Yeon-su advanced to 8 ri from the southeast of Ansi-seong, but Tang Tae-jong's elite troops surrendered and attacked Ansi-seong without stopping. Tang Dynasty troops eventually attacked by building earthen fortifications higher than Ansi Fortress, but Goguryeo troops responded by building higher earthen fortifications inside the fortress. Then, when Tangna-gun threw countless rocks at the forefront of the gun truck and broke down the wall, Goguryeo-gun set up a wooden fence to block it, and Dangtaejong blindly mobilized all nearby residents and soldiers to build Saturn (the Saturn was bigger than the real mountain), but when Goguryeo secretly went back and attacked Tang Dynasty, Tangtaejong eventually returned. I'll go back when I lose again. Dangtaejong takes turns and wails, feeling keenly that even 1.13 million troops could not break Goguryeo.