Goryeo was invaded through the Mongols in 7 big strategies within the 1230s till the 1270s, but was in no way conquered.[117] Exhausted immediately after many years of battling, Goryeo despatched its crown prince to the Yuan capital to swear allegiance towards the Mongols; Kublai Khan acknowledged, and married among his daughters on the Korean crown prince,[117] plus the dynastic line of Goryeo ongoing to outlive underneath the overlordship of your Mongol Yuan dynasty as a semi-autonomous vassal state and compulsory ally.

Although the Sui army was lured right into a lure from the famed Koguryŏ commander Ŭlchi Mundŏk, and experienced a calamitous defeat with the Salsu (Ch'ŏngch'ŏn) River. It is said that only two,seven hundred of the three hundred,000 Sui soldiers who experienced crossed the Yalu survived to discover their way back, plus the Sui emperor now lifted the siege of Liao-tung Fortress and withdrew his forces to China appropriate. Yang Ti ongoing to ship his armies against Koguryŏ but 토토 yet again without having results, and just before very long his war-weakened empire crumbled." ^