THE SINGLE BEST STRATEGY TO USE FOR KOREA

Goryeo was invaded by the Mongols in seven main strategies with the 1230s right until the 1270s, but was by no means conquered.[117] Exhausted right after a long time of preventing, Goryeo despatched its crown prince into the Yuan capital to swear allegiance to the Mongols; Kublai Khan accepted, and married among his daughters for the Korean crown