 The last king of Balhae surrendered to the Khitan Army and the capital was overrun.The king was captured, but the Crown Prince managed to gather an army and escape to Goryeo in hopes of gathering strength to avenge the humiliating defeat and downfall of his nation.Dae Gwang-hyeon arrived with his fellow Balhae people during the 1st month of 937, the 17th year of King Taejo's reign.