In the autumn of that year the two generals, Yang-bok and Sun-ch’i, invaded Korea at the head of a strong force; but U-gŭ was ready for them and in the first engagement scattered the invading army, the remnants of which took refuge among the mountains. It was ten days before they rallied enough to make even a good retreat. U-gŭ was frightened by his own good luck for he knew that this would still further anger the Emperor; so when an envoy came from China the king humbled himself, confessed his sins and sent his son to China as hostage together with a gift of 5,000 horses. Ten thousand troops accompanied him. As these troops were armed, the Chinese envoy feared there might be trouble after the Yalu had been crossed. He therefore asked the Prince to have them disarmed. The latter thought he detected treachery and so fled at night and did not stop until he reached his father’s palace in P‘yŭng-yang. The envoy paid for this piece of _gaucherie_ with his head. Meanwhile Generals Yang-bok and Sun-ch’i had been scouring Liao-tung and had collected a larger army than before. With this they crossed the Ya-lu and marched on P‘yŭng-yang. They met with no resistance, for U-gŭ had collected all his forces at the capital, hoping perhaps that the severity of the weather would tire out any force that might be sent against him. The siege continued two months during which time the two generals quarreled incessantly. When the Emperor sent Gen. Kong Son-su to see what was the matter, Gen. Sun-ch’i accused his colleague of treason and had him sent back to China, where he lost his head. The siege, continued by Gen. Sun-ch’i, dragged on till the following summer and it would have continued longer had not a traitor within the town assassinated the king and fled to the Chinese camp. Still the people refused to make terms until another traitor opened the gates to the enemy. Gen. Sun-ch’i’s first act was to compel Prince Chang, the heir apparent, to do obeisance. But the people had their revenge upon the traitor who opened the gate for they fell upon him and tore him to pieces before he could make good his escape to the Chinese camp. Such was the miserable end of Wi-man’s treachery. He had cheated Ki-jun out of his kingdom which had lasted almost a thousand years, while the one founded by himself lasted only eighty-eight. It fell in the thirty-fourth year of the Han Emperor Wu-ti, in the year 106 B.C.