which no events of importance transpired. In 331 Eul-bul the king of Ko-gu-ryŭ died and his son Soé began his reign by adopting an active policy of defense. He heightened the walls of P’yŭng-yang and built a strong fortress in the north, called Sin-sŭng. He followed this up by strengthening his friendly relations with the court of China. These facts did not escape the notice of the rising Yŭn power. Mo Yong-whang, who had succeeded Mo Yong-we, hurled an expedition against the new Sin-sŭng Fortress and wrested it from Ko-gu-ryŭ. The king was compelled, much against his will, to go to Liao-tung and swear fealty to the Yŭn power. Two years later the capital was moved northward to Wan-do, in the vicinity of the Eui-ju of today. This was done probably at the command of Yŭn who desired to have the capital of Ko-gu-ryŭ within easy reach in case any complications might arise. Mo Yong-whang desired to invade China without delay but one of his relatives, Mo Yong-han, advised him to disarm Ko-gu-ryŭ and the U-mun tribe so that no possible enemy should be left in his rear when he marched into China. It was decided to attack Ko-gu-ryŭ from the north and west, but the latter route was to be the main one, for Ko-gu-ryŭ would be expecting the attack from the north. The strategem worked like a charm. Mo Yong-han and Mo Yong-p’ă led a powerful army by way of the sea road while General Wang-u led a decoy force by the northern route. The flower of the Ko-gu-ryŭ army, 50,000 strong, marched northward under the king’s brother Mu to meet an imaginary foe while the king with a few undisciplined troops held the other approach. As may be supposed, the capital fell speedily into the enemy’s hands but the king escaped. The Ko-gu-ryŭ forces had been successful in the north and might return any day, so the Yun forces were forbidden to go in pursuit of the king. To insure the good behavior of the king, however, they burned the palace, looted the treasure, exhumed the body of the king’s father and took it, together with the queen and her mother, back to the capital of Yŭn. With such hostages as these Yŭn was safe from that quarter. The next year the king offered his humble apologies and made a complete surrender, in view of which his father’s body and his queen were returned to him but his mother-in-law was still held. The same year Ko-gu-ryŭ moved her capital back to P’yŭng-yang. A few years later by sending his son as substitute he got his mother-in-law out of pawn.