The good will of the Japanese government was shown when a prefect in western Japan sent sixty soldiers under the command of a monk, Sin Hong, to aid in the putting down of the corsairs. They made some attempts to check their lawless countrymen but soon found that they had undertaken more than they had bargained for, and so returned to Japan. As the pirates were ravaging the west coast as far north as P‘yŭng-yang, the king sent against them Generals Na Se and Sim Tŭk-pu who had been successful before. By the use of fire-arrows they succeeded in burning several of the enemy’s boats at Chin-p‘o and of course had the fellows at their mercy, for they had no means of escape. It is evident the king did not know his own mind in relation to Chinese suzerainty. Now he favored the Mongols and now the Mings. A year or so before this he had adopted the Mongol name of the year but now he turns about and adopts the Ming name again. It was this vacillation, this playing fast and loose with his obligations, that alienated the good-will of the Ming emperor and made him look with complacency upon the dissolution of the Koryŭ dynasty. Late in the autumn of 1379 the Japanese were again in dangerous proximity to the capital and the king wanted to move to a safer place. The geomancers’ book of prophecies indicated Puk-so San as “A narrow place and good for a king to live in,” but the courtiers opposed it, saying that there was no large river flowing near by, on which the government rice could be brought by boat to the capital. So it was given up. There was a Mongol general named Ko-ga-no who had become independent of the main body of the Mongols and had set up a separate government on his own responsibility in Liao-tung. He was wavering between natural ties on the one hand, which bound him to the Mongols, and the dictates of common sense on the other, which indicated the rising fortunes of the Ming. He chose a middle course by coming with his 40,000 men and asking the privilege of joining Koryŭ. The records do not say whether permission was given or not, but we may easily believe it was. In 1380 the Japanese government sent 180 soldiers under the command of Gen. Pak Kŭ-sa to aid in driving the pirates out of Koryŭ. In the midst of these dangers from freebooters, jealousy was undermining the government at Song-do. Gen. Yi T‘ă-jo had a friend named Gen. Yang Păk-yŭn who now under false charges, enviously made by officials near the king, was banished and then killed. It was wonderful that the fame of Gen. Yi did not bring about his murder.