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The policy of foreign conquest during the late Koryo started in earnest at the beginning period of King Gongmin. The keynote of policy which had planned and tried the foreign conquest, had great effect on the late Koryo & the early foundation of Chosun Dynasty. The policies of King Gongmin who pursued his own country's area & expanding foreign influence through foreign conquest, went on after the foundation of Chosun Dynasty as well as the era when Yi Seong-gye & the rising group of nobility were dominating the state affairs. The King Woo of Koryo began to develop the intelligence activities for the Territory of Yyodong from the early time of coming to throne, furthermore, he continued the intercourse with the local warlords at the same time. Koryo conflicted with Ming Dynasty with the issue of influence in the territory of Yyodong. In the meantime, as Ming Dynasty notified the issue of establishing Cheol Ryeong Wui to Koryo, the hierarchy including King Woo & Choe Yeong decided to conquer Territory of Yyodong. Finally, the conquest of Yyodong Territory by Koryo ended in failure due to Wihwado Retreat which was led by Yi Seongge and others. The foundation powers of Chosun Dynasty emphasized submission to the stronger as one of the causes for the retreat, which was more aiming at seizing the power. Chosun Dynasty also conflicted with Ming Dynasty immediately after the time of foundation. The most important problem out of the two countries' conflict was the initiative in Territory Yyodong & Manchurian Area. The case in which the two countries' conflict had been maximized, turned out to be the Conquest of Territory Yyodong led by the first king of Chosun Dynasty, Jeong Do-jeon and others. This indicates that Chosun Dynasty tried to establish the national system and magnify the external power of influence as it planned and enforced the foreign conquest.