In addition, the Joseon governing administration adopted a stringent isolationist plan, earning the nickname "the hermit kingdom", but ultimately failed to safeguard itself in opposition to imperialism and was compelled to open its borders, starting an period leading into Japanese imperial rule.
Though the Sui Military was lured into a entice with the famed Koguryŏ commander Ŭlchi Mundŏk, and suffered a calamitous defeat within the Salsu (Ch'ŏngch'ŏn) River. It is claimed that only 2,seven-hundred in the three hundred,000 Sui troopers who had crossed the Yalu survived to search out their way back again, and the Sui emperor now lifted the siege of Liao-tung Fortress and withdrew his forces to China right. Yang Ti continued to mail his armies in opposition 파라곤 to Koguryŏ but again devoid of good results, and before prolonged his war-weakened empire crumbled." ^