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Goguryo had a serious antagonism against Baekje because of sovereignty claims to heights of Guns and Hyuns in late 4th century. Its advance to the south began by King Gwanggaeto via King Sosurim and King Gogukyang. As it was not easy for Goguryo to break through Baekje’s defenses, it expanded the influence on Malgal Groups(靺鞨勢力) living in the Bukhan River Basin from Singye, Hwanghaedo, over Masikryung Mountains, through Eechon, Pyonggang, Chunchon and Cholwon. Goguryo under the reign of King Gwanggaeto occupied the Namhan River Basin, Malgal and even part of the Silla reaching to Gyeongju. It took Hansung of Baekje under the reign of King Jangsoo, but returned it to Baekje and built a fortress in Mountain Acha in the north of Han River to prepare against Baekje’s going north. Goguryo barely maintained the dominium over Namhan River Basin due to attacks by Baekje and Silla. It defeated the attacks and maintained its dominium over Malgal, but yielded the southern area of Han River to Baekje. Goguryo dominated the upper region of Han River, but it lost its lower region by King Munyong’s attacks. However, it successfully expelled Baekje south of Ansung River under the reign of King Anjang. Its occupancy over the Han River Basin did not last and in mid-6th century it was attacked by allied forces of Baekje and Shilla. Goguryo had a serious succession war before and after King Yangwon’s accession to the throne in the 6th century and was invaded by Dolgwol. By taking advantage of weakened power of Goguryo, Baekje banded together with Silla and successfully regained Han River Basin. Shilla occupied the lower region of Han River Baekje had occupied, which was a cornerstone for unification of the three nations. The long and violent war over Han River Basin between Goguryo and Baekje entered a new stage because of Silla’s appearance.