After Silla took over the Han River basin, the war between Baekje and Goguryeo entered a lull. Historical records such as Samguksagi(三國史記)record four wars between the two countries. This article began with questions about how Baekje and Goguryeo would have fought in the presence of Silla between Baekje and Goguryeo. Since the mid-to-late 6th century, the military conflict between Baekje and Goguryeo is importan tthat it is a prerequisite for understanding the friendship between the two countries in the 7th century. This article considered the case in which Goguryeo attacked Songsanseong and Seokduseong in Baekje and captured 3,000 Baekje’s people in 607, the last of the four collisions. Goguryeo also invaded the northern border in Silla, capturing 8,000 people. During this period, Goguryeo continued to have tension after a large-scale war with the Sui Dynasty in 598. The war atmosphere between the two countries heightened as Goguryeo envoys and Suyangje met in the tent of the stone palace gyemin. Goguryeo is believed to have mobilized the people of Baekjeand Silla to use them in military fields such as soldiers and fortresses. Meanwhile, after taking over the Han River basin, Silla exerted influence in the Han River basin by establishing a state and sending envoys to China. However, it is believed that the control of the lower reaches of the Han River and the west coast along the border with Goguryeo was not announced. Songsanseong and Seokduseong in Baekje are currently desig-nated as Dangjin area, the northern end of Chungcheongnamdo. The are ais in contact with Gyeonggi-do with As anman Bay in between. Goguryeo is believed to have been able to attack Baekje by utilizing the conditions in which Silla’s influence did not reach the west coast and the natural conditions of the west coast.