It is widely believed that the beginning of the full-scale border between Baekje and Silla began in 553. The border between Baekje and Silla changed through the establishment of Silla’s Shinju in July 553 and the Battle of Gwansan Fortress in July 554. It bordered on the border from Asan Bay to Gukwon Fortress(Chungju), Samnyeonsangun(Boeun) and Gammunju(Gaeryeong). In the late 6th century, after Silla’s unilateral dominance, the two countries were in a very insufficient situation. However, despite the poor conflict, Baekje showed an aggressive appearance. These include the BaekjeJapanese-Daegaya alliance’s attack on Silla(562) and Baekje’s invasion of Ilseon(Gumi Seonsan, 577). The main battle areas in the early 7th century were Amak Fortress, Gajam Fortress, Neoknohyeon, Sokham Fortress, Seogok Fortress, and Doksan Fortress. This means that Baekje attacked Silla’s Sangju-Haju region and the Shinju region. Although Baekje waged a large-scale all-out war in the first half of King Mu’s reign, it did not achieve results. However, from the latter half of King Mu’s reign, he overwhelmed Silla from Unbong in Jeollabuk-do to Hamyang in Gyeongnam to the western part of Gyeongnam. The middle of the last 7th century shows a fierce pattern. The situation first unfolded in the form of Baekje occupying Silla’s 40 fortresses and Daeya Fortress(642). The 40 fortresses are estimated to be in the Gyeongsang-do area from Sokham(Hamyang) to Apryangju(Gyeongsan). Accordingly, the subsequent battles of Maeripo(Changnyeong), Musan Fortress(Muju), Gamul (Gimcheon), Dongjam(Gumi), Yogeo(Sangju), Daeya Fortress(Hapcheon), Jinrye(Gimhae), Seokto Fortress(Jincheon), and Dosal Fortress(Goesan) refers to an offensive and defensive battle between the Sobaek Mountains and the Nakdong River.