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Silla(新羅) took the districts around the Han River which Baekje(百濟) had recovered in 552. On this account, Baekje attacked the Silla and this battle was a so-called Gwansanseong Battle(管山城 戰鬪, 554). Thus the attack of Baekje on Gwansanseong was to overcome the political blow on leading power of northward expansion and recover a failure in northward expansion according to the advance of Silla in the districts around the Han river. This battle, however, wasn’t short one which end in the Silla’s victory on July 554, as recorded in Samguksaki(三國史記). It was conducted in the 'international war' in which Baekje, Silla and Goguryeo(高句麗) intervened, from July to December 554, in order of failure in Gwansanseong(관산성), Jinseong(진성) and Ungcheonseong(웅천성), defeat and death of Seong, and defeat of Yeochang(여창). The attack of Seong and his son on Silla‘s Gwansan-Fortress which was launched at the risk of domestic opposition had an greater effect on domestic and foreign policies. First, Baekje which was defeated in the battle internally suffered severe crisis and internationally couldn't help neglecting Silla’s annexation of Gaya. In comparison, Silla became powerful and prosperous country on the basis of districts around the Han river and positioned as a new power in the Korean Peninsula. Goguryeo was free from pressure of southbound and gained time to cope with a northern people and north China. In this context, Gwansanseong Battle was the struggle for supremacy in the Korean Peninsula between Baekje and Silla. But it was the important battle to establish order in Northeast Asia.