 Baekje had no choice but to move its capital to mountainous Ungjin (present-day Gongju), 80 miles to the south, which provided a natural protection for the devastated kingdom.In 479, Baekje and Silla reaffirmed their alliance through marriage, which was the primary reason why Goguryeo was unable to conquer the entire peninsula.In 551, a Baekje–Silla alliance attacked Goguryeo in order to capture the important Han River region from Goguryeo, planning to split it between them.