The Battle of Baekgang occurred as the fallen kingdom of Baekje, which had been conquered by Silla and Tang in the earlier decades, attempted to regain its former power with the assistance of Yamato Japan. Baekje sought to leverage Japanese military support to stage a restoration, posing a challenge to the influence of Silla and Tang in the peninsula. As the Baekje troops gathered near the Baekgang River, they faced a coalition of Silla and Tang armies determined to prevent the resurgence of their rival.

The Silla forces, under the leadership of military leaders and coordinated with Tang forces, moved quickly to confront this newly organized Baekje army. After a series of tactical engagements, the Silla-Tang coalition systematically overwhelmed the Baekje forces. The battle is very significant not just for its military outcome but for the broader implications it had on the influence of Japan in Korea and the stability of Silla as the leading power in the region.

Ultimately, the defeat of Baekje and the withdrawal of Japanese forces marked a pivotal shift, altering the balance of power in East Asia. This victory showcased the effectiveness of the Silla-Tang alliance and signaled the decline of Japanese intervention in Korean affairs, shaping the future political landscape for centuries to come.