The Silla–Tang War (670–676) occurred between the Silla kingdom of Korea (joined by Goguryeo and Baekje loyalists) and the Tang dynasty of China.

[2] It began in the geopolitical context immediately following the conquest of Goguryeo and Baekje by the joint forces of Silla and Tang.

The conflict ended with a truce between Tang and Silla due to the internal political situation in both states,[5] with the dividing territorial line at the Taedong River basin.

Originally Emperor Taizong of Tang promised to exchange Baekje and the lands south of Pyongyang in return for Silla's military cooperation.

[18] The Tang were forced to relocate the seat of the Protectorate General to Pacify the East to the more easily defensible city of Liaoyang.