The decline of the Tibetan Empire and the attacks of the Tang Dynasty loomed large on the northwest border of the Tang Dynasty. The famous general Guo Yuanzhen of the Tang Dynasty said, "The Tibetan Empire is about to fall into civil strife, and the great battle between Xue Rengui, the Tibetan prime minister, and the Tang army will hardly reverse the decline!" This prophecy foreshadowed the imminent great transformation facing the Tibetan Empire. The signs of the Tibetan Empire's decline had already emerged at the end of the 7th century and the beginning of the 8th century. Internal power struggles were fierce, and the political situation was chaotic. Meanwhile, external pressures on the Tibetan Empire were also increasing. The constant conflicts between the Tang Dynasty and the Tibetan Empire, especially after the Tang Dynasty implemented the policy of the Four Garrisons in Anxi, had dealt severe blows to the Tibetan Empire's offensives against the Tang Dynasty. Against this backdrop, the battle between Xue Rengui's Tibetan prime minister army and the Tang army became one of the important offensives launched by the Tang Dynasty against the Tibetan Empire. After defeating Xue Rengui's army, the Tang Dynasty further penetrated into the Tibetan territory, capturing some important towns and regions, and further weakening the strength of the Tibetan Empire. The Tang Dynasty's attacks on the Tibetan Empire were not accomplished overnight. In the multiple battles between the Tang Dynasty and the Tibetan Empire, the prophecy put forward by the famous general Guo Yuanzhen of the Tang Dynasty was verified. The Tibetan Empire was riddled with internal contradictions and faced increasing external pressures, making it difficult to reverse its decline. The Tang Dynasty's attacks on the Tibetan Empire were more about seizing opportunities to strike at the Tibetan Empire rather than directly eliminating it. Against this backdrop, the Tibetan Empire gradually declined. After the Tang Dynasty implemented the policy of the Four Garrisons in Anxi, the Tibetan Empire suffered severe blows in its offensives against the Tang Dynasty, with fierce internal power struggles and a chaotic political situation. Meanwhile, external pressures were also increasing. The battle between Xue Rengui's Tibetan prime minister army and the Tang army became one of the important offensives launched by the Tang Dynasty against the Tibetan Empire. After defeating Xue Rengui's army, the Tang Dynasty further penetrated into the Tibetan territory, capturing some important towns and regions, and further weakening the strength of the Tibetan Empire. For the Tang Dynasty, attacking the Tibetan Empire was one of its important means of territorial expansion. Through multiple attacks on the Tibetan Empire, the Tang Dynasty occupied some important towns and regions of the Tibetan Empire, further expanding its territorial scope. At the same time, the Tang Dynasty's attacks on the Tibetan Empire also had a positive impact on its border security, effectively containing the threat posed by the Tibetan Empire to the Tang Dynasty. However, for the Tibetan Empire, its decline was inevitable. Issues such as fierce internal power struggles, chaotic political situations, and increasing external pressures could no longer be effectively resolved. The defeat of Xue Rengui's Tibetan prime minister army became one of the important turning points in the Tibetan Empire's decline from prosperity to decline. In the end, through multiple attacks on the Tibetan Empire, the Tang Dynasty occupied some of its important towns and regions, effectively containing the threat posed by the Tibetan Empire to the Tang Dynasty and safeguarding its border security. The Tibetan Empire gradually declined, losing its dominant position on the northwest border. The Tang Dynasty's attacks on the Tibetan Empire became an important means of territorial expansion and border security, and also an important event in the northwest border region of Chinese history.

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