Li Shiji

Li Shiji, serving under Li Jing, commanded a Tang army that defeated the Eastern Tujue forces at the Battle of Yinshan. He pursued the fleeing Tujue khagan and captured him. This victory contributed to the collapse of the Eastern Tujue Khaganate and expanded Tang influence.

Li Shiji led a Tang army against the Xueyantuo (Syr Tardush) Khaganate, which had risen to power after the fall of the Eastern Tujue. He defeated the Xueyantuo forces at the Battle of Nuozhen River, forcing their khagan to flee. This campaign secured Tang dominance in the steppe.

Li Shiji served as a field commander in Emperor Taizong's campaign against Goguryeo. He led the Tang army in the siege of Liaodong (modern Liaoyang) and captured the city. However, the overall campaign failed to conquer Goguryeo due to logistical difficulties and stiff resistance.

After Emperor Taizong's death, Li Shiji was appointed Grand Chancellor (Shangshu Zu Pushe) by Emperor Gaozong. He served as a key advisor and administrator, helping to maintain stability during the transition of power. He held this position until his death in 669.

Li Shiji, now in his 70s, commanded the Tang army that finally conquered Goguryeo. He led a combined land and naval force, capturing the capital Pyongyang and the last Goguryeo king. This victory ended the Goguryeo kingdom and brought its territory under Tang control.