How Did He Become an Intelligence Chief When He Was a Frontier Soldier?

Duan Muchen, a blacksmith from Chang'an City, was furious when he saw the Tang court and the Turks signing the Weishui River Alliance. Resolutely joined the frontier army. Soon after, the situation deviated from the planned trajectory. Duan Muchen: Where are the promised border troops? How did I become the intelligence chief! Li Shimin: The intelligence chief also contributed to the Tang Dynasty, so why bother. In this way, Duan Muchen, who originally joined the frontier army with the ideal of beating up the Turks, became the first head of the intelligence organization of the Tang Empire.