The yellow sand is all over the sky, the remnant sun is like blood, a majestic pass stands proudly on this desolate land, this pass is the fortress of the Central Plains leading to the Western Regions - Yumen Pass.

Yumen Pass is the world of the Western Han Dynasty, there are 36 countries in the Western Regions outside the pass, and there is a force that cannot be underestimated: the Xiongnu.

As early as the reign of Emperor Wen of the Han Dynasty, the Xiongnu defeated the Dayue clan and controlled some small countries in the Western Regions, and their power became stronger and stronger, and many small countries succumbed to its obscenity and were bullied.

The Xiongnu coveted the rich products and fertile land in the Yumen Pass for a long time, but as early as the Han Gaozu period, the Xiongnu had always entered into a "peace policy" with the Han Dynasty. Although he had the intention to enter the main pass, but seeing that the Western Han Dynasty was getting stronger and stronger, for the sake of safety, he could only temporarily recuperate, but from time to time, the Xiongnu would send people to harass the border of the Han Dynasty on a small scale, making the border people miserable.

After Emperor Wu of the Han Dynasty ascended the throne, although he still implemented the "peace policy" on the surface, he had long heard of the Xiongnu's actions, and he knew more about the Xiongnu's wolf ambitions, so for many years, Emperor Wu had frequently sent envoys to make friends with the countries of the Western Regions, and by the way, he heard the news and tried to contain the Xiongnu.

This move made the countries of the Western Regions sandwiched between the Western Han Dynasty and the Xiongnu bitter, and they were small and weak, and they were in a very embarrassing position. They can't afford to provoke the two great powers, and neither of these two powers wants to control the thirty-six small countries in the Western Regions first, in order to develop further.

Among the countries of the Western Regions, the geographical location of Loulan is particularly sensitive, with the southwest leading to the end, Jingjue, Kumi, and Khotan, the north to the Cheshi, the northwest to Yanqi, the east to Bailongdui, and Dunhuang, choking the key points of the Silk Road.

At the beginning of Emperor Wu of the Han Dynasty, he passed through the Western Regions, and the envoys had to pass through Loulan. Loulan was forced by the prestige of the two great powers, so he had to compromise and seek perfection, on the one hand, he repeatedly acted as the eyes and ears of the Xiongnu and attacked the envoys of the Western Han Dynasty. On the other hand, he sent envoys to the Western Han Dynasty to claim vassal to Emperor Wu.

Emperor Wu had long been dissatisfied with King Loulan's two-faced and three-sworded approach, but due to the situation, he had to endure it.

A few years have passed in the blink of an eye, and although the envoys sent by the Western Han Dynasty to the Western Regions are numerous, there are very few who can return to the Guannai alive......