While Silla is a vassal state of Great Sheng, it has always served as a natural barrier to ward off the robust cavalry of the nomadic Rouran tribe.
The Rouran are nomadic people with formidable cavalry, unrivaled in the world, constantly menacing the border, pillaging the populace.
For many years, they have been a major thorn in the side of Great Sheng.
According to reliable intelligence, while Great Sheng relies on Silla to thwart Rouran, Silla, although outwardly compliant to Great Sheng, is secretly colluding with Rouran.
Indeed, if they wholeheartedly supported Great Sheng and confronted Rouran, the day Rouran is defeated would also mark the doom of their servitude.
Now that the Prince of Zhao's great army occupies Silla and leveraging Silla's natural terrain, he can truly match up against Rouran.
