C789 night assault on Han camp
Luoyang City ruled the Central Plains. North was Mang Shan, south was Luo Shui, east was Luo Huai, and west was Guan Long. There were also mountains encircled by the east was the tiger prison, and there was control over the west was the Hangu Pass. North was You Yan, South was Yi Que.
It was also said that the Luoyang was the place where the Dragon Bloodline of China gathered. Therefore