The Northern Border referred to the borderlands in the northwest of the Great Blue Dynasty.
From Giant Screen Mountain to Black Earth River, the Great Blue Dynasty had established a defense line over six hundred li long along its northwestern border. It consisted of five great cities and twenty-one Military Towns.
This defense line had held back invasions by the Northern Barbarians for centuries, preventing them from launching a large-scale assault on the Central Plains.
The people living in the five great cities and twenty-one Military Towns were basically border soldiers, their families, and logistics personnel. Apart from them, there were only merchants passing through.
Ordinary civilians were unwilling to live in a place where war could break out at any moment.
Along this Northern Border defense line were a hundred thousand troops, an Imperial Guard Army ten thousand strong, and more than five hundred thousand permanent residents.
These cities, towns, and people together formed the Northern Border of the Great Blue Dynasty.
There was no direct train from Lanling City to the Northern Border.
The three of them changed trains twice before traveling from the nearest province to Slaying Barbarians City, one of the five cities on the Northern Border.
It was the great city closest to the front line, as well as the largest, most populous, and most heavily defended city.
Prince Cheng Qin Shixian's residence was in Slaying Barbarians City.
Li Fei, Miao Yangxia, and Su Jia arrived at Slaying Barbarians City by car. As they entered the city, they witnessed its imposing grandeur:
The city walls rose a hundred meters high. A row of City Defense Cannons was mounted on top, along with Heavy Machine Guns!
The Seventeen Northern Barbarian Tribes were still in the Cold Weapon Age. In both technological level and martial strength, they