The so-called Northern Territory refers to the northwestern border area of the Da Lan Dynasty.
From Juping Mountain to Black Soil River, the Da Lan Dynasty has set up a defense line over six hundred li long on the northwestern border, consisting of five major cities and twenty-one military towns.
This line of defense has been resisting the invasions of the Northern Barbarians for hundreds of years, preventing them from launching major offensives into the Central Plains.
The people living in the five cities and twenty-one military towns are mostly border army soldiers and their families, along with logistics personnel, and beyond that, only passing merchants.
Ordinary people would not be willing to live in such a place where wars could break out at any time.
On this Northern Border Defense Line, there are a hundred-thousand-strong army and a ten-thousand-strong Imperial Camp Army, with a resident population of over five hundred thousand.
