Relying on the Chaos of the World

Those original inhabitants of the area fled to the Great Steppe, while some join the Songnu, Xinbei, Kiang, Tie, Volgda and Sirong tribes 

All of these tribes is known as barbarians to the people of Yan and Western Zhou. 

Some of them have relation to the Great Steppe tribes and some come from a faraway further land

So, to the people of the Great Steppe, the people of Western Zhou took their lands, and force them out from their homes and then slaughter them and they have the audacity to claim that all the world belong to them

It is from that moment on, the battle between the Great Steppe and the Western Zhou began and have never stopped since. 

Right now, because of their internal problem, the Western Zhou minister did not sense the chance that is presented toward them and they did not see the threat that is coming from the Steppe. 

The Western Zhou is in its weakest moment and someone will take advantage of it.