Reasons

Everyone was quite clear about it.

This was one of the reasons why there were not many brutal wars with Fan Yi Kingdom over the past decades. And even if there was not much war with the other kingdoms, the war at the north still wore Fan Yi Kingdom down.

Without capable generals protecting the border all year long, it would have been impossible for Fan Yi Kingdom to stand tall.

And once Fan Yi Kingdom fell to the northern tribes, the other kingdoms would have to step forward to take this problem upon themselves and pushed them away from their lands. It was a tacit agreement that the other kingdoms had. 

After all, who would want to give up their lands to these people?

None of them wanted it.

Wei Da Lang proceeded to talk about a few more things with Long Qian Xing before sending him away. He himself still had a few more things to settle.

One of them was to talk with his son, Wei Mu Bai.