Momentum

These are the advantages of time and the era that the Great Steppe is living in.

As long as one tribe could break the chains around them and embark in an ambitious endeavour led by an ambitious leader, they could quickly raise an army and swell in size.

There is all kinds of factor that allowed a small tribe to swell like this.

The most biggest factor is the weakening of the Yan dynasty presence in the border.

Then there is a lack of unifying figure which is fulfilled by Aeryon

Giving himself the character of a unifying figure also wins him a lot of warriors and people who have ambition in their heart to chase fame and fortune, among other things

And momentum.

Mayeux remembers the history of the past and knows out of the three factors the most important factor is momentum