[mistrial9]

imagine a way of the sword and a way of the cloth. The cloth ways prosper while the sword ways train to fight. The sword way group then kills or threatens to kill the cloth way group, demanding payment. So it begins.

Later, roving hordes on horseback arrive without warning from far away, and simply take everything, breaking any balance. The horse masters are the new rulers. Later, the horse masters lose. etc

[SiempreViernes]

You leave out the bit where the sword way freeze to death because they have no technology to deal with the harsh weather (which obviously is present because there's a need for cloth in the first place).