While the Růmzqūze had known about the Chäng since before -200, real interest in the northern grasslands began with the publication by the scholar Kokiuv of "'On the Verdant North", a collection of his notes while travelling there. Soon after, enthusiasm for colonizing the north began spreading all across Exhpazixh, and within 10 years, boom towns sprang up all across the north (the biggest one, Venggoi, reaching 7000 people).
However, life on the frontier was not easy. The homeland was far away, and communication was difficult. Supplies had to be produced locally, and towns were subject to conflict with Chäng tribes and bandits. Due to these circumstances, the frontier towns in these times, while nominally Ialtuxhe in their origins, often acted as independant city states with their own laws and their own armies, which on a few occasions went to war with each other.
Finally, in -153, it was decided at the Council of Båzda that, in order to ensure the safety of their fellow Růmzqūze and to safeguard Růmzqūze civilization, the Expedition of the Security of the Ordered Peoples (also known as the Northern Expedition) was formed with three tasks. Firstly, to drive all Chäng tribes that did not agree to join a Růmzqūze city and assimilate north of the Zqheong river (where there were only 4 small Růmzqūze towns). The second was to act as a constabulary force, enforcing the unified law across all town and cities. The third was to construct a series of walls and fortifications along the new Chäng frontier to protect the emerging colonial grassland from Chäng invasion. The Expedition Wars were a complete success, and all Chäng were removed to the far north, where many died of overcrowding.