The rapid development of the trap ruler attracted the panic of the northern Yi people. In the spring of Tianfeng in 113, the northern tribes, such as the Riva people, launched an attack on the trap ruler. At this time, the trap ruler had entered the grassland for two years
In the Northern Yi War, the conspirators secretly colluded with the Riva people, and the Riva people fought back against their allies from behind. The two sides jointly defeated the Yi people and the Riva people together to secure the position of the first military regiment of the nomadic people in the northern grassland. Soon…