If it did not change since the mechanics of spawning enemies is the following. There are enemy camps that are active, creating groups that will go out and ravage the land. When there is enought “goods” ravaged they return and deliver em to their camp. When that reaches a certain resourse number they will spawn a big group that will go and create a new camp in that region. The more resource the camps have the stronger troops they produce. So with time going on and camps not being destroyed the amount and strenght of the spawned enemies will grow constantly. This was the mechanic from what I understood.
