This kind of large-scale decisive battle is something the Green Skin Orcs can't afford.
After suffering losses a few times, they had grown smarter.
Rarely do they assemble large forces. When they encounter a large number of human troops gathering for an advance, they scatter, even at the expense of losing hard-won ecological circles and key sites such as garbage city armories.
And the dispersed Green Skin Orcs, relying on not needing food supplies, in addition to some garbage-built armed trucks, with Skugg Beasts for transport, and carrying extra ammo supplies, formed numerous armies ranging from a few hundred to just over ten thousand in size, poking into the depths of the human army's frontline.
Often in the front, a considerable number of petty spirits formed fodder armies, drawing the attention of the human main forces, while the real Orc troops engaged in guerrilla warfare behind, fighting small-scale battles.
This halted the momentum of the human armies' offenses.