The Full Scope
When Xander and the elite force returned to the main army, the scene was—unsurprisingly—very chaotic.
At this point, a decent foothold had already been established as a sizeable number of the de mm sonic beasts in the ravine had been killed. Those near the center, anyway. This allowed the army to continue the next phase of its advance.
Sustained pressure.
Simply put, after a certain area was controlled, the army would create artificial choke points near where there were still monsters, attract those monsters, kill them, and then gain control of that next bit of territory, killing any stragglers and consolidating themselves.
