At the same time, as they penetrated deeper, the enemy's movements became increasingly elusive.
Wherever the flesh and blood structures or the ground had not been cleansed and were imbued with activity, a cavity door might open at any moment, and Plague Demons would emerge, causing significant casualties to the human forces.
Equally troubling was the indication that routes blasted by the Orbital Cannons and then stormed by armored troops were starting to get resealed.
There seemed to be signs that the Plague Demon Army planned to break through the human forces' rearguard, trapping them within the city before beginning an encirclement and elimination campaign.