A Fixed Soul Cannon Shell streaked through the air and exploded up ahead, instantly blasting several Abyss Demons into pieces.
The soldier carrying the Soul Cannon was preparing to reload immediately, but just then, a veteran beside him grabbed his clothes and hauled him backward.
Still not having recovered from the fighting just now, the soldier had already left the trench, instinctively following the veteran's pull.
Only then did the soldier notice that the Abyss Creatures ahead were less than a hundred meters from their trench.
In an ordinary battle, that distance would still have been manageable, but facing the flood of Abyss Demons ahead, these soldiers saw no difference between a hundred meters and fighting face-to-face.
After seeing this, the soldier immediately began retreating with the veteran from the defensive line halfway up the mountain toward the second defensive line at the summit.
The Yellow-Grade Mecha and some White-Class Mecha nearby hurriedly flew away with some of the soldiers, while attacks from the defensive line behind them continued to help hold back the Abyss Demons' advance.
Under these circumstances, however, faced with Abyss Demons in such numbers, the Northern Legion's firepower clearly could not stop their advance.
When the soldier looked back, he could even see some Abyss Demons slow down a little as they crossed obstacles, only to be swallowed by the Abyss Demons behind them.
It seemed that nothing could stop this torrent.
As the soldiers in the forwardmost trenches withdrew to the defensive line behind them, an officer's voice rang out from a Purple-Grade Mecha. "Detonate!"
Following that command, a tremendous explosion erupted halfway up the mountain. The enormous blast made the mountain shake, followed by the sound of snow and rubble tumbling down.
The shells buried halfway up the mountain beforehand were detonated, their power