Roland was not surprised by the tactics "Legion" had adopted.
If he were in Legion's place, he too would have used the numerical advantage to continually exert pressure on the enemy until they could no longer withstand it and collapsed.
Even the toughest metal will crack and break after being bent back and forth enough times due to accumulated fatigue.
The same goes for humans.
Continuous and monotonous barrages of fire not only cause physical fatigue but create a greater burden of mental stress and fatigue.
Highways often have curves every certain distance, not only due to the terrain but also because driving in straight lines for long periods can lead to visual and mental fatigue in drivers, thereby increasing the risk of traffic accidents.
Legion's tactics had a similar ingenuity.
Fire coverage—close combat—fire coverage—close combat.
It seemed like an endless cycle slowly eroding the adversary until a final moment...