Compared to the center, the flanks did not come under as much fire. The rifleman mechs on both sides were mostly targeting each other. Though they were more than willing to level their guns at the mechs that threatened to attack them from the sides, they couldn't afford to let the enemy ranged mechs destroy them first!
In this way, the massive battlefield involving over 50,000 mechs slowly delineated into several different sections, each of which were largely self-contained.
Though senior officers such as General Verle looked at the battlefield in a much more detailed and comprehensive manner, laymen like Ves lacked the training and expertise to see that much.
He had enough experience to be able to tell what was going on. As someone who was always sensitive towards life, he could intuitively sense that the dance of life and death had just erupted at the sides!