As the initial recon and demolitions teams were returning, the vast majority of the force was headed out into the city to take advantage of the stage that the first wave had set for them. The Narsians had underestimated the might of a Phalanx Class Mecha, since they had never seen one before and the data on them is strictly confidential, even within the Kepler Military, so there was nothing on the planetary servers for them to have stolen.
Instead of charging the mighty war machine, they had turned their attention to the forces advancing from the rest of the city, encircling their position and trapping them in the city core.
Even the mighty artillery that they had thought would take out any true threat to their security had given up on targeting the Phalanx Class Mecha and had begun shelling the denser clusters of Heavy Mecha.