I could tell how limited space that cave down below had. It wasn't spacious enough for a grand army of mine to be present alongside the densely packed enemy forces.
Besides, whoever got the higher vantage point in attacking the other would have it much easier. So I let my digging team expand this area, while leaving my fallen gods to keep devastating the ground, expanding the hole downwards.
Of course their digging speed wasn't like the speed of the digging team using their colossal machines. Not to mention my fallen gods ran all the time on fuel, needed lots of energy to operate and keep using their ultimate skills.
But I had to expand this entire place and renovate it to be suitable for the grand upcoming battle. So I let my fallen gods work as grave diggers this time, while waiting.