Ress Battlefield was a type of mess that could not be defined by normal standards. The battle was chaotic to the point where the Celestial Armies were having a hard time coordinating.
This was mainly because there were two fronts, both land and air that were happening at the same time. But recently after Avatar Varaha's groundbreaking attacks, it had unknowingly exposed the underground tunnels leading to the civilians.
But to the Celestials, they did not care whether they were merely young children or the elderly. Their orders were strictly followed: To kill every single human on sight. Perhaps in another world, they might have stuck to some principles, killing the children and leaving the elderly to rot in their godforsaken place where it had already been torched.