After they manage to send of the Kobold, bloodied, the soldiers thought they would rest for the day. However, reality is much crueler.
"The monster's forces are still continuing their march! Prepare yourself for another engagement!" hearing this, some of the soldiers groaned, yet none refused the order.
Behind them is their families. If they are defeated, and the remaining three armies suffer the same defeat as they do, what would happen to them? To prevent it is the reason for the soldiers to be mobilized.
"Prepare for battle!"
-x-
Gobruk observe the humans movement with the aid of one of his advisors, a Demon Goblin Archshaman. The monster in question learned the art of making a familiar, sending it up on the sky to act as eyes for him.
With it, the Demon Goblin King managed to learn of the enemies movement, and prepare a deadly trap for them.