There was indeed a chaotic battle on the surface, and it was between two legions.
One of the legions had around 400 men while the other had around 700 men. Even so, it wasn't a one-sided battle; the legion with the smaller headcount was actually having the advantage.
The surroundings were a zone of stone forest, and there were boulders everywhere. When Jiang Yi took out the medal to sense the area, no one on the surface noticed him. Who would have the time to go check the vicinity when they were locked in such an intense battle?
Jiang Yi didn't dare to exit from the tunnel's entrance; the closer he got to the surface, the rumblings got louder. It was obvious that the battle was happening right above him, and if he was to exit from there, he would be immediately surrounded.
Jiang Yi used the Black Scale Sword to dig a fresh tunnel, sneaking over, and finally exiting from a pile of stone while observing quietly.
What is this?!