Seeing that the battles in the other areas of the valley had largely come to an end, Hua Tianxiong picked up three flaming arrows, lit them, and fired them at the final stack of the corpse wall. The three arrows quickly ignited the corpse wall, and the Xiongnu soldiers trapped inside began coughing violently from the smoke. With no other choice, they used their shields to beat out the raging fire on the wall, but it proved difficult to extinguish. Seizing the opportunity, three hundred Iron Stone Guards rained arrows down upon the opening, cutting down forty or fifty men in a short while. As the encirclement grew tighter, the space walled off by the shields became increasingly solid, rendering the arrows gradually ineffective.
Hua Tianxiong then ordered the soldiers on both sides of the valley to descend into the basin and completely surround the shield-formed space. The spearmen thrust their spears fiercely against the circular barricade of shields, and after a great deal of effort, finally managed to force an opening. A large amount of sand and stone spilled out. Once all the shields were pushed aside, the entrance to a tunnel lay revealed before everyone's eyes. Upon seeing this, Xiao Feng shouted out in alarm:
"Not good! The Xiongnu army has escaped underground!"
Chapter 87