They are all experts. Though their ranks may not be as high as every member of the Beast Army, their eyesight far surpasses that of ordinary people. They can clearly see the massive trenches dug around the enemy encampment, not to mention the wooden barriers erected—all of this accomplished overnight.
"F*cking hell!" The Great Marshall swore as he looked at the barriers surrounding the beasts. "Looks like that white-haired bastard actually knows a thing or two about warfare." His eyes gleamed with frustration as he muttered, "How could someone come up with such an absolute defense?" He spoke loudly, continuing his train of thought, but stopped abruptly as anger overtook him. "Find Li Meilin immediately!" The Great Marshall commanded loudly, and a large group of experts instantly mobilized. Nodding in acknowledgment, they scrambled to be the first to bring the woman before their master. The faster they acted, the less likely they would be blamed for incompetence.