C188 Surprise secret pathway

However, most of the army that and the City Guard brought with them were arranged in the City Guard's camp, so why was it that no one knew the location of the secret passage?

"General Zhang, why haven't we discovered any secret passage in the camp, and why did the enemy dig out such a long secret passage in one month? We don't even know the reason!" Yu Fengcheng asked.

"This is not strange