Introduction to Longmen Pass: Longmen Pass is shaped like a dragon gate, hence its name. It is built on a towering boulder that looks like a dragon's head. The four walls are almost vertical. There is only a straight and steep 80-step ladder to reach the gate of Longtou Village. The watchtowers on both sides are heavily trampled with arrows. The situation is dangerous and easy to defend but difficult to attack. In the entire defense system of Yifeng City, it serves as both an outpost and a frontline defense. When the enemy is approaching, first light the beacon to notify Longtai. When the enemy penetrates deeper, they can form a pincer attack with Longtai. In the plains of the village, soldiers and horses are in full swing during the war, and they rest and recuperate in their free time. The offensive and defensive systems of Longmen Pass and Longtou Village are interconnected and impeccable, which reflects the extremely high strategic and tactical qualities of the Ba people in building a country with "military force".