Struggle

 The enemy at the west gate saw the secret code from the inside of the city and came safely towards the gate, only to find that the gate was still closed and found something was wrong. They thought about evacuating quickly, but there was a hint of fluke in their heart. Perhaps the other side's reception has been hampered and needed a little more time. The onslaught of the east gate and the harassment of the north gate of the south gate were aimed at keeping this empty gate, and the inside and the outside were suddenly attacked.

 It was such a fluke, such a hesitation, that an arrow rained like a locust on the head of the city.