How did the ancients know how to prevent the enemy from driving away the tunnel and sneak attack?

In fact, the ancients prevented the enemy from driving away from the tunnel to sneak up, which was actually to fill the tunnel with water, and effectively avoided the enemy's sneak attack by blocking the road with water.

In order to prevent tunnel attack, people in the city usually dig a circle of deep ditches around the city and introduce drainage, which can effectively prevent the enemy from digging tunnels. Cave attack is to dig tunnels and destroy the city. The techniques of point attack and counter-point attack are the same, while the latter is more complicated.

Mozi's Cave Preparation describes the method of anti-cave attack in detail: a lookout post is set at the height of the city to closely monitor the enemy's movements. Once signs of digging tunnels are found, such as abnormal earthwork accumulation and turbid water flowing, a well is dug in the corresponding direction in the city, close to the wall root.

five steps and one well or three feet and one well, put a new pottery jar at the bottom of the well, and cover it with thin cowhide, so that people with smart hearing can lie down and listen. The sound emitted by the enemy when digging a tunnel propagates in the ground at a high speed, with little attenuation, which is easy to arouse the vibration of the cylinder, so the direction of the tunnel can be detected by this method.

anti-point attack technology

Mozi? "Prepare the Cave" says: When you smoke the enemy, you should prepare a "continuous version", that is, a large board made of wood strips, whose height and width are consistent with the tunnel to block the smoke; Cut holes in the board so that the spear can shoot outward to prevent the enemy from blocking the smoke pipe; If the enemy blocks the smoke pipe, cut the smoke pipe behind the board and then quickly lead the board back. It is conceivable that the confrontation in the tunnel is also quite fierce.

cave attack and counter-cave attack technologies are closely related to the developed mining technologies in Shang and Zhou dynasties. Digging siege tunnels or anti-tunnels means using the technology of digging tunnels. The archaeological excavation of the Shang and Zhou copper mine site in Tongling, Ruichang, Jiangxi Province shows that in the Shang and Western Zhou Dynasties, there were many forms of tunnel excavation, such as vertical shaft, drift, inclined lane and trough pit, which were used in combination with living and living.