There are several clever tricks in the anti-tunnel siege method, as long as you can grasp the general direction of the enemy digging the tunnel in advance, send the army to guard the exit of the tunnel, as long as you find the tunnel entrance, come out and capture one, you can also pour smoke into the tunnel, smoke to death. As long as the enemy army digs a tunnel and digs a nullah, a large amount of water will pour into it, and how many people in the tunnel will be drowned alive, and no one will be spared.

The Shu army is now digging tunnels to the south city wall, and the south of the city is the lowest point in Chang'an City, Sima Wang ordered people to dig a nullah several miles long on the street near Anmen, which is one zhang wide and four or five zhang deep, leading the water of Cangchi into the nullah.

This nullah almost runs through the south of the city of Chang'an, as long as the Shu army tunnels are dug here, they will be dug through the nullahs, and the water of Cangchi will continue to pour in, Sima Wang believes that this trick is used to deal with the Shu army's tunnel offensive, which is more suitable.

The excavation speed of the Shu army was quite fast, and the excavation was carried out in shifts for twelve hours, day and night, not to mention that in the tunnel, only torches and oil lamps could be lit, and there was no difference between day and night.

When circumventing the moat, the sappers were very careful to determine the depth of the tunnel according to the depth of the moat that had been measured in advance. This section of the tunnel is extremely dangerous, and if you are not careful, you may dig through the moat, and once there is a water penetration accident, the consequences are unimaginable.

After reasonable calculations, the Shu army determined the appropriate digging depth, and the tunnel meandered in, passing the moat safely.

As the sunset passed, the offensive in Dongcheng the next day also came to an end, and the battle situation could certainly be described as fierce. But the casualties were very minor. The offensive and defensive sides use the form of counter-shooting. In addition, there were precautions in advance, so the casualties were minimal.

Although the catapult was also busy for a day, the solidity of the city wall of Chang'an City was extraordinary, and the results of the catapult were not ideal, at most it left a little pothole scar on the city wall, and if you want to smash the wall to the point of collapse, you really don't know how to wait until the year of the monkey.

This also proves that if Liu Yin adopts conventional tactics, it will be very difficult to conquer Chang'an. After the withdrawal of troops after dark. Liu Yin ordered to speed up the excavation of the tunnel, and strive to complete the excavation task of the tunnel tomorrow morning.

Eighty percent of the tunnels were completed, and after crossing the moat, the next step was to dig diagonally upwards until they reached the foundation of the city walls.

Only one person is allowed to pass in the narrow space of the tunnel, and the two swapped positions will be very crowded, and the sappers who are responsible for the pre-excavation task are the strongest and hardest soldiers in a hundred miles, and a total of three shifts are arranged, rotating every four hours, with ten people in each shift. They took turns digging hard with pickaxes, shovels, and other tools.

The sappers behind the sappers will put it in baskets. Transported out of the tunnels for processing, and for sections that appear to be dangerous, sappers will use sticks and planks to reinforce them. Fortunately, near Chang'an City are the alluvial plains of the Wei River, with more sand and less stones, and in the areas excavated by the Shu army all the way, basically no large stones were found, which can undoubtedly greatly improve the excavation speed of the Shu soldiers.

The number of steps dug to the moat, and how many steps to dig under the city walls, were carefully calculated, and there would not be the slightest deviation, and when digging under the walls, the sappers stopped digging forward, but widened to the left and right.

Liu Yin used a total of about 3,000 catties of gunpowder at the moment, and if these gunpowder were buried under the city wall, they had to be placed at least five or six zhang wide, according to the plan, after arriving at the position under the city wall, they widened the width of five or six zhang to the left and right, and completed the excavation of the entire tunnel when the sky was faintly bright.

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"Governor Qiqi, the Shu army's operation to dig tunnels seems to have stopped." When the Chinese officer received a report from the eavesdroppers, he immediately reported it to Sima Wang.

At this moment, Sima Wang just woke up, sleepy eyes relaxed, since the Shu army came to the city, Sima Wang has never closed his eyes, after exploring the direction of the Shu army digging tunnels, Sima Wang finally secretly breathed a sigh of relief, last night was a good night's sleep. But as soon as he woke up in the morning, he received such a report, which made Sima Wang stunned.

Could it be that the Shu army already knew that the Wei army was prepared in the city? It stands to reason that it will not, now that the two sides are in a state of confrontation, there is a city wall, it is difficult to communicate carefully, and the arrangements in the city should not be known to the Shu army outside the city.

But in the past few days, the Shu army has been digging tunnels day and night, and has never stopped, why they chose to stop work at this time, I can't help but be a little intriguing.

"Now where the Shu army has dug up." Sima Wang asked.

"Probably outside the city wall between Anmen and Xi'anmen." Zhongjun replied.

The Wei army used the empty urn to monitor, and it could only roughly judge the direction and distance by the strength of the sound, and there would be a certain error, so the people listening could only roughly judge that the Shu army had dug near the city wall, as for whether it was inside the city wall or outside the city wall, they really didn't know.

Sima Wang sighed lightly, the tunnel siege method must dig the tunnel into the city, and then take advantage of the defender's unpreparedness, send troops from the tunnel mouth to break into the city, and catch the defender off guard.

But now the Shu army has only dug to the periphery of the city wall, and this position has almost no effect, if the Shu army does not continue to dig forward, it will definitely be wasted.

Could it be that their goal is to destroy the city walls?

This thought flashed in Sima Wang's mind, but he quickly shook his head, wanting to destroy the city wall is not something that can be achieved by just digging a few tunnels, the walls of Chang'an City are extremely strong, and a few tunnels are simply not enough to shake this strong city wall, digging tunnels to dig Chang'an City down, this is almost a joke, even Sima Wang can't believe it.

Maybe the Shu army is aware of something, maybe there are other arrangements, all in all, the news of the shutdown of the Shu army is mixed, the joy is that if the Shu army stops digging tunnels to attack, then the plan of the tunnel attack will be aborted, and the Wei army does not need to be on guard, the worry is that it is not clear the next plan of the Shu army, and it is not possible to destroy the tunnels of the Shu army now, even if the Shu army stays there and does not move, it is a scourge after all. If the Shu army dug an open channel, Sima Wang could really rest assured.

Sima Wang ordered Hu Shi to immediately send a part of his army to the southern city wall to strengthen the garrison of the southern city wall, while paying close attention to the latest movements of the Shu army. (To be continued.) )