Zhang Chu sat in the military tent of the security army camp outside Yuncheng, listening to the sound of guns outside, and behaved very comfortably and calmly.

The cat-and-mouse game of the siege and the defending city has been played several times, and the security army deliberately makes a posture to storm the city, luring the officers and soldiers to defend the whole city, and then killing and wounding them with artillery. In the end, the officers and soldiers became more and more savvy, and they could not see the security army really attacking, and they no longer climbed the city.

The fiercest competition between the two sides was the tunnels dug by the security forces under the city. After overnight excavation, there are several tunnels dug under the city wall, the security army is busy expanding the tunnel space under the city wall, the power of black powder is still limited, if you want to blow up a section of the city wall, you need thousands of pounds of gunpowder, the space of the tunnel is too small to put down.

The officers and soldiers in the city also sensed the imminent danger and frantically searched for places where the security forces might dig tunnels.

After many efforts, they roughly determined the general direction of the security army's tunnel by listening to the sound, and began to dig down the shaft on the ground, when the shaft began to dig, the wellhead was several zhang wide, and the lower the wellhead, the smaller it became, and constantly listened to adjust the direction.

After desperately digging a large number of shafts, the officers and soldiers finally achieved results again, and the tunnels with the security army were dug through.

Guo Tiezhu, a recruit of the security army, because of his strong body, and worked as a miner for a few days, was selected to become a member of the excavation tunnel, Guo Tiezhu has always spared no physical strength to do his work, and has been digging underground for a day, and the squad leader who led the team wanted to replace him many times to rest, but he refused, and by judging that the tunnel has been dug under the city wall, everyone has more momentum to dig.

But at this moment, the soil on the top of the tunnel kept falling, and it was obvious that the officers and soldiers were digging down, and the squad leader immediately ordered everyone to prepare to meet the enemy.

After a while, a large piece of the top of the tunnel collapsed, and with it several soldiers of the official army, all holding steel knives in one hand and torches in the other, ready to fight the security army. Before they could see the situation in the tunnels from the falling dust, the muskets of the security army rang out, which were originally short muskets for cavalry, with short barrels and easy to use in a small space, specially brought to deal with the battles in the tunnels.

Eliminating the officers and soldiers who jumped down, the soldiers of the security army quickly ran to the bottom of the shaft and shot a burst of lead bullets at the top, which immediately let out a scream, and several officers and soldiers fell from the mouth of the shaft.

Caught off guard by the security army's muskets, the officers and soldiers were so frightened that they moved away from the shaft one by one. They did not stop there, and when they saw that the method of rushing into the tunnel did not work, they immediately used the previous method and threw the quilt mixed with gunpowder and poisonous Chinese medicine from the mouth of the shaft. The security forces have been prepared for this.

The soldiers, some carrying dustpans full of fine earth, others carrying buckets full of water, quickly passed over and poured them on top of the quilts, and the fire was immediately extinguished.

When the officers and soldiers saw that there was no smoke rising from the shaft, they knew that this method had failed again. A huge explosive bag was moved, a fuse was inserted, ignited and pushed down the shaft, seeing the falling explosive bag, most of the soldiers of the security army ran towards the cave wall of the tunnel, where there were some small ear chambers dug in advance, and the soldiers hid in the ground, even if the explosive bag exploded, they would not be injured. At this time, Guo Tiezhu did not dodge like his companions, he rushed towards the explosives bag, and at the moment when the fuse of the explosive bag was about to burn out, he pulled the fuse from the explosives bag, threw it on the ground and trampled it out with a few feet.

Guo Tiezhu shook his burned hand and scolded: "Damn, I really paid the capital to throw such a big bag of explosives." ”

Scolding in his mouth, Guo Tiezhu didn't dare to pause at his feet, and quickly ran to the ear chamber of the tunnel to hide.

At this time, two soldiers ran over with the flamethrowers characteristic of the security army. This flamethrower Zhang Chu used it during the sneak attack on the Dutch warship, and when he saw that the effect was good, he popularized it in the army.

The security soldiers squirted flamethrowers at the top of the shaft. The officers and soldiers were driven away from the mouth of the well, and the soldiers who came up from behind immediately blocked the hole with planks and pillars.

When the officers and soldiers saw that the entrance to the cave was blocked, they immediately sent people down to the bottom of the shaft to excavate, trying to dig the hole again. But this time it was not so easy, the soldiers of the security army stood there with flamethrowers, and as long as they saw the officers and soldiers digging a little gap, they immediately sprayed flames at it, and the officers and soldiers digging the well above were either killed or injured by the fire that came out of the ground. Later, no one dared to dig underground again. Whether the officers threatened to kill their heads or lured them with money, the soldiers said that they would not go down the well, and the tragic situation after being burned by the flames really frightened the officers and soldiers.

The security forces took the opportunity to speed up the excavation, digging a huge hole under the city walls. Several large coffins were transported into the hollow, and the coffins contained thousands of pounds of black powder.

Seeing that the time was ripe, Zhang Chu ordered the other tunnels to withdraw, the long fuse on the coffin was lit, and the soldiers who lit the fire rushed towards the outside of the tunnel.

Outside the tunnel, they lay down in the trenches with the other soldiers, waiting for the explosion to happen.

The wait was so long that some people even wondered if there was an accident, the fuse was not ignited or burned until it went out in the middle.

Many looked suspiciously at the soldiers who lit the fire. The soldiers who lit the fire themselves had no roots in their hearts. Originally, the commander said that the time of the fuse was fixed, and the time when the explosive would explode could be determined by counting. But he was too nervous just now, and the count was messed up, and the time of the explosion did not match his number, and his count had exceeded the time of the original explosion, could it really exceed the expected time The explosives did not explode.

The soldiers who lit the fire were eager to rush into the tunnel themselves to relight the fire. It would be a shame if everyone's efforts in the past few days could not be blown up because of their own explosives.

He turned his face to look at his chief, who was very calm, his lips moving slightly, as if he was still counting. Only then did the soldiers who lit the fire relent.

Suddenly, the commander shouted, "Lie down." The leader lay at the bottom of the trench, and the others did not dare to slack off, curling up and hiding themselves in the trench.

Almost at the same time, a huge explosion rang out.

With the sound of the explosion, the walls of Yuncheng actually arched upwards from the ground, and then the city walls shattered into pieces of masonry and scattered in all directions, and the city walls were blown out of a large hole thirty or forty feet wide.

The officers and soldiers on the city wall and in the cave where the soldiers were hiding in the city wall flew up with the city wall without even having a chance to scream, and the remaining limbs flew far away.

Before the smoke and dust of the explosion had cleared, the sound of trumpets and small drums in the security army formation began.

The security forces jumped up from the trenches, quickly climbed over the trenches, and assembled in neat rows in front of the gaps in the bombed walls, and marched towards the gaps in the walls with the rhythm of small drums. (To be continued.) )