After Zheng Xiunian gave the order, he went down to the city tower and entered a courtyard not far from the city tower, and used that place as his headquarters. The castle tower would become a battlefield after a while, but he was frightened by the two arrows of the hateful Pang Wanchun one after another, and he didn't dare to continue to stay on the castle tower.

Zheng Xiunian took into account all the links he could think of, and issued an order to the whole army, and now the entire Nanle City is also running rapidly according to his orders, he is very glad that he took precautions some time ago, and prepared sufficient food and grass, weapons, equipment, medicines and other materials for the various fortresses and cities on the front line, with these things, plus the 20,000 horses who can almost fight to the death with him, he firmly believes that Nanle City is not impregnable, It is not a problem to hold on for the arrival of reinforcements in various places for the last few days.

Although Zheng Xiunian didn't dare to go up to the city tower again, his heart was still on the city tower, and at this moment he was standing in the courtyard looking at the city tower in the distance and waiting for the battle to start, but after waiting for almost a stick of incense, the city tower was still quiet, as if nothing had happened. He couldn't help but wonder to himself, why didn't the thieves attack the city? Immediately he sent people to the various gates to investigate the situation.

Soon, something came from the gates of the city that he couldn't understand.

"Report, the thieves outside the east gate did not look like they were preparing to attack the city, but they were just ...... The thieves formed a shield phalanx with huge shields and were moving towards the city gate, and our men were desperately shooting at the phalanx with bows and arrows, but all the shields were tightly connected and impermeable, and the bows and arrows could not shoot into it at all. ”

"Report, the thieves outside the west gate have not attacked, and there is also a shield phalanx moving towards the city gate."

"Report, it's also outside the south gate!"

"Report, the thief square outside the north gate has come to the gate of the city, and they seem to be doing something inside, but because of the shield, we can't see anything abnormal on it. According to the sergeants guarding the gates, they looked through the cracks in the gates and saw thieves piling large wooden barrels into the holes in the gates. ”

……，

"Report, the shield phalanx at the east gate is leaving the city gate."

"Report, the phalanx of shields at the west gate has left the city gate."

"Report, there are still a few thieves left outside the south gate."

"Report, the army of thieves outside the north gate retreated back almost a hundred paces!"

"Report, the thieves outside the east gate have also withdrawn!"

"Report, the thieves outside the West Gate are withdrawing!"

……，

"Congratulations, sir! The thieves must see that they can't break through the city gate, this is to withdraw their troops! When a staff member heard this, he congratulated Zheng Xiunian with a happy face,

"Yes, my lord, the thieves may have just explored the four city gates, and when they saw that the city towers were strong, they retreated." Another aide also rejoiced,

"No, my lord, I think the thieves are playing tricks, maybe they are trying to trick us into opening the city gate!" Someone else frowned and said,

Zheng Xiunian shook his head, this incident confused him, how could the thieves retreat so easily? Although he didn't know what the thieves were trying to do, he had a sense of foreboding, which made him feel like pins and needles and fidgeting, and finally, he gritted his teeth and decided to go up to the castle tower to see what the thieves were up to!

After thinking about it, Zheng Xiunian ordered someone to lead the horse, and after riding it, he slowly walked towards the direction of the city tower to .......

++++++++++++++++++++

At the same time, outside the city, the shield phalanx outside the four city gates in the south, east, and west had all been withdrawn, and only one or two soldiers remained at each city gate, waiting for the final order from Zheng Fei.

Zheng Fei looked from afar, and saw that dozens of large wooden barrels were already piled up in the city gate cave, which was filled with nothing else, but buckets of the most powerful gunpowder!

Firearms have always been valued by Zheng Fei, and have provided great help to the Heavenly Dao Army in major battles again and again, but relying only on catapults to throw firearms into the enemy's city has made Zheng Fei not very satisfied, and the power of scattered firearms is limited after all, and it is more used to break the morale and courage of the other party.

If you want to really break through the opponent's city, you still have to start a siege of the city wall to capture the opponent's tower, and then open the city gate to enlarge the army and enter the city.

Since this is the case, Zheng Fei had an idea, why bother with it? Wouldn't it be better to blow open the opponent's city gate with a large amount of gunpowder, or even simply blow down the opponent's city wall, so that the army can save the sacrifice made to capture the city wall?

Therefore, Zheng Fei ordered Ling Zhen and all the firearms divisions of the entire firearms bureau who were captured to conduct experiments according to their own ideas and requirements, and after repeated experiments, they finally made this kind of powder keg, as long as a sufficient number of powder kegs exploded at the same time, the power produced was no less than a bombshell in later generations!

But this weapon also has a congenital defect, that is, after the explosion, while blowing up the city wall gate, it is also equivalent to destroying the city tower, even if he successfully captures the city, before the city tower is repaired again, the city is also four gates wide open, and the defense force will be greatly reduced, which is not conducive to the next defense of the city.

Therefore, this weapon has been kept an absolute secret by the Heavenly Dao Army since the successful test, and Zheng Fei wants to use this weapon in the future when facing a city that no longer needs to think about defending the city after it is captured, or a city that is particularly difficult to breach!

And today, it is completely in line with the conditions for the use of this weapon, at this moment Zheng Fei has only one purpose, that is, to capture or kill Zheng Xiunian alive, in comparison, Nanle City is not important at all, the city tower is destroyed and destroyed, it is not a big deal. And after success, his weapon that can be called against the sky and the achievement of killing the commander of the Song army will definitely shock the whole world at the same time, destroy the courage of all enemies, and declare his strength to them!

Zheng Fei looked at Nanle City in the distance, although he had already witnessed the power of this weapon, he still couldn't help but flash a trace of excitement in his heart, his appearance has completely changed the direction of history, and the advent of this weapon today will also have a huge impact on the people of the present and future generations, the Han people will no longer be only famous as the inventors of gunpowder, but will also exist as the most powerful users of gunpowder, plus the compass, will their descendants pick up the weapons made of gunpowder to ride the wind and waves, What about crossing the globe and building a vast empire like never before?

Zheng Fei retracted his thoughts, looked up at the sky, and happened to see a swallow flying by, flying freely and happily...... Is that you? Will you also come with me to witness this moment coming?

Zheng Fei slowly lowered his head, glanced at Nanle City again, and then nodded to Pang Wanchun,

Pang Wanchun immediately pulled up his longbow and shot a ringing arrow into the sky, and the ringing arrow flew straight into the sky, making a sharp and piercing sound, which spread throughout the entire Nanle City!

The soldiers of the Heavenly Dao Army in the four city gate holes in Nanle City heard the sound, and at the same time blew the fire folds that had been prepared long ago, and then stretched out to the lead ...... of the powder keg!

As soon as the fuse was ignited, it quickly burned, and several soldiers made sure that there was no problem, so they immediately picked up their shields and put them on their heads and ran back desperately to ......!

+++++++++++++++++++++++++++++

Zheng Xiunian rode a horse and gradually approached the city tower, looking around, his eyes were full of deep doubts, quiet, it was too quiet, he had never heard of a great war in the past and present that would be so quiet on the eve of a big war!

This abnormality made the uneasiness in his heart even stronger, and his heartbeat increased inexplicably, only to feel that the calm castle tower in front of him seemed to hide some unknown danger.

At this moment, he suddenly heard a series of sharp sounds sounding in the air out of nowhere, Zheng Xiunian was shocked, and couldn't help but pull the reins and stop the mount, he heard it, this is the sound of the arrow, the arrow is generally used to transmit the news, the thief shot the arrow at this time Is he finally going to attack?

Somehow, as soon as he heard this movement, Zheng Xiunian secretly breathed a sigh of relief, and then immediately couldn't help laughing at himself, secretly saying that he hadn't fought any big battles, and he was indeed a little nervous on the eve of the war. Hmph, no matter what tricks they use, I will block them with soldiers, and the water will cover them!

Zheng Xiunian thought about it, and then gently pinched the horse's belly, and the mount moved again.

But at this moment......

Suddenly!

With an earth-shattering loud bang, like a huge thunder falling from the sky, it exploded on the ground, and the earth trembled violently!

Oh no, it's not one hit, it's four in a row!

Zheng Xiunian was shocked, and his first reaction was...... Earthquake?

Immediately afterwards, his mount seemed to be frightened, and with a hiss, two front hooves soared into the air, Zheng Xiunian was caught off guard and fell off the horse heavily, and he almost fainted from the pain!

Seeing this, the surrounding subordinates were shocked and were about to come to help him up, but without warning, a violent hurricane suddenly blew from the direction of the castle tower, blowing everyone into the air and falling to the ground, screaming!

Zheng Xiunian lay on the ground and raised his head with difficulty, looking at the direction of the city tower with the only remaining trace of consciousness, in the blur, he saw that a large amount of smoke and dust suddenly rose from the direction of the city tower, and countless bricks and stones rose into the sky like thousands of arrows, and in the smoke and dust, the towering and indestructible city tower seemed to have collapsed ......!

A sharp pain struck, Zheng Xiunian only felt that his eyes were black, and he fainted .......

+++++++++++++++

In addition to Zheng Fei, everything that happened in front of him also completely shocked all the Heavenly Dao soldiers outside the city, in the thick smoke, only loud noises were heard, and the screams were endless, as if there was a terrifying giant beast destroying everything that could be destroyed inside!

Soon, the smoke and dust gradually dissipated, and everything unfolding in front of them once again stunned everyone, only to see that the tower, which was still tall and sturdy just now, was gone, and the long city wall was like a long snake cut off by the waist, revealing a huge gap!

After everyone reacted, they couldn't help but look at Zheng Fei, in their eyes, Zheng Fei was like the embodiment of gods and demons!

Zheng Fei calmly pulled out his knife and pointed to the sky,

"Obey the order, kill!"