The soldiers of the Timurid Empire and the Northern Yuan Dynasty outside the city also noticed the small black dots in the air, so they dodged to both sides when the small black dots hit the ground.

With a snap, when the first black dot hit the ground, there was a crisp sound, and then a large amount of liquid splashed out of it, staining the bodies of the surrounding soldiers.

"It smells bad!" A soldier had some spilled liquid on his sleeve, and after sniffing it, he immediately pinched his nose and said, the smell of the liquid was very pungent, he had never smelled anything so bad.

Small black dots in the air fell to the ground one after another, these small black dots were porcelain jars the size of wine jars, and after falling on the ground, they shattered and splashed out a black liquid that emitted a pungent temperature, so that the people around them covered their mouths and noses.

Under the surprised gaze of Wen Du and Taiping, those porcelain jars containing black liquid kept flying out of the walls of Qinglong City, shattering among the soldiers.

Although the porcelain jars were avoided by the soldiers on the ground, the smell of the black liquid inside was indeed a little uncomfortable.

"Look, General." Just when Wendu and Taiping were puzzled by this tactic of the Ming army, a general galloped over on horseback and handed over a piece of porcelain jar that emitted a pungent smell to Wendu.

"Your Majesty, what is the liquid on it?" Wen Du looked at the fragments, and then asked Taiping on the side in confusion.

"If this official is not mistaken, this is fire oil!" Taiping stepped forward and sniffed the smell of the liquid on the shards, his face suddenly changed, and he said to Wen Du with an anxious expression, "They seem to want to attack with fire!" ”

Fire oil refers to a product refined from oil by the ancients for ignition and lighting, which was once an important strategic material in ancient times, and then used to refer to lighting kerosene.

During the Northern Anniversary, the Turkic rulers sent troops to surround and attack Jiuquan in Gansu Province, and the local soldiers and civilians burned the "fire oil" point to destroy the enemy's siege tools, repelled the enemy, and defended Jiuquan City.

There was a case of putting "hot oil" in an iron tank and launching it to burn the enemy ship.

Many ancient documents, such as Zeng Gongliang's "General Essentials of the Martial Arts" of the Northern Song Dynasty, have quite specific records on how to use oil as a raw material to make a powerful offensive weapon, "fierce fire oil".

During the reign of Emperor Shenzong of the Northern Song Dynasty, a military supervision was set up in the capital city of Bianliang to be in charge of the manufacture of military equipment, including a workshop specializing in the processing of "fierce fire oil".

According to Kang Yuzhi's "Yesterday's Dream Record", during the Northern Song Dynasty, the northwest frontier "all dug the ground to make large pools, vertical and horizontal, in order to store fierce fire oil", which was used to defend against the intrusion of foreign rulers, and some ancient tombs would also mix the soil with fire oil to stop the footsteps of tomb robbers.

"Kerose?" Wen Du naturally knew about the fire oil, but the fire oil was not the smell he smelled now, and his face showed a look of surprise, but after hearing Taiping's explanation of the military fire attack, his face immediately changed greatly, and he didn't have time to think about it and hurriedly shouted at the generals on the side, "We have been tricked, hurry, Mingjin, withdraw everyone." ”

Obviously, since the Ming army can calmly launch those porcelain jars filled with fire oil, it means that the situation in the city is controlled by the Ming army, and the west gate of Qinglong City has not been opened for a long time, there is no doubt that the soldiers of the Timurid Empire and the Northern Yuan Dynasty have been tricked.

"It's time to go!" However, it was too late for Wen Du to wake up, and at the same time as he gave the order to retreat, Li Yuntian said in a deep voice to Lin Xin beside him.

The reason why Wen Du didn't recognize the fire oil was because the Jiangwutang had improved the fire oil, and Li Yuntian had added other substances to it in order to confuse the enemy, changing the smell of the fire oil, so it was difficult to distinguish the fire oil in the dark.

Taiping is different from Wendu, he knows more about Daming, especially Li Yuntian, and knows that Li Yuntian has a yamen that specializes in ordnance transformation, so he guessed that the liquid on the fragments is the residual liquid of fire oil.

After receiving Li Yuntian's order, Lin Xin nodded to the three guards standing on the side, and the three guards drew the signal flares in their hands, and the three red signal flares rose into the air with a sharp whistling.

Wen Du was immediately shocked when he saw this, and hurriedly looked nervously in the direction of Qinglong City, this time the signal flare made him feel extremely uneasy.

Bang, bang, bang......

When the three red signal flares bloomed in the night sky, a series of thunderous muffled sounds sounded on the wall of the west gate of Qinglong City, and the mountains shook in an instant, waking up the entire residents of Qinglong City from their sleep.

Wen Du's face had turned iron-blue, his fists were clenched tightly, and from the lookout, he could clearly see a row of small bright spots lit up on the western wall of Qinglong City, and he knew that those small bright spots were the bright light when the cannon was fired.

Judging from the situation in front of him, the walls of Xicheng have been filled with the artillery that he fears the most, and I am afraid that the artillery of the entire Qinglong City is on the city walls, which is a huge disaster for the soldiers of the Timurid Empire and the Northern Yuan gathered under the city.

"Artillery, it's artillery, the Ming army has used artillery!" After hearing the dull roar from the city wall, Sosan, who was anxiously waiting for the city gate to open, was stunned for a moment, then his face turned pale, and he shouted at the soldiers gathered around, "Retreat! ”

Boom, boom, boom......

As soon as Tosan's voice fell, the cannonballs in the air had already landed in the crowd behind the enemy troops outside the city, and a series of explosions occurred, and the resulting firelight illuminated the surroundings, and the corpses of the unsuspecting soldiers on the scene were scattered all over the field, and flesh and blood were flying.

What was particularly frightening was that the explosion ignited the fire oil that fell to the ground, and soon a raging fire was ignited, and many soldiers with fire oil on their bodies screamed and were consumed by the flames.

This caused chaos on the scene, and the soldiers around them rushed to flee like headless flies.

"Damn!" Looking at the fire that ignited among the soldiers, Wen Du smashed his fist on the guardrail of the lookout, and two words burst out of his mouth with a cold expression, he knew that he had fallen for Li Yuntian again this time, and the soldiers who went to support the Kwantai Army in the city seemed to be more than lucky, and after experiencing tonight's catastrophe, I don't know how many people would survive.

At this moment, arrows were written on the wall of the west city of Qinglong City, and the Timurid Empire and the Northern Yuan soldiers gathered under the city could not dodge at all because they were gathered together, so many people fell down screaming.

Li Yuntian glanced at the enemy soldiers who were lying on the ground wailing after being shot by arrows under the city tower, and turned around and left expressionlessly, not having the slightest interest in the massacre in front of him.

Lin Xin knew Li Yuntian's habit of leaving once the battle situation was decided, and staying any longer would only be a waste of time, so she quietly followed.

Bai An and Lu Minen were different from Li Yuntian, they were generals who commanded the battle, so they bowed down and sent Li Yuntian away and continued to climb the city gate tower to supervise the battle.

Under the continuous shelling of the Ming army, the enemy soldiers outside the city were blown up to cry and cry for their fathers and mothers, and the explosion ignited the fire oil on the ground, and gradually ignited a raging fire outside the city, devouring the lives of countless soldiers.

"King Zhongwu really lives up to his name!" Looking at the flames produced by the cannonballs that fell one after another outside the city, Bai An couldn't help but praise Li Yuntian to Lu Minen, if it were him, he would not have laid such a perfect situation to lure the enemy into being fooled anyway.

"This is their own fault, if it weren't for their desire to instigate the rebellion of the Kansai Army, they would not have given the prince this opportunity." Lu Minen looked at the Timurid Empire and the Northern Yuan soldiers who were wailing in the firelight, shook his head and said, tonight is Li Yuntian's response to the Northern Yuan's attempt to instigate the rebellion of the Kwantan Army.

The artillery on the west wall of Qinglong City rang out for a whole hour, almost pears the enemy troops outside the city, because many soldiers of the Timurid Empire and the Northern Yuan Dynasty were burned to death, so that the smell of burning pigskins in Qinglong City permeated the city for several days.

After dawn, the Ming soldiers on the city wall were horrified to find that the outside of the city was black, and the ground was full of the bodies of the soldiers of the Timurid Empire and the Northern Yuan, most of whom were burned beyond recognition by the fire.

"General, the losses have been calculated, our army has killed more than 20,000 people, more than 30,000 wounded, and six generals including Dosang have died in battle!"

In the military camp outside the southern city, Wen Du convened the senior generals of the Timurid Empire and the Northern Yuan who besieged Qinglong City, because of the fire outside the west gate of Qinglong City a few days ago, the atmosphere at the scene was heavy and depressing, and a military attache of the Timurid Empire bowed to Wen Du, who was sitting at the top of the place, and said in a deep voice.

After hearing this battle report, the generals present couldn't help but feel a commotion, no one could have imagined that the losses that night would be so heavy, and the tens of thousands of troops gathered outside the west gate of Qinglong City at that time had completely become the target of escape, and they couldn't escape if they wanted to.

Moreover, the generals of the Timurid Empire and the Northern Yuan Dynasty have already heard that the vast majority of the wounded soldiers who were wounded this time were burned, and there were far more soldiers who died in the fire than those who were killed by shells, so this kind of injury is very troublesome to treat, and more people will definitely die in the later stage of the current medical environment.

"General, a letter has been shot from the city, and it is for the general." While the generals were whispering, a guard walked in quickly, holding a roll of paper in his hand and speaking loudly to Wendu.

"Bring it." Wen Du's face changed slightly, and he coldly stretched out his hand to the guard.

"How can it be!" After opening the paper and looking at it, Wen couldn't help but be furious and threw the paper out with a flick of his hand.

At this time, Taiping, who was sitting at the bottom hand, got up and stepped forward to pick up the paper, and his brows immediately wrinkled when he saw the contents on it.

The characters on the paper are written in the script of the Chagatai Khanate, and if translated into Chinese, it means "courtesy and exchange, and joy".

Obviously, this was Li Yuntian's tough response to the Northern Yuan's attempt to instigate the rebellion of the Kwantan army, and it was also a war letter to Wendu, announcing that the battle of Kwanxi had officially begun, and the leisurely days of the besieging Timurid Empire and the Northern Yuan army had come to an end.

"Recently, the Ming army in the city may want to carry out a sneak attack on our army, you must cheer up, be ready for battle, and don't give it a chance!" After calming down his excitement, Wen Du glanced at the generals on the scene, and said with a serious expression, "If someone violates the yang and the yin, the general will definitely be punished!" ”

"Yes!" Hearing this, the generals of the Timurid Empire and the Northern Yuan Dynasty stood up one after another, bowed down and saluted Wendu, and everyone's faces showed a solemn look.

They were frightened by the battle situation that night, who would have thought that Li Yuntian would quietly kill one-sixth of the troops of the besieging Timurid Empire and the Northern Yuan army.