Because, on the battlefield, there is such an unwritten rule.

That is, when the two sides are fighting, after one side uses the rocket, it will start to charge.

Launching rockets, the first is to disrupt the position of the local area, the second is to fuel the arrogance of one's own soldiers, and the third is to burn down the enemy's barracks.

So after launching the rocket, the enemy will inevitably start to charge.

The rockets did not do much damage to the soldiers of Youguan.

But for the people in Youhaiguan, it was like a fire from heaven.

Because the power of the rocket is enough to burn down their homes and everything they own, even food and grass.

Once the houses in Youhaiguan are burned down, the soldiers in Youhaiguan will have no place to live and no food to eat, so the people in Youhaiguan will become refugees and migrate, and the whole Youhaiguan will become an empty city. .

In this way, it would be a breeze for the sudden alliance army to take down Youguan.

…

"Prime Minister Wei Zheng, Changsun Wuyi, let the people in the city spread sand on their roofs, and I will leave it to you to do this! There is no such thing as ten days and a half months in our battle. It's over, if the lair is burned, our battle will be lost, so you deal with it as soon as possible, go now!"

"Yes, Eighth Prince!"

After Li Chengfeng finished speaking, Changsun Wuyi immediately cupped his fists, then turned around and trotted towards the Youguan Pass.

Wei Zheng glanced at Li Chengfeng, finally sighed helplessly, and chased his eldest grandson Wuyi away.

In fact, Wei Zheng wanted to stay by Li Chengfeng's side to protect Li Chengfeng's safety.

With his old bones, it is impossible for him to fight on the battlefield now.

But if it can still bring a little effect to Datang, Wei Zheng will not hesitate.

Now that Li Jing is injured, the fate of the entire Youzhou City, and even the fate of Datang, rests on Li Chengfeng.

Wei Zheng had no choice but to follow Li Chengfeng's instructions.

Sure enough, when the sky filled with rockets began to attack Youzhou City, most of those rockets were annihilated by the sand laid by the people.

The rocket's flaming arrowhead plunges into the sand and is extinguished. How can it still burn?

And the remaining rockets were also put out by the people in Youhaiguan in time, so they didn't cause the fire.

Everyone admired Li Chengfeng's method.

In the past, they thought that only water could put out a fire, but sand could do it too. Wei Zheng and Changsun Wuyi felt that they had learned a lot.

On the other hand, look at the sudden alliance army.

They looked puzzled.

Especially Ji Li Khan and Songtsen Gampo, the leaders of the two countries, looked into the Youguan Pass with suspicion on their faces.

Logically speaking, after the rocket is launched, raging flames will inevitably erupt within the Nether Pass. At this time, it is time for them to charge.

But why didn't the imaginary flames and black smoke rise?

But people can't control that much.

As soon as Ji Li Khan gave an order, he immediately led hundreds of thousands of Turkic troops to charge towards Youguan.

And Songtsan Gampo was not to be outdone, and led his hundreds of thousands of Tubo soldiers, charged towards Youguan Pass.

On the city gate, Li Jing used the binoculars to see the black army, like an army of ants, rushing towards the Youguan Pass?

Li Jing's heart was in his throat.

"What to do, what to do? Judging by the number of the sudden alliance army, there are at least 600,000 or more! We only have 200,000 troops here, how to defend? What to defend?"

Li Jing was in a hurry, wishing he could get up and go to the battlefield to kill the enemy.

But unfortunately, his left leg was broken, and the pain was unbearable when he moved it. He couldn't even walk, let alone ride a horse or run.

"Hey, now, we can only see how the eighth prince will deal with it! If we fight head-on, we are sure to lose!"

Li Jing muttered to himself and sighed slightly!

…

But at this moment, Li Chengfeng, who was under the tower, had a calm expression on his face, and he didn't seem to panic at all.

Cheng Yaojin hurried over again, sweating profusely and said: "It's not good, the eighth prince, the 800,000 troops of the Tumeng have come, what should we do? Fight, or go back to the city to defend?"

Now, Li Chengfeng is the commander-in-chief of Youzhou City in the Tang Dynasty, so before making any battle decisions, they can only proceed after Li Chengfeng gives orders, otherwise it will be a violation of military orders.

Even Cheng Yaojin didn't dare to act rashly.

Whether to attack or retreat, it is necessary to seek Li Chengfeng's opinion.

Hearing this, Li Chengfeng smiled slightly and said, "After waiting for a long time, they finally started to attack Youzhou City? They are ready to fight close combat, right?"

"Yes, Eighth Prince, so, shall we fight?"

"Fight, why not?" Li Chengfeng said firmly.

Cheng Yaojin was taken aback for a moment, and said: "Okay, I understand, I'm going to call Datang's army here, and fight with the Tumeng dog thieves!"

After finishing speaking, Cheng Yaojin ran away.

But Li Chengfeng hurriedly stopped Cheng Yaojin, and said: "No, no, no, I didn't ask you to transfer our Tang's army, they stayed in ambush, and now is not the time for them to come out!"

"Then, there are no soldiers, how can we fight the army of the Sumeng?"

The more Cheng Yaojin spoke, the more anxious he became, he didn't even understand what Li Chengfeng was thinking.

What is the point of this, and ambushes?

If the ambush continues, Youzhou City will be breached.

But Li Chengfeng opened his mouth lightly, pointed to the row of troops on the left, and said: "Who said there is no army? Isn't my prince's 3000 Xuanjia army human?"

"However, there are only 3,000 people. Although they are all from the Xuanjia Army of the Tang Dynasty, how can 3,000 people stop the attack of the 800,000 Tubo army?"

Cheng Yaojin kept stomping his feet anxiously.

He thought Li Chengfeng was messing around~lightnovelpub.net~ Alas, if I knew it earlier, I shouldn't have let the Eighth Prince be the commander in chief, now it's all right, finally started messing around.

How could the 3,000 Xuanjia troops resist the 800,000 troops of the Sumeng? It's not even enough for people to serve in one pot.

"Hmph, I don't care, I'll go and dispatch troops, Eighth Prince, you can play here by yourself, the old minister won't accompany you anymore!"

After Cheng Yaojin bluffed, he was about to leave.

However, Li Chengfeng suddenly shouted angrily, "Presumptuous, Cheng Yaojin, don't you even listen to the commanding officer?"

"It's not that I don't listen, it's that I don't listen at all. If General Li Jing was here, he would definitely lead his troops to face the sudden alliance army! I am not only worried about your safety, Eighth Prince, but also us. The Youzhou City behind us, and the Tang Dynasty behind us all need our protection! Otherwise, the old minister cannot bear the crime!"

Cheng Yaojin started to quarrel with Li Chengfeng.

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