Before the fourth update, Cao's army had all mobilized. Nearly 25,000 Cao's soldiers stood with nearly ten miles long walls. Everyone was holding bows and crossbows, looking nervously at the wilderness around the barracks. The defense arranged by Zhao Yan was like a wall of iron. No matter which direction the Jiangxia army attacked, they would be subjected to fierce counterattacks from Cao's soldiers.

In fact, it was not easy for the Jiangxia army to capture the military camp. Not to mention the large number of Cao soldiers, even the military camp itself was very ordinary. The walls were 10,5 feet high, and 800 bed crossbows were deployed, with a range of 300 steps.

The military camp is surrounded by a Huying River that is ten feet wide. There are also a large number of horse pits in the wilderness outside the Huying River. Sharp bamboo sticks are inserted into the pit. Whether it is a man or a horse, they will be seriously injured once they miss the air.

Zhao Yan's defensive skills were fully demonstrated in this military camp. Even when Cao Cao came to inspect, he praised the military camp for its strict defense structure and its iron walls. It also had food for one month and sufficient well water. This was true. Zhao Yan was very confident. He was not worried about the attack of the Jiangxia army, but made arrangements calmly.

On the wall, Sima Yi looked at the burning fire hundreds of steps away from the city with a complicated expression. After a long time, he sighed softly.

"Why is the chief clerk so melancholy?" someone asked behind him with a smile.

Sima Yi turned around and saw that it was Yu Jin. He shook his head and smiled bitterly, "If I come to attack this military camp, I can take it down without dawn."

"How can Zhao Hu's military situation be felt by the chief clerk? He is ready to hold on for a month. Isn't this called "iron wall"?" Yu Jin smiled with a teasing tone.

"Although Zhao Yan is not willing to die, does General Yu not consider his subordinates?"

Yu Jin's face was solemn and his smile was gone. He bowed and bowed, "I wish to listen to the chief clerk's words."

"General Yu has experienced many battles. He should know that this kind of iron wall is actually full of loopholes, especially when turmeric oil is used in wars, but Zhao Hujun is still using old habits to defend."

Speaking of this, Sima Yi pointed to the county town more than 200 steps away: "The military camp is 250 steps away from the county town. Although it can be defended against the shooting of bows and arrows, if the Jiangxia army uses a large catapult with a range of 400 steps and attacks from the county town from a high point, how can we stop it? The Jiangxia army only attacks the county town but not the camp, obviously it has discovered this defense loophole."

Yu Jin's face changed drastically, Sima Yi's reminder made him think of tinea oil. He said nervously: "If Jiang Xia army poured back all the more than 6,000 barrels of tinea oil seized, the entire camp would be burned to white ground!"

"General Yu is right. Zhao Yan obviously did not consider the turmeric oil. He only considered how to shift the responsibility to me." Sima Yi sighed, feeling infinitely melancholy.

Yu Jin didn't have time to consider Sima Yi's delicate thoughts. He only cared about the safety of himself and his subordinates, and asked quickly: "The chief clerk thinks how can we escape this disaster?"

"In fact, when the police are heard from Yunyang County, we should take the initiative to attack. Thirty thousand people gave up the camp and took the initiative to attack. Perhaps there is still 30% chance of victory, but Zhao Yan's conservatism has led us to miss the fighter's chances many times. Now there is only one word, and we may still have a glimmer of hope."

Yu Jin hesitated and asked, "Is the chief clerk talking about escape?"

"Whether you escape or withdraw, as long as you leave the military camp in time, even if you encounter interception and attack from the Jiangxia army, we can still save 70% of our troops. If you insist on defending the military camp alone, you may not even have a chance to escape."

"I'll go find Zhao Hujun!"

Yu Jin turned around and was about to leave, but Sima Yi stared at the distant city wall and said, "I'm afraid it's a bit late!"

Yu Jin turned around and looked at the city wall more than 200 steps away from the distance. At this time, a little moonlight had already emerged from the clouds, making the field of vision a little farther away. You could vaguely see many huge figures on the top of the city, more than two feet high, just like giant beasts standing on the top of the city.

Yu Jin changed his color in shock, turned around and ran into the camp.

Sima Yi's guess was not wrong. At this time, the craftsmen were quickly installing huge trenchers on the city. This winch-type heavy trencher was designed and developed by Ma Jun. It was 18 feet tall and the boom was three and six feet long. There was also a winch-shaped iron weighing a thousand kilograms.

First, hang the chain hook on the winch sinker iron on the arm rod, then push the winch and twist the belt to form huge potential energy on the arm rod. As long as the mechanism is pulled, the chain hook will break away from the arm rod and the arm rod will swing out suddenly.

A heavy catapult can operate in just twelve people, which is 80% less than the original fifty people. It also effectively avoids the damage caused by abnormal synchronization when human pulls. Its range can reach more than 400 steps, exerting the power of the heavy catapult to the extreme.

Liu Jing looked down at the camp not far away from the front of the city, with a smile on his lips. Jia Xu's analysis was correct. Zhao Yan's conservative style made him miss the opportunity to evacuate the camp, and he would definitely pay a heavy price for it.

Can Sima Yi change Zhao Yan's decision? Liu Jing also felt it was unlikely. Even if Zhao Yan realized the danger, he would never follow Sima Yi's advice to withdraw his troops. This was Cao Cao's improper employment of people, and he shouldn't have used civil servants to lead troops at all.

At this time, a soldier rushed to report: "The governor of Qibingzhou has been prepared and can be launched at any time."

Liu Jing nodded and resolutely issued an attack order, "You can launch!"

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There was chaos in Cao's camp, and thousands of Cao's soldiers were urgently withdrawing the camp tents. Once Jiangxia's arms attacked the camp, these big tents would turn the camp into a sea of ​​fire. As the camp tent disappeared, open spaces were exposed.

In the central army tent, Zhao Yan paced back and forth with his hands behind his back. The situation in front of him made him extremely worried, but he could not make up his mind to retreat immediately.

On the other side of the tent, Yu Jin and Zang Ba were anxiously waiting for Zhao Yan's decision. They were both generals who had experienced many battles. Like Sima Yi, they both realized the dangers facing the camp and strongly advocated evacuation.

But Zhao Yan was the main general. Without Zhao Yan's consent, their army could not leave the camp, otherwise they would seriously violate military rules and even beheaded by Cao Cao.

"The head coach, you can't hesitate anymore. You must retreat immediately, otherwise we will all encounter a catastrophe. The head coach, please withdraw!" Yu Jin advised anxiously.

"Master, please withdraw!" Zang Ba also said anxiously: "It will be too late if you don't withdraw."

Zhao Yan sighed, "Do you think evacuation can be safe? The Jiangxia army has hundreds of warships, at least tens of thousands of troops, and more than two thousand cavalry. Wherever the army is gone, aren't we just waiting for us outside? We don't have the ability to fight night, and even if we evacuate, we will still be unable to escape the fate of being completely wiped out. Staying here will at least not collapse, and it will be an army."

Yu Jin became anxious and shouted loudly: "But if we don't evacuate, we will all burn to death!"

Zhao Yan glared at his eyes and said angrily, "General Yu, are you talking to the chief general? No matter how rude you are, if you dare to be rude, I will kill you immediately with military rules!"

Yu Jin did not dare to say anything more, lowered his head with hatred, and Zang Ba next to him said: "Master, staying here is not a solution. We have no catapult and cannot resist the opponent. We are backfired by more than 6,000 barrels of turmeric oil. Staying here is indeed dangerous. Please think twice."

"I know!"

Zhao Yan replied coldly, and he walked to the big tent, stared at the night sky, and said for a long time: "The fifth day has passed, and it will be dawn in another hour. Please retreat after dawn! This is the safe way."

Yu Jin and Zang Ba wanted to persuade them again, but Zhao Yan waved his hand to interrupt them, "I have weighed the pros and cons, and I decided like this, you guys go!"

Yu Jin and Zang Ba walked out of the tent, and Yu Jin said harshly, "A nerd, how could the Prime Minister let such a person be the chief general?

"Shh!"

Zang Ba quickly glanced behind him and whispered: "Prepare for the future. Let's consider a retreat by ourselves. If the situation is not good, you don't have to die with him."

Yu Jin was overjoyed. He was so surprised that he thought, but he was afraid of being severely punished by the Prime Minister. Now that there was one more Zang Ba, it was not his own problem. He was about to agree, but at this moment, a shout came from the east. Yu Jin and Zang Ba turned their heads and looked at them, and were shocked. In the sky of Dongdaying, four or five huge fireballs were roaring towards their heads, as if meteors were passing through the night sky.

In addition to the fireballs, seven or eight barrels of tiny oil were mixed in the air and thrown to the camp at the same time. The tiny oil hit the ground, and the wooden barrel immediately shattered, and the tiny oil overflowed and filled the ground. A tiny oil roared and lit the tiny oil on the ground, and the raging fire immediately burned.

The Cao army camp was in chaos, and the huge fireball made everyone feel extremely shocked, and there was a panic like entering the doomsday.

The fireball is made of rice stalks and is soaked with tincture oil. This kind of fireball is a powerful tool for rushing to the camp. After it lands, it will roll with huge inertia and can rush out more than a thousand steps. If it falls into the camp, it will pass by a sea of ​​fire.

Zhao Yan rushed out of the tent and shouted: "Buried with sand and soil!"

Zhao Yan was valued by Cao Cao, and he was indeed a little capable. He was just worried about being attacked on the road and refused to evacuate at night.

But he also thought of the danger of Jiangxia's armed attack, so he arranged countermeasures. In addition to collecting all the camp tents, he also ordered the soldiers to prepare a large amount of sand and soil. Once turbulent oil hit the camp, he would immediately bury it with sand.

It was just that the fireball caused panic among the soldiers, and the military camp was in chaos. No one thought of burying the tincture oil with mud and sand. At this time, more than a dozen places were on fire in the camp, and fireworks filled the Cao camp.

But at this time, some soldiers of Cao's army had already begun to respond urgently. He was waiting in the camp with the sandbag. Once the tincture oil fell, he immediately covered the overflowing tincture oil with sand and soil, and the effect gradually appeared.

Although the fireballs and oil barrels in the sky were still roaring and smashing one after another, the fire points in the camp were decreasing everywhere, and Cao's army had already controlled the turbulent attack of Jiangxia army.

However, another greater crisis in Cao's army happened later. Zhao Yan never dreamed that he would dig a well and get trapped in himself.

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Chapter completed!