After some inquiry, Zhao Yun was pleasantly surprised to find that the surviving people were actually the craftsmen responsible for upgrading these thunderbolts, and their arrival was originally to instruct Cao Zhang on how to use the thunderbolts correctly in order to maximize his abilities or accurately hit the target.

This discovery is undoubtedly of great help to Zhao Yun's sergeants who have never used such siege equipment, Zhao Yun knows that although they have successfully blocked Cao Zhang's sergeants who want to return to Sima Yi's camp at this time, Cao Zhang, who has fled back to Weixing County, will not give up, he will definitely find a way to detour to inform Sima Yi of the news, and once Sima Yi learns the news of Zhao Yun and the others, this matter will not be easy to do.

Therefore, Zhao Yun and Zhou Yu did not delay any time, long before coming here to set up an ambush, they had already planned the whole process of this matter, and after the matter was over, they did not have any further discussion, some sergeants directly took off the clothes and armor of those Wei soldiers who died in battle, and quickly changed them to their own bodies, but they wrapped a piece of white silk that had been prepared long ago around their arms, obviously for distinguishing purposes.

After doing this, the Jingzhou soldiers who changed into the black armor of the Wei army carried all the ropes that transported the thunderbolt cart on their shoulders, just like Cao Zhang led the 10,000 horses before, and continued to walk towards Sima Yi's camp, while those Jingzhou soldiers who did not change into the clothes and armor of the Wei army were under the leadership of Ma Chao, and followed the place one or two miles away from the previous sergeant to hide people's eyes and ears.

The reason why Zhou Yu chose to do this, instead of directly leading the army to carry those sharp thunderbolts to attack Sima Yi's camp, was because that would definitely be discovered by Sima Yi when he approached the camp, so Zhou Yu chose such a strategy that seemed to be a bit risky, but once successful, he could gain more results.

More than 20 miles away, not long has already walked most of the way, less than ten miles away from Sima Yi's camp, a group of Wei army scouts appeared in front of their eyes, when those scouts saw that it was the Wei army soldiers transporting thunderbolt cars, just wanted to go back to inform Sima Yi, but was summoned to the front by Zhao Yun, who pretended to be the general of the Wei army, of course, waiting for them was inexplicably captured......

In this way, Zhou Yu and Zhao Yun led thousands of soldiers pretending to be Wei soldiers to continue to advance towards Sima Yi's camp until Sima Yi's camp clearly appeared in their field of vision.

This time is not much different from the time agreed between Cao Zhang and Sima Yi before, after Sima Yi got the reward of his subordinates, he naturally did not doubt him, he looked at the distance and slowly moved to his camp It was the improved thunderbolt that he had already prepared, and the handsome flag waving in the wind was also Cao Zhang's handsome flag, nothing was abnormal, but Sima Yi did not think about it carefully, whether it was really necessary for Cao Zhang to put the nine thunderbolts at the front of the team.

Gradually, Sima Yi's camp was getting closer and closer to Zhao Yun, and as he had learned from the Wei captives, there were at least fifty or sixty thousand Wei troops resting in the camp at this time, in order to replace the Wei army that was besieging the city at this time in the next period.

At this time, Sima Yi had already arrived outside the big tent, he knew that with Cao Zhang's temperament, he would definitely transport this thunderbolt car directly outside his big tent, and he also wanted his soldiers to take a closer look at these war machines, and then witness with their own eyes how they destroyed the city of Shangyong under the long-term siege overnight.

But what Sima Yi didn't know was that hidden in the stone throwing bags behind the thunderbolt cart, huge round stones were ready, and when they could attack the place where the soldiers in Sima Yi's camp were most concentrated, Zhao Yun would give an order.

The projection distance of this improved thunderbolt was about half a mile, and soon, Zhao Yun and Zhou Yu led the army to this distance.

At this time, there is only one day left before the five-day period agreed by Liu Feng and his soldiers, and the defenders have lost more than half of the city defense battle that is almost overdrawn by their physical strength, and there are only more than 20,000 people left who can fight, but Liu Feng's face is still resolute and cold, in his eyes, there is no trace of worry, let alone a trace of despair, as if he is experiencing an ordinary battle.

According to the situation at this time, after a day, the defenders may not be able to hold out for a few more hours, Pang Tong looked at the situation on the city wall and the number of siege Wei troops who did not seem to have decreased much, it was a little difficult to hide the worry on his face, he went to Liu Cover several times and wanted to speak, but he couldn't say it.

Indeed, according to the agreement between Liu Feng and Li Chuang, the last day was just in case, and within four days, he should bring the army of Wancheng to the outside of Shangyong City, and calculate the time, probably within these hours, Liu Feng knew in his heart that if the Wei army attacking the city did not move in half a day, he was afraid that he would really start to discuss the matter of retreating, after all, it was not necessary for him to break the cauldron in Shangyong.

The variable that Liu Feng didn't know was that Zhou Yu also followed Li Chuang, and what he didn't know was that Sima Yi prepared a thunderbolt, but now it fell into Zhou Yu's hands.

Speaking of which, Sima Yi at this time was watching the thunderbolt slowly coming in his direction, and he couldn't help but look forward to the scene of breaking the gate of Shangyong with these combat weapons, as long as he could quickly break through the gate of Shangyong, then it would be possible to capture Liu Fengsheng, who had not yet reacted.

However, just as he was thinking about this, the thunderbolt suddenly stopped when it was half a mile away from him and the Wei soldiers behind him, which made Sima Yi's heart move, and he didn't know why Cao Zhang didn't put the thunderbolt nearby.

I saw that after those thunderbolts stopped in place, Cao Zhang did not appear as Sima Yi imagined, but several Wei soldiers quickly climbed onto the thunderbolts, seeing this, Sima Yi frowned, but he still did not think about the most dangerous place in his heart.

It wasn't until after a while that there was a unique 'crackling' sound of a thunderbolt in front of them, followed by huge round stones, which quickly attacked the Wei army who were resting in place, and people didn't have time to react at all.

"Not good! Enemy attack, quickly retreat! ”

Seeing this situation, how could Sima Yi not know what had happened to him, and hurriedly gave an order in the middle of the formation, but obviously, the retreat speed of the unprepared sergeants was definitely not able to catch up with the flying stones.