Under the leadership of Cao Cao's general Liu Ye, the Yuan Shao's allies began to build the thunder chariot in secret, digging holes and guarding, but in fact they were always within Yang Rui's vision.

Although the level of the Elf Secret Ninja soldiers of Yusu Jianbing Guard is not too high, they do have unique features in reconnaissance. Just when Yuan Shao's Allied troops were digging the tunnel, the Elf Secret Ninja had already discovered its abnormal movement.

However, Yuan Shao's Allied Army was very strict in the care of the Eagle Secret Ninja, and the Eagle Secret Ninja was unable to find out the specific situation immediately. After all, the Eagle Secret Ninja is only a level 4 and a level 5 soldier. Even if the escape technique is very good, with the attention of the Yuan Shao's Allied Generals, there is level suppression and he cannot fully exert his strength.

Of course, Yang Rui did not only have the Eagle Secret Ninja. When the Eagle Secret Ninja discovered an abnormality and told Yang Rui the relevant situation through the Yusu Contingent Guard, the air force of the flying pet was sent out continuously, and he was always monitoring the situation of Yuan Shao's allies digging the tunnel.

At first, Yang Rui could not judge Yuan Shao and his allies' intentions. Since many of Yuan Shao's troops were good at tunnel warfare, Yang Rui even considered whether Yuan Shao wanted to take similar measures at this time.

However, after thinking about it, Yang Rui quickly denied that Yuan Shao's allies were on the north bank of the Yellow River, and there was a Yellow River condemnation in the middle. Even if the Yellow River is frozen, the river water still flows under the ice.

In any case, it is very difficult for Yuan Shao to dig an authentic tunnel to the south bank. Even in reality, with the help of modern technology, it is very difficult to build a tunnel across rivers or seas, not to mention in the background of the game.

Therefore, this possibility was quickly eliminated by Yang Rui, and Yuan Shao's allies' actions of digging caves seemed even more elusive.

Of course, Yang Rui would not let it go easily when he knew about this. Moreover, Yang Rui also had an investigation method that was not useful, that is, Yusu Jianbingwei himself.

When neither the Ethereal Secret Ninja nor the flying pets could detect the purpose of Yuan Shao's Allied Army members digging, Yusu Jianwei diverted his attention with the harassment of several waves of flying pets and successfully escaped into the tunnel excavated by Yuan Shao's Allied Army members.

It was obvious at a glance that the tunnels of Yuan Shao's Allied Army were filled with materials for making pili vehicles, and some of them were under construction, and even a few of them had been initially formed. Just by observing, you can know that it is a powerful siege equipment.

In terms of appearance, the Pili chariot is a heavy-duty stone-cat siege equipment, which looks very spectacular in shape, and is similar to the heavy-duty stone-cat siege obtained from other civilized areas in Yang Rui.

Yusu Jianwei had seen heavy trench machines, so when he saw the prototype of the Thunderbolt chariot, he immediately guessed the use of these props.

After that, the Yusu Investigation Guard almost turned the tunnels that were more than ten miles long, carefully looked at the situation inside, and then found a gap and took the opportunity to leave the tunnel dug by Yuan Shao's Allied Army.

There were a large number of Yuan Shao's Allied generals and troops guarding the tunnel, but in comparison it was much easier than lurking in. At the same time, the skills of Yusu's Investigation Guard were not covered. If it weren't for the coverage of the Emperor's Thunder, Yang Rui would have difficulty finding him out.

With the assistance of powerful concealment skills and escape skills, Yusu Jianwei successfully broke away from the Yuan Shao Allied tunnel and met with the flying pets at the scheduled location, bringing back the observed situation in the tunnel.

At this point, Yang Rui naturally grasped the general intention of Yuan Shao's Allied Army, and Yang Rui further guessed that the siege equipment that Yuan Shao's Allied Army was building should be the Thunderbolt Vehicle. This is not difficult to guess based on historical facts and the records of the Battle of Guandu in the Romance.

Yang Rui had 100 heavy trenchers and had known the power of such siege equipment for a long time. According to the situation described by Yusu Jianwei, the Thunderbolt chariot under construction by Yuan Shao's Allied Army should not be slightly weaker than the heavy trencher.

If the Yuan Shao's allies really had to build the Pili chariot and put it into the next step of siege, the defensive pressure Yang Rui had to face would be very huge, causing losses would inevitably lead to reverse the war situation.

Most importantly, it seems that the number of Yuan Shao's Allied troops is building Pili vehicles, at least it can be compared with the number of heavy trenchers in Yang Rui's hand, and even more.

Yang Rui naturally would not sit and watch this happen. Yang Rui quickly took countermeasures and actions to address the fact that Yuan Shao's Allied Army was carrying out the construction of the Pili chariot.

Since all the materials and the entire process of the Pili Vehicle were in the tunnel, it was not easy for Yang Rui to directly attack it, so he could only take a roundabout solution.

On the night when Yang Rui got the information on the construction of the thunder chariot, Yusu Jianbingwei was sent by the flying pet to the vicinity of the Yuan Shao Allied Army on the north bank of the Yellow River. At this time, a large number of ethereal secret ninja soldiers north of the Yellow River had been summoned, with about 5,000 people.

In addition, there are more than so many Ethereal Secret Ninjas north of the Yellow River. Most of the remaining Ethereal Secret Ninjas are staying at the fourth level. Once they encounter conflicts, it is not easy to escape without any trouble. Therefore, Yang Rui temporarily retains this Ethereal Secret Ninjas, so that he will not participate in the action for the time being, and also retains the power for the next step of exploration.

The first thing that took action was not the Yusu Kantou and his soldiers of the Ethereal Secret Ninja Division, but were still a large number of flying pets. After nightfall, the flying pet divisions were dispatched collectively and dropped waves of "air bombs" at the Yuan Shao's Allied Camp.

Balls of fireballs cut through the night sky and flew to the camps of various troops of Yuan Shao's Allied forces. Even though Yuan Shao's Allied forces had already prepared for preventing air raids and tried to distribute the camps as much as possible, some losses were inevitable.

A large number of camp tents were ignited. Even if the fire did not spread, some soldiers would not burn or even be hit by fireballs.

Just when there was chaos and bustle in front of him, Yusu Jianbingwei commanded the soldiers of the Eagle Secret Ninja team to rush into the tunnel where the Thunderbolt chariot was built in the rear.
Chapter completed!