In fact, these black stones are a kind of magnet. As one of the four great inventions, they were made of natural magnets. They can be traced back to the Huangdi period. When Huangdi fought against Chiyou, he built a compass to identify the direction.

Many people think that the compass is just an ancient legend and is not worthy of acceptance, but Ma Jun built a compass to slap the ministers in the face of the questioning ministers. Even Emperor Ming Cao Rui admired it very much.

Ma Long's research on magnets has gone in another direction, which is the characteristic of magnets attracting iron. Mount Tai is rich in magnets. As a Dongping native, Ma Long naturally cares more about the specialties in his hometown than others. Ma Long is very fascinated by the characteristics that these magnets can attract iron, believing that if magnets are mined on a large scale and applied on the battlefield, it will definitely have a surprising effect.

However, in his early years, Ma Long's words were light and low, and his position was low. Although he had proposed this matter to the governor of the State, he was sarcastic when he got it. Ma Long had to give up. After all, with his financial resources, it was not enough to mine these magnets on a large scale.

Later, Ma Long's status in the Bingzhou Army rose. After the Bingzhou Army reached Chongzhou, Ma Long proposed this plan to Cao Liang. Unexpectedly, Cao Liang immediately agreed and allocated manpower and financial resources to support Ma Long to mine magnets. During this expedition to Liangzhou, Ma Long installed these black magnets on a flat box truck, hoping to have the opportunity to use it.

Magnets can absorb iron tools, especially when used on a large scale, and can form a magnet array. As long as iron weapons and equipment are used to enter the magnet array, they will be firmly sucked, thus losing their combat effectiveness.

However, the magnet only absorbs iron and does not attract other things. Therefore, while preparing the magnet, Ma Long also prepared a large number of bronze weapons: bronze swords, bronze spears, and bronze arrows. This way, when the magnet formation traps the enemy, it will not have any impact on the Wei army equipped with bronze weapons.

In fact, Ma Long was not the first to use magnets as a weapon. More than 400 years ago, when Qin Shihuang built the Afang Palace, he used magnets to build the Beique Gate. Any prickly palace with sharp blades that hid through this gate would be sucked into the gate and surrendered.

However, when applying magnets to the battlefield, Ma Long is the most deserving person. However, setting up a magnet array requires a special terrain. If it is a flat area, the enemy can completely walk around and make the magnet array lose its effect. Only by setting up a magnet array on the path that is necessary to pass through with narrow terrain can it achieve miraculous effects.

So after crossing the Yellow River westward, passing through Zhiyang, and after Lingju two battles, Ma Long had not sacrificed the magnet formation, and he was waiting for the right opportunity.

When he arrived at Wanhudui, Ma Long couldn't help but be overjoyed. Isn't this a natural place to set up a formation? So when the flat box truck could not be used, Ma Long still strided into Wanhudui with his head held high. Knowing that this might be a trap that the bald tree could have for him, Ma Long had another trick to deal with him.

After finding out that there was no ambush from the Xianbei people in Wanhudui, Ma Long immediately ordered to go to the camp and immediately enter the Wanjiaohudui Valley.

After entering the valley, Ma Long specially ordered the front lieutenant Ren Hai to lead 3,000 troops to go north to test whether the Xianbei people were ambushing.

Ma Long's order to Ren Hai was that once he encountered a Xianbei army, he did not have to fight with him, and he immediately retreated. On the way to retreat, he threw away all the weapons and armor of the front troops, and must be all, so that no one was left.

Ma Long's move was to let Ren Hai give equipment and weapons to the Xianbei people. Although the swords and guns used by the Xianbei people are made of iron, most of the Xianbei people do not have iron armor. Ma Long deliberately "given" some armor to the Xianbei people in order to make the magnet formation more efficient.

Of course, Ma Long's generous gifts were not free, and they needed to exchange their lives for the Xianbei people. When Xianbei soldiers wearing iron armor entered the magnet formation, they would be firmly absorbed. Even if they were not sucked from a distance, the huge magnetic field around them also made the weapons in their hands several times and their movements became slow. After killing these Xianbei soldiers, these weapons and armor naturally returned to the hands of the Wei army.

After sending Ren Hai, Ma Long immediately started to deploy the magnet formation. There were countless branch roads in Wanhudui Valley. If all of them were deployed, it was obvious that these magnets were far from enough, so Ma Long ordered the other forks to be blocked with a flat box truck, and only placed magnets on three or four main roads.

Everything was as Ma Long expected. As expected, the Tufashuoji set up a combat place to annihilate the Wei army. In order to lure the Wei army into Wanhuoji, the Tufashuoji evacuated all the troops and horses to the periphery of Wanhuoji. On the surface, Wanhuoji looked silent and deserted, but as long as the Wei army entered Wanhuoji, the Xianbei army would immediately kill Wanhuoji from all directions, and wiped out the Wei army in one fell swoop when the flat box truck could not form a formation.

But the bald tree has many calculations, but it did not count that Ma Long had another killer weapon. When the flat box truck could not be used, the magnet formation was laid out. This was an unprecedented battle formation. No famous generals of all dynasties had ever used it like this. As a Hu of the alien race, Bald Tree had no idea about the magnet formation. He sought the sword for merit. In order not to allow the Wei army to escape from Wanhudui, he asked all the Xianbei troops to enter Wanhudui as fast as possible, but he did not know that they stepped into a strange and strange space.

The Xianbei soldiers who had been complacent about snatching the armor now looked desperate. They were attracted to the ground or on the roadside by magnets and could not move at all. They could only watch the Wei soldiers holding swords and guns rushed over, harvesting their lives like harvesting leeks.

At this time, the Xianbei soldiers were like fish on chopping boards, and were slaughtered but powerless. They wailed in despair and begged for mercy, but the Wei soldiers were not ruthless and took their swords down and cut off the heads one by one.

Now there are many soldiers in Xianbei, and the Wei army has no time to surrender and rebel. Moreover, the secret of the Magnetic Formation cannot be known to the Xianbei people. Only dead people can keep the secret. Therefore, the Wei army killed the Xianbei soldiers trapped in the Magnetic Formation and did not leave any survivors.

The Xianbei army was still crowded. Although they knew that the Xianbei army ahead suffered heavy casualties, no one would know how it died. The Wei army cut wave after wave, and blood stained the valley with thousands of hupus.
Chapter completed!