When the Vertical Arch Hall issued the edict on the transfer of troops, Zhao Hongrun was designing drawings for improving arrows in the room where the Smelting Bureau was on official business.

To be precise, it is a drawing that improves the arrowhead.

The so-called arrowhead is an arrow made of metal.

The arrowhead used by the Wei army is commonly known as the "two-winged arrowhead".

The double-wing arrowhead is divided into a solid round collar type and a hollow chisel type.

The solid round collar type is to insert the arrow shaft into the hollow arrow shaft for fixing; The hollow chisel type is to insert the arrow shaft directly into the hole at the tail of the arrow for fixation.

The characteristics of this arrow are that the arrow is flattened, slightly curved, and the blades of the two wings have a few barbs, so that the person who is hit by the arrow will suffer a second pain when pulling out the arrow, which is already a relatively lethal arrow.

It is no exaggeration to say that the arrowheads used by the Central Plains countries are all this kind of double-winged arrowheads, and their penetrating power is stronger than the original arrowheads.

But unfortunately, the development of the two-wing arrowhead has reached the peak at this point, and there is no possibility of improvement.

Therefore, Zhao Hongrun decided to abandon this "two-winged arrowhead" and chose its evolutionary type, that is, the "three-edged arrowhead", as the standard arrow arrow of the Wei army.

In fact, to be precise, the evolution of the two-winged arrowhead is the "three-winged arrowhead", and the "three-edged arrowhead" is the product obtained by improving it again on the basis of the "three-winged arrowhead".

The difference between the two is that the "three-winged arrowhead" only adds one wing (one blade) compared to the "double-winged arrowhead", and the blade is still flat, and after this arrow is shot into the human body, the human wound will naturally fit the blade, so as long as it does not hit the vital part, it will not be fatal in a short time.

The "three-edged arrowhead", which is improved on the basis of the "three-winged arrowhead", has a cross-section of an inward-concave triangle.

Don't underestimate this concave triangle. In fact, this small change is the culmination of decades or even hundreds of years of wisdom from ancient craftsmen. And it is the prototype of the oldest bloodletting trough. "Note: Why are the arrows of the Qin State strong in real history, look here."

This concave triangular surface, or phlebotomy trough. After the arrow hits the human body, it will open the opening because of the expansion of the three-edged arrow, so that the blood in the human body will spurt out along the concave triangular surface, and the purpose of causing a large amount of blood loss to the person who is hit by the arrow will be achieved in a very short time.

What's worse is that this kind of arrow can't be easily pulled out of the human body because of the barb relationship, which makes the soldiers on the battlefield almost declared dead once they are shot by this kind of arrow.

It has to be said that the birth of the three-edged arrow is a major milestone in the history of the arrowhead. Its appearance almost ended the possibility of some powerful generals who could "carry dozens of arrows without dying", making arrows once again the biggest killing weapon on the battlefield.

In front of this kind of "three-edged arrow", even a military general with a full physique, qi and blood is difficult to support a few arrows, unless the other party quickly pulls out the arrows and binds the wound. After a few moments, he will face a state of suspended animation due to massive blood loss, followed by a lethargic state of true death.

And the work that Zhao Hongrun is doing right now. It is to further strengthen the bloodletting function of the "three-edged arrowhead" in order to achieve the goal of "making people lose their ability to fight with one arrow".

This is not an easy task, after all, in order to enhance the bloodletting function of the Triangular Arrowhead, it is necessary to expand the blade and enlarge the bloodletting groove, and doing so will undoubtedly increase the weight of the arrowhead. The balance between the arrowhead, the shaft, and the feather of the arrow is broken.

Once the balance is broken, the arrow is scrapped, because it has no effect on the battlefield at all, either the range is greatly limited, or the accuracy is greatly reduced.

It's a project that requires trial and error.

"Someone!"

Zhao Hongrun shouted inside the house.

At this time in the outhouse. There were several clerks from the Smelting Bureau, who were responsible for the work of standardizing the new weapons proposed by Zhao Hongrun, and to put it bluntly, they were drawing more accurate drawings of the draft design that Zhao Hongrun had drawn casually, and filling in various length, width and height values.

The precise drawings drawn by these scribes will eventually be sent to the workshops of the Smelting Bureau and officially put into production.

After hearing Zhao Hongrun's call, a scribe immediately put down his work, walked into the inner room, came to Zhao Hongrun's table, bowed down and bowed: "What does King Su command?" ”

I saw Zhao Hongrun hand the sketch of the "three-edged arrowhead" in his hand to the scribe, and said, "Ask the workshop to create a batch as soon as possible and test the effect." ”

The scribe took the sketch with great interest.

He couldn't help but be a little excited, after all, in his opinion, this His Royal Highness King Su in front of him would always come up with something very powerful from time to time, which made the whole smelting bureau look forward to what His Royal Highness King Su proposed more and more.

"What is this Highness doing today? I'll take a look......

The scribe took the sketch and studied it carefully for a while, simulating the lethality of this three-edged arrow in his mind, but because of the limitation of his knowledge, he could not really appreciate the terrifying lethality of this three-edged arrow, and only vaguely felt that this was a very terrible arrow.

The scribe returned to the outhouse, and when he saw his colleagues looking with their heads open, he secretly showed his sketches to his colleagues, which caused a burst of exclamations from the scribes.

After all, those who can sit here and give help to His Royal Highness King Su Zhao Hongrun are all people with active brains, so how can they not imagine the horror of this kind of arrow on the sketch compared to the drawings.

Hearing an obviously suppressible exclamation from the outhouse, Zhao Hongrun picked up the teacup on the side and took a sip of tea to moisten his throat.

He has no doubt that this kind of "three-edged arrowhead" will once again improve the status of the bow and crossbow on the battlefield, after all, in Zhao Hongrun's view, this should be the most advanced arrow arrow at present, almost the peak of the history of the arrow arrow, if you want to improve it in the future, then you can only start from the texture of the arrow, that is, replace the metal used to make the arrowhead, and use a sharper and stronger metal, such as steel.

It is undeniable that this will be a big hole card for Wei in the future, but there is also trouble, that is, Zhao Hongrun must protect this kind of arrowhead, so that they do not flow into the hands of Chu, Korea, and Qi and other Central Plains countries, especially Lu.

You must know that the craftsmen in this world are simply cheating in Zhao Hongrun's eyes. It is no exaggeration to say that as long as the craftsmen of other countries are given a few of these triangular arrowheads, unless their heads are suddenly amused and foolishly think that this kind of arrowhead is useless, they will create a new three-edged arrowhead according to the few triangular arrowheads they have acquired. It's not a hard thing to do.

No, the crossbow box of the Lu State that was given up by Zhao Hongrun a while ago, the young craftsman named Ding Jun thought of the gear technology from the Lu State from the gear traces in the box, and Zhao Hongrun was stunned to restore the machine crossbow box.

It's a pity that after trying it, I realized that the rate of fire of this machine crossbow box is simply slow, and it is not at all like what Cheng Wangfu of the Smelting Bureau said, according to Zhao Hongrun's private estimates. It was about six or seven seconds to shoot a machine crossbow, and the range and strength were not as good as the repeater that Zhao Hongrun knew in his mind.

What's worse is that once the switch is turned on and the crossbow box enters the shooting stage, it cannot be stopped unless the crossbow bolts in the box are fired, and once it is forcibly stopped, it will be "stuck" and the gear system in the box will be damaged.

Thereupon. This crossbow box of the Lu State was finally given up by the disappointed Zhao Hongrun. He subjectively felt that the craftsmanship of this era should not have reached the point of automatic shooting and automatic loading of arrows.

Of course, it is also possible that this crossbow box is just a "trial model" developed by Lu Guo, and now, Lu Guo may have developed a more advanced machine crossbow box. But Zhao Hongrun didn't think that Lu would easily send this kind of weapon abroad, so he died and concentrated on tinkering with his repeater.

After all, the crossbow is also a weapon that can change the way of warfare.

All in all, Ding Jun, a craftsman of the Wei State. Zhao Hongrun has experienced what is called the ability to imitate, therefore, once these triangular arrowheads flow into other countries, it is very likely that they will be imitated by other countries in a short period of time, so Zhao Hongrun decided to add a clause in the military regulations when issuing these arrows: When cleaning the battlefield, the triangular arrowheads must be recovered as much as possible.

Although this does not prevent the process of triangular arrowheads from flowing abroad, it can at least hide it for a while, so that the Wei army can take the "lead" during this time.

During the period when the Smelting Bureau was developing and experimenting with the three-edged arrowhead, Zhao Hongrun went to the palace and asked to see his father.

This is the first time that Zhao Hongrun took the initiative to go to the Vertical Arch Hall after the father and son had a conflict because of Miss Su.

In the vertical arch hall, Zhao Hongrun told his father the purpose of this visit: please transfer the Yanling army and the Shang water army.

Wei Tianzi was very pleased and moved by the son who was attacked by the big thief Huan Hu at night when he was in the camp of the Wei people during the hunting in Chenggao.

Well, forget the gifts of the two rabbits, Wei Tianzi gave them to Shen Shufei, and asked the two rabbits to be Shen Shufei's company.

"Hongrun, you mean, summon the Yanling Army and the Shangshui Army?"

In all fairness, Wei Tianzi was not worried about the loyalty of the two Chu armies, the Yan Ling Army and the Shang Shui Army, after all, if these people dared to rebel, neither Wei nor Chu would be able to accommodate them.

The problem is that the commander of this war against the Dangshan people is Sima An, the general of the Dangshan Army, and Wei Tianzi knows this former Zongwei very well, and knows very well that he is most disgusted by foreigners.

Let him fight with a surrendered army of Chu against the Qian?

Wei Tianzi could guess what would happen just by thinking about it.

"Erchen thinks so, before the Sixth Emperor Brother rushed to Qi State, he repeatedly told Erchen to tell Erchen to stare at the Nangong in Song Land. In the past, it was the Dangshan Army that was guarding the Suiyang Army in Nangong, and now the Dangshan Army is going to Sanchuan, therefore, Erchen wants the Yanling Army to temporarily replace the defense of the Dangshan Army, and as for the Shangshui Army, Erchen also wants to mobilize a part of it to assist General Sima An, but in the end, the strength of the Dangshan Army is still a little weak......"

Zhao Hongrun said a lot of things, only to hear Wei Tianzi roll his eyes.

"Alright, alright." Wei Tianzi waved his hand to interrupt Zhao Hongrun's statement, and asked angrily, "What do you want?" ”

"Erchen implores his father to appoint his son-in-law as the 'supervising army' during the expedition against the Qian, so as to prevent General Sima An from indiscriminately killing innocents." In order to protect the tribes of the Qingyang tribe and the Baiyang tribe who were quite close to the Wei State, Zhao Hongrun pleaded.

Hearing this, Wei Tianzi's face flashed with a strange look.

"You? Want to restrain Sima An? ”

"No, it's assistance." Zhao Hongrun corrected. (To be continued.) )