The entrance to the underground secret room was in one of the rooms, and when Liu Yuan entered, the imperial guard in charge of guarding inside also carefully searched Liu Yuan's body and confirmed that he was not carrying weapons, and then opened the entrance and let Liu Yuan and Tang Jin enter.

As soon as the entrance opened, Liu Yuan looked at the steps one by one, slowly extending to the ground, and at the corner of the place, an oil lamp was lit for lighting, and the steps were also loose when four people went down together, and sure enough, it was the royal handiwork, Liu Yuan thought that he was going to drill a hole like a mouse.

Go all the way down, only to see that the passage has oil lamp lighting, do not need to carry lanterns to illuminate, this hole is dug very well, not only the construction is meticulous, the air is not suffocated, there should be a vent, its professionalism Liu Yuan is also secretly surprised, but think about it, this is not unexpected, in the Three Kingdoms period, those ancestors have already dug the hole of Tibetan soldiers, a dig is to hide the hole of 100,000 elite soldiers, it can be seen that the smart and hard-working Chinese people, not only love the land under their feet, but also good at benefiting the land under their feet.

Liu Yuan, under the leadership of Tang Jin, turned two corners, and entered a spacious secret room after the last one, this secret room is not very large, about fifty square meters, and there are torches inserted in the cave wall, illuminating this secret room as bright as day, in this secret room, Li Er and Changsun Wuji are swinging something, and Li Er's four personal guards are also standing on the side expressionlessly.

Before entering this secret room, Liu Yuan smelled a familiar smell of sulfur, which is the smell of gunpowder after burning, and when he went in, he saw Li Er and the eldest grandson Wuji, who were fiddling with something like an iron rod, which was probably the prototype of the "gun".

Relatives are pro-power, no matter what Li Er does, he doesn't hide from Changsun Wuji, like Cheng Lao Demon King, Qin Qiong and others, he doesn't bring any of them, but he brings Changsun Wuji, a Wenchen, and his trust is still valued, which can be seen, and in fact, Changsun Wuji is indeed very capable.

"Weichen see the emperor." Liu Yuan honestly practiced etiquette.

"The little one meets the emperor." On the side, Tang Jin hurriedly saluted. Then the fat face is almost on the ground, it is really a bit like the feeling of five bodies throwing to the ground.

Li Er nodded and said, "Okay, excuse me, you all get up and speak." ”

"General Liu has worked hard, and when he was still at breakfast, he was called by the emperor, are you still hungry? Or. Someone bring in some snacks? The eldest grandson Wuji suddenly said with a mocking face.

Liu Yuan was taken aback, and hurriedly asked, "Eldest Sun Taiwei is really a god, what's wrong with you?" ”

As soon as Huang Gonggong left, he rushed here immediately, even if he didn't report the news so quickly, how did this eldest grandson Wuji know about Lu Dao? Can it be pinched or not?

The eldest grandson Wuji walked in front of Liu Yuan. Reaching out and pinching it on the collar, he took out a piece of broken bread, and said with a smile, "Look, there's still there." ”

Liu Yuan was embarrassed all of a sudden, he was in a hurry to go out, he didn't pay attention for a while, and the little lady didn't find out when she was worried. The dignified general, it's better to have breakfast than a child, and it is really a joke when it is rumored that it is rumored, or he is ugly in front of Li Er, and he is embarrassed to his grandmother's house.

"That, I didn't pay attention to it for a while, but it made the captain laugh." Liu Yuan said as he hurriedly sorted out his clothes. I'm afraid that there will be anything left, this eldest grandson Wuji, is really like fine hair, and such a small bit of Hu Biscuit can also be found, and the vision is really good.

For some reason, Liu Yuan suddenly remembered the words "Eyes are like torches", and he couldn't help but compare him with Uncle Liu Huang, whom he admired the most. When Li Er was fighting, people like Cheng Lao Demon King, Qin Qiong, Wei Zheng and others were all recruited, but these people all played an incalculable role in his jigsaw puzzle, which was the change of Xuanwumen. They are also the main players, is this Li Er's unique vision, or is it the idea of the eldest grandson Wuji who assists him?

The eldest grandson queen married Li Er at the age of thirteen, and since then, the eldest grandson Wuji has bet all his bets on Li Er, and has served as the number one think tank around him for a long time. The most obvious example is that after the crown prince Li Chengqian plotted to rebel and was deposed, Li Er intended to pass on the crown prince's position to the talented Wu King Li Ke, but the eldest grandson Wuji dispelled Li Er's idea with just three words, these three words are [inappropriate], Li Er is this scruples about the energy of the eldest grandson's family, or is it the ability to see the eldest grandson Wuji's ability to recognize people?

For a while, Liu Yuan's thoughts were like wild horses on the loose, and he was distracted.

"Liu Yuan, what are you in a daze, haven't woken up yet? Don't look at what time it is, if the courtiers of the Tang Dynasty are like you, what will this look like? Li Er was very dissatisfied with Liu Yuan's attitude, and dared to call him by himself, as if he didn't want to, what does this mean?

Sleeping lazy has always been Liu Yuan's favorite, if you can be greedy for late, you will never rush early, this is the creed of Liu Daguan, and when he heard the words, he immediately said with a wronged face: "Your Majesty, you don't know the way, Weichen thinks about things, they all think in the dead of night, at this time the brain is the brightest, and it is also the best time to work, like the cement road project in Chang'an City, which is drafted and planned by Weichen in the middle of the night. It's equivalent to doing twice as much work as others, Your Majesty, you have to add more money to your ministers. ”

"Go and work hard, I naturally can't treat you badly." Li Er said helplessly.

To be honest, Liu Yuan always uses this excuse, Li Er doesn't know if what he said is true or not, which is also a reason why Liu Yuan does not go to court, but Liu Yuan has the ability, which is obvious to all, those who become big things are not informal, and Li Er also let him go.

There are a lot of obedient and submissive ministers, there is no need for another one, talented and good at creating miracles, this is what Li Er lacks the most.

"Your Majesty, what are you holding in your hand?" Liu Yuan asked curiously.

Finally getting down to business, Li handed the iron rod-like thing on Li Second-hand to Tang Jin, and then said lightly: "Tang Jin, it's up to you." ”

"Yes, little obedience" Tang Jin hurriedly took the rod with both hands.

After taking this thing, Tang Jin's face had a look of pride, and he said to Liu Yuan proudly: "Young Master, you see, this is what we just made, called Fire Hammer, in fact, it also belongs to the young master's concept, but we will realize it with real things." ”‘

After speaking, he handed the fire gun to Liu Yuan. Then he continued: "Young master, please see, this is the mouth of the fire gun, we will fill it with gunpowder here, carefully compact it, fuse it, and put one or several iron pellets in front of it. At that time, the fuse is lit with a fire breaker, and the force of the gunpowder explosion is very large, and the iron pellet will be pushed out, and the lethality is amazing, but the power of the explosion is too great, and the fire bolt will be blown apart. Many soldiers were injured because of this, but it was too thick, and it was difficult to lift, after many tests, it was found that it was best to use a whole piece of wrought iron, which was relatively strong, and when the iron pellets were beaten. Its accuracy can also be guaranteed. ”

As he spoke, he gestured in it.

As soon as Liu Yuan heard it, he immediately understood, this is also the prototype of the musket, and it is good to have this kind of achievement in a short period of time, this is scientific research, and it is important to take one step at a time. You can't ask them to create a weapon of mass destruction as accurate as the sniper rifle of later generations, and to create an idea from scratch, from imagination to reality, and I don't know how much effort and sweat it takes.

The eldest grandson Wuji said on the side: "General Liu, gunpowder was invented by you, according to Master Tang, this idea of the fire system. It's also from your mouth, this fire gun is finally made now, and the eldest grandson and the emperor are very satisfied when they see it. But I'd like to hear what new ideas you have. ”

"Yes, if you have anything, you can say anything, if there is anything to improve, and give more opinions, you must improve it well, I want to develop it into a secret weapon of my Datang."

"Is it convenient to put a gun? Wechen wants to see the effect. ”

Li Er nodded and said, "This should be, Tang Jin, you can put another gun." ”

"Yes, Your Majesty."

Tang Jin answered, Ma was skillfully filling the gunpowder, just as he was loading, two guards were watching beside him, it is estimated that he had just seen the power of the firecracker, and he put the firearm at Li Er, which was not good for Li Er, and Tang Jin did not mind, he skillfully filled the gunpowder, compacted, lead, and put the iron ball, and when everything was ready, he aimed at the armor about ten steps ahead, and the guard next to him took out the fire fold and lit the lead.

There was a loud "bang", Liu Yuan only felt a shock in his ears, and saw a flash of sparks from the mouth of the fire gun, and the iron ball hit the armor in front of him at once.

"Ahem" This gunpowder is not smokeless gunpowder, after the first shot, there was a choking smoke at the scene, and Tang Jin, who was close, choked.

Liu Yuan didn't care to appease Tang Jin, and immediately walked towards the armor, this is a piece of Mingguang armor, high quality, cold and shining, it can be seen that it is a fine product, but Liu Yuan was in the place where he hit, and found that the hole was pierced by an iron ball, the hole was smooth and flat, and ordinary people couldn't do it at all, this is the power of science and technology, with firearms, these armors seem to be all paper paste.

Before Liu Yuan could speak, the eldest grandson of the First Emperor, Wuji, said happily: "Your Majesty, you see, it's exactly the same as just now, the bright armor has been pierced, a divine weapon, a divine weapon." ”

Before Liu Yuan arrived, the two had already tried guns, but this was beyond their personal comprehension, and he was still very excited.

Li Er also picked up the pierced armor and looked at it, and there was also shock and excitement in his eyes.

Liu Yuan didn't have much excitement, took the iron gun from Tang Jin's hand, looked at it carefully, only felt that the iron gun in his hand was a little hot, just now when the gunpowder was blasted, it generated a lot of heat, and iron is a good conductor of heat transfer, these irons have not been specially treated, so it is reasonable to be hot, Liu Yuan used the small stick that had just compacted the gunpowder to check the chamber position, see the burning of the gunpowder, and then carefully looked at the position of the chamber.

"Don King"

"The little one is" Tang Jin has been waiting beside him, and as soon as Liu Yuan called, he immediately responded.

Liu Yuan said lightly: "Your fire gun is doing okay, which is a huge improvement, but I can only give you a good evaluation." ”

"General Liu, you are too harsh" The eldest grandson Wuji on the side said unfairly for Tang Jin: "This fire gun can be called a divine weapon, only give a good one, it is unfair, if the eldest grandson says it, it is not too much to give a special gift." ”

"Don't worry, Captain Changsun, listen to what Liu said, you will understand immediately."

The eldest grandson Wuji nodded and said, "Okay, then I'll listen to it." ”

Liu Yuan motioned for Tang Jin to come closer, pointed to the small crack in the chamber and said: "You see there are cracks here, if I guess correctly, your firearm can only be fired a few times, and after a few times, the chamber will have to be cracked, and the whole firebolt will be scrapped, and it needs to be reforged in the furnace, is this true?" ”

"Young master, I really can't hide anything from your eyes, little admiration" Tang Jin said with admiration: "That's right, although I have forged it very carefully, but no matter what, I can only put five rings at most, and the fire gun will have to be scrapped, when forging, even if there is a trachoma or small hole, it will be wasted, and only one of the ten forgings can be used at most, so it is very high, not suitable for large-scale equipment, young master, you say, is there any way to improve it?" ”

The layman looks at the excitement, the insider looks at the doorway, Liu Yuan pointed out the most critical point, Tang Jin's eyes lit up when he heard this, and he hurriedly asked, this fire gun can be said to be designed by Liu Yuan, and the gunpowder is also from Liu Yuan's hand, he must have his own independent opinion on the fire gun.