Of course, the Great Wall is a lock, for Zhuxia or other races, and countless wars between farming peoples and nomads are basically carried out around the lock of the Great Wall.
The Central Plains Dynasty was able to control the Great Wall, even if it did not have the strength to counterattack, it was able to resist the enemy army coming from the direction of the grassland outside the mountains of the Great Wall, and protect the counties in the rear from being ravaged by Hulu.
On the other hand, once the nomads broke through the Great Wall, they would be able to enter the counties and counties of the Central Plains Dynasty, even if they didn't grab some big cities, especially those villages that were not protected by the city walls, they could still grab a lot of money many times.
Sang Yu is against the demolition of the Great Wall, not because he doesn't want future generations to see this epic wonder, and it is not that it may be demolished and it will be built.
It has to be said that the total length of the contemporary Great Wall may be much longer than the Great Wall built in the Ming and Qing dynasties, and the east is Liaodong, which is connected to Dunhuang all the way.
Although there are some "blanks" in the middle, there is generally the existence of the Great Wall, which makes the Great Wall look like a giant dragon entrenched in the earth.
"Your Majesty, most of the Great Wall is built on top of mountains, and it is not easy to demolish it."
Sang Yu didn't dare to directly confront Liu Yan, and said reasonably: "The Han Dynasty does not need to rely on the danger of the Great Wall, nor does it need to be a vigilance, just let it go." ” Liu Yan just thought about it, and if he really used a huge amount of manpower to demolish it, it was better to turn a blind eye and let the Great Wall fall into disrepair and collapse with the passage of time.
Yu Yi, who has been silent, is thinking about something else, the Han State is now gathering people into counties, and the settlement has no longer built city walls, there was once a dynasty that also adopted the same approach, and then waited for the country to be decadent, and there were incidents everywhere in the territory, and smoke was everywhere, and everywhere because there was no city wall as a support, the speed of the fall was faster than one place.
The dynasty that Yu Yi thought of was the Qin Dynasty, and after the first emperor completed the sweep of the Eight Desolations and Liuhe, he not only ordered the counties to demolish the city walls, but also ordered the demolition of various passes.
What kind of idea did the First Emperor have in mind to issue such an administrative order, and later generations can only rely on speculation because there is no relevant written record.
Most speculation is that the First Emperor probably felt that the cities everywhere had walls, and in the event of a rebellion, the walls would become a barrier for the rebels.
Then, the Qin army can fight well, and there is no need for the city wall to defend the city at all, and the war does not rely on the city wall, but is an army composed of people.
In fact, if you consult the historical books or geographical records, you will find one point, first of all, Xianyang is a metropolis without a city wall, and the counties in Guanzhong have such a barrier as Hangu Pass, only some counties around Hangu Pass have built city walls, and the more west or north they are, there are actually no city walls.
So why did the first emperor order the demolition of the city wall in various places, there is some reliable speculation, the cities in Guanzhong in the land of Longxing have no city walls, why do they need city walls in places other than Guanzhong, isn't it unanimously on par with Guanzhong "The widow naturally knows that it is the demolition of various passes, and Qin no longer has any danger to defend, so that Han Gaozu can attack Xianyang with a partial division.
Xianyang also had no city defense to rely on, and in the event of civil strife, Ziying had no choice but to lead hundreds of officials out of the boulevard and surrender.
Liu Yan naturally ignored the fact that Qin had to repair a few passes and city walls, or Wu Guang would have taken the pass directly to how it was stopped in Xingyang, and Liu Bang did not need to go through the pass: "The national capital naturally needs to be dangerous in case of accidents." ” Sang Yu didn't directly say the disadvantages of not having a barrier, he reminded him vaguely, and seeing that Liu Yan was sensible, he naturally wouldn't say anything further.
The reason why Liu Yan thinks that the counties do not need the city wall is that the Han kingdom that came out of the ruins, and without the premise of an imminent threat, should first use manpower and material resources where they are most needed, such as repairing water conservancy and irrigation facilities as soon as possible, and keeping the roads in each county in good condition.
Another point is that Liu Yan is very clear about the current situation of the Han Kingdom, which is currently in a state of sharp population decline, and the number of people in each county is actually quite limited, and the construction of the city wall will inevitably not be repaired, and the population increase will be too small in the future, and the city wall will make the residential area expandable.
The most important thing is that firearms have been presented, and they will develop better and better with the passage of time, and the military role that the city wall can play is repeatedly reduced, waiting for the war to become the roar of artillery, and the soldiers are also fighting with muskets, and the city wall that has been built with huge manpower and material resources is a matter of several heavy artillery bombardments.
In the war of the firearms age, if you have the effort to build a city wall, it is better to choose favorable terrain to build a fortress containing underground fortifications, and at the worst you can pull barbed wire and dig trenches, which is not more cost-effective than the city wall Speaking of firearms, Liu Yangang received a piece from Chang'an, mentioning that the rifle that had been studied for a long time had already achieved results, and the physical objects and drawings were sent from thousands of miles away.
The real thing Liu Yan saw didn't look like a rifle at all, and it was appropriate to call it a gun if he insisted on saying it.
It was a big one, two meters long, and the barrel accounted for six or seven tenths.
It is still in front-loading mode, which requires charging before throwing in the projectile, and the excitation device uses flintlock, which directly skips the arquebus mode.
"The caliber is 20 millimeters" Liu Yan can certainly lift the big gun, looking at the caliber and commenting: "It's more like a cannon" Not to mention, the caliber of the lifting gun is inherently large, and the caliber of the lifting gun made in modern times is generally more than 15 millimeters.
It is even more exaggerated that the caliber of the gun is 40 mm, and it is better to call it a gun than a cannon.
"Charge."
Liu Yan didn't go to test firing himself: "Try firing." ” Naturally, there were sergeants who were busy with the work of using custom-made gunpowder packets, which were tore apart, loaded the gunpowder into the barrel, and then pushed through with a throughbar.
The next step is to load the projectile, someone brings a matching bracket to support the front of the barrel, and then a person carries the back of the gun.
"Fire" The military officer in charge of shooting pulled the trigger, and he felt a very strong push in an instant, and since he was inexperienced, he took a step back, but fortunately he grabbed the barrel of the gun and did not get it off.
After the trigger was pulled, there was a loud "bang", and a puff of white smoke came out of the muzzle, and many of the people were startled by the sudden movement.
Liu Yan has been looking at the arrow target in front of him, its responsibility has become the gun target, after the gun sounds, the gun target is safe and sound, but it is difficult for the naked eye to see the front 1,600 meters away The projectile drilled into the ground and a cloud of sand and dust came out. “” Seeing that there was nothing wrong with the gun target, everyone unanimously looked at the sergeant who was operating the shooting, which made the sergeant's forehead sweat instantly break out.
According to some records, the farthest range of the gun in the Manchu Dynasty was up to 2,280 meters, which was the range of the artillery, but the accuracy was almost none.
Liu Yan has already seen it just now, the barrel is not a rifled mode, and it is destined to have no accuracy.
He would not let the sergeant be pulled down and cut down just because the sergeant did not hit the target, but only signaled to continue charging and shooting.
Again, the sergeant was in charge of shooting, and this time he was far more nervous than the first time, and he had asked all the known gods in his head before he pulled the trigger.
His luck was very good, and this time it was a no-brainer.
Again, the gunfire rang out, and the gun target that was placed about 100 meters was shattered in response.
It's true that the target is broken, but not only the projectile penetrates, the process of its fragmentation is extremely fast, the sawdust is hit sideways, the hemp rope on it is directly broken, and the support frame is also dragged back several meters by a distance.
"Single-shot cannon."
Liu Yan said a term that no one could understand, and he signaled: "Arrange a few more gun targets, and arrange them as far as three miles away." ” With a hit, and then seeing the target that was hit directly shattered, everyone had a deeper understanding of this new weapon, all because of its power.
Charging and firing again and again, several sergeants in charge of shooting waited for the target placed three miles away to be hit unusually lucky, and then the test shot stopped.
"Within two miles, the hit will inevitably shatter."
Sang Yu stroked the target that was brought back from three miles away, and said with joy: "Even three miles away, there is such a big hole in the hit." ” Yes, it was a large hole, it should be about 10 centimeters in diameter, and the wooden plank that was used as a target was also full of cracks.
"Up to three miles" Yu Yi just deliberately asked the soldiers to probe more, and really found the bullet point: "It is farther than the range of our first-generation artillery" The first generation of artillery of the Han Kingdom was a six-pounder gun, with a firing range of seven or eight hundred meters, and the lethality of the solid projectile was only smashing, but there was no multiple penetration effect, and it would not kill or injure a dozen meters in one shot.
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At present, the Han State has developed a variety of artillery, the largest of which is a 155-mm naval gun with a range of up to six miles.
Projectiles are no longer limited to solid bullets, but flowering bullets and incendiary bullets have also been studied.
It is a pity that the artillery itself and the gun carriage are very bulky, and it is not very convenient to transport.
In addition to Li Tan's recent artillery bombardment of the military camp, there is no place for artillery to exert power, and there is a relationship between inconvenient transportation, and the army is also not equipped with Gyeonggi guards or emperor's guards for the time being.
"I heard that Great Qin or Persia also have firearms."
Liu Yan is not recalling according to his own memory, it is the news sent back by Wang Meng, who sent the envoy: "Daqin has ballistas, and when they shoot projectiles, they will explode, and there are also projectiles that burn on the ground. ” If you calculate the time, Wang Meng should have arrived at the Persian border, but he doesn't know where he is now.
He would travel to the Persian capital of Ctesiphon, and he would travel the rest of the world, with the next stop going to Eastern Roman Turkey.
Rome attached great importance to large equipment, and each legion had a special artisan battalion in addition to a variety of large military equipment.
They began to play with large military equipment after the conquest of Greece, and then began to be out of control, and every time the Roman legions engaged, the shadow of ballistas and catapults could inevitably be seen, and the projectiles fired also evolved from stone bed crossbow arrows to projectile oil bed crossbow arrows.
Liu Yan still knows more or less what the so-called projectiles that explode and burn in Rome are, but they are actually a product made of petroleum mixed with other materials.
"Daqin's ballista is the same as our artillery" Yu Yi arrived and was extremely surprised: "It was researched earlier than us" Liu Yan still needs to explain, everyone was relieved when they heard that it was the bed crossbow and the catapult, and then heard that the projectile was researched with oil, and asked curiously what oil was, and the result was naturally Liu Yan explained what oil was.
Both the Romans and the Persians were short of oil, and each had research in the field in which it was used.
The first country in Europe and Rome to use oil as a military weapon was Greece, and many Roman soldiers at that time were burned by Greek oil to the charcoal of Greek fire.
After Rome defeated and occupied all of Greece, it was only natural that the Romans, who were good at learning, would not let go of the use of oil.
They also discovered that North Africa, the homeland of Carthage, produced oil, and the use of oil became more extensive.
The Persians were still relatively primitive in the use of oil, which was used for burning, usually in jars and jars, and then thrown to burn and wound the enemy.
They also have oil production areas in their territory, and they still don't need to dig it, but they just pop up on their own.
The Arabs replaced the Persians as the ruler of that land, and the Arabs directly made a fire-breathing ship, because the Arabs and the Europa people have always been in an advantageous position at sea, and there is a sea area named "Arabian Sea", and they also cut off the connection between Europa and the East for more than 200 years.
"It turned out to be a bed crossbow and a catapult, and the launch was also oil," Sang Yu was still very proud: "We have really been in the lead. ” If you talk about gunpowder, it has actually appeared in the Spring and Autumn Period, but the power is pitiful, and no one wants to specialize in it.
Gunpowder was a derivative of alchemy for a long time, and then it was gradually transferred to entertainment-related medicine puppets, and it was only at the end of the Tang Dynasty that it was used for military purposes, but because of the formula, the power was still not very good.
Liu Yan began to write later, and he asked for a reduction on the basis of lifting the gun, and at the same time asked about the study of rifled engraving.
It is inevitable that the Han army will use firearms on a large scale, and the first large-scale use should be the navy, and there have been twelve warships used to carry naval guns to launch sea trials, and after waiting for acceptance, they will be transferred to Ah Sanyang, but I don't know if they can catch up with the bombardment of Ah San.
"Maybe five years, ten years at the latest" Liu Yan with a strong expectation: "In the future, the Han will have a large army of rifles and artillery, and they will conquer from the east to the end of the west." ” That day will inevitably come, the object of the war will become Persia, Liu Yan will continue to promote scientific and technological research in his lifetime, artillery and rifles have appeared one after another, as long as he continues to pay attention to it, sooner or later the steam engine will be made out, at that time not only the Han army will sweep the land, but the navy will also crisscross the seas
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