In the era of cold weapons, it was very difficult to siege a city, so there were many schemes.

Whether it is a Trojan horse, or a deception, or a siege, a storm, a siege machine and a city defense device, the core is in the city wall itself, the city wall is the biggest protection of a city, and all the battles in the siege are the beginning of the surrounding city wall.

Either the city wall is not given a chance to be used, or it is directly over the city wall, and the reason why the ladder has become the core of the siege equipment is so.

That is, at the end of the Song Dynasty, the appearance of the return cannon made the city wall under great pressure, and the heavy, with huge kinetic energy, the return cannon could attack the city wall, but this attack required a large number of return cannons, attacking in one direction, which could require very high strength and accuracy of siege equipment.

Zhao Xin took out the cannon, of course, it was not the return cannon, Zhao Xin, who had already taken out the tree cannon, knew very well what an inefficient weapon the return cannon was, and what he took out was gunpowder.

Zhao Xin was not a warrior, and he didn't know much about military matters, but he also knew that the use of gunpowder in siege and the large-scale use of gunpowder in siege were actually in the Taiping Heavenly Kingdom period, when cold and hot weapons were at the junction, the emergence of a large amount of gunpowder made it possible to use gunpowder to siege cities.

When the soldiers defending the city did not come out, they chose to dig tunnels, dig tunnels under the city walls, and then use coffins to bury 1000-2000 catties of black powder under the city walls.

A large amount of black powder exploded, and the impact force was enough to break the entire city wall.

The city wall is the only protection of the ancient city, once the protection of the city wall is missing, it is equivalent to saying that a lot of protection is reduced, as long as the city wall is broken enough, forming a huge gap, caught off guard, enter in one fell swoop, coupled with Ouyang Xiu's psychology and the pressure of persuasion, the stubborn resistance is basically equal to zero, which is also the fundamental way to solve the problem quickly.

This is also the only way that Zhao Xin thought of to solve the problem quickly, this is not elsewhere, this is Baozhou, from the Liao-Song border, that is, a distance of one or two hundred miles, paper can't contain the fire, plus Liao, in the Northern Song Dynasty, there will also be a lot of spies, even now, with the help of the Baozhou mutiny, the entire Liao-Song border has been blocked to prevent secret agents from infiltrating each other.

But this method, if you prevent it for a while, you can't prevent it for a lifetime, and after a long time and many times, it will always be known by the Liao State.

This is the worst result, the battle between the Liao and Song dynasties is all-round, why the Western Xia is the tail of the big one, one reason is that the Western Xia gave birth to Yuan Hao, who is not a male lord, whether it is the iron fist of governing the country, or the talent for war, he can be called the top-notch, such a terrible guy, the Western Xia from a regional power, to one of the three kingdoms, even longer than the existence of the Liao State.

The Northern Song Dynasty could not defeat the Western Xia, or even half of the strength was enough, but every time the Northern Song Dynasty gained the upper hand, the Liao State would jump out and use a mediation posture or a method of border pressure to make the Northern Song Dynasty either stop attacking the Western Xia, or not be able to go all out.

In this way, the Liao State played quite smoothly, the Liao State and the Northern Song Dynasty were like a fierce beast that was constantly looking for prey, occasionally there were common enemies, but most of the time they were wary of each other, and once they had the opportunity, they didn't mind attacking each other.

Once the Liao State knows everything that happened in Baozhou in the Northern Song Dynasty, it is almost certain that they will move, because it is obvious that they will take advantage of it, why not do it, as long as it is beneficial to move a little, it is good to stick it, and if there is no benefit, it can also be blackmailed by other means, anyway, why not do it if you get the benefit in vain.

This is exactly what Zhao Xinsuo does not want, he is a traverser, and at the same time the only child of Renzong, whether it is the identity of the traverser or the blood of the royal family, he must bring the crown of the Northern Song Dynasty.

Although, with the card system, with the insight of the traverser, even if it is a nightmare mode, he can still clear the level, but how much China's heritage will be lost, just like the current Baozhou mutiny, even if it is in the history books, only a short paragraph is written, but the final casualties are tragic, Baozhou's population of four or five hundred thousand, almost half of it has been removed, and more than 10,000 elite soldiers have died.

These may be part of the dynasty in the future, and with his power to shock the world, he died in vain under the loess of Ai Ai, which has to be said to be a kind of sadness.

If he has the ability to end this rebellion as much as possible, Zhao Xin is willing to do everything, just to provide a little gunpowder.

Gunpowder has appeared for a long time, probably in the Three Kingdoms period, or even earlier in the Warring States Period, but when applied to the military, that is, in the Northern Song Dynasty, before, the power of gunpowder was not large, more was to make all kinds of fireworks, with the deepening of gunpowder research, the power began to appear, the Northern Song Dynasty began to appear a variety of gunpowder weapons, and even in order to increase the power of gunpowder, arsenic was added to it.

But it's useless, the biggest power of gunpowder is its explosion, when the gunpowder is ignited, and then the power of the explosion, there is a golden ratio in this, not the more other materials are added, the better, but the purity of the gunpowder itself.

In this era, there are many gunpowders, but when the tree cannon is completed, Zhao Xin has already purified the gunpowder, and in the purification of various physical and chemical substances, Zhao Xin finally purified most of the materials to more than 9 cities, plus the increase of ancient chemistry by 3%, it cannot be said that it is perfect gunpowder, it is almost the same.

Since there are impurities, of course, it can't be according to the golden ratio, fortunately, Zhao Xin has a card system, after some fine-tuning, and even a series of attempts, Zhao Xin also made a more reasonable perfect gunpowder, and also specially granulated the gunpowder.

Granulation, in fact, is mostly used on the propellant, and in the barrel, the more fully the gunpowder burns, the more powerful it is for the gun, because it can maintain a higher rate of fire.

On the contrary, when it is used as explosives, it doesn't have to be like this, but Zhao Xin made it easily, and the effect is not bad, a little more powerful than before granulation, Zhao Xin's synthesis method cannot reach the level of precision purity of later generations, but compared with those soil gunpowder in the Taiping Heavenly Kingdom, the power is much greater, and the amount of use will be much less, so according to the coffin, one is enough to break the wall of Baozhou, but Zhao Xin prepared three or four.

Of course, at this time, Zhao Xin did not give detailed data, and the method for Sun Ji was quite mysterious, but only asked Han Qi to dig a tunnel under Baozhou and dig it under the city wall, and then, everything was left to them, and they would give him a surprise.

Digging tunnels is also a common method in the siege of the city, Han Qi has also considered it before, but this time it is three tunnels, and the amount of work is a bit large, but waiting for Ouyang Xiu's time is better than nothing, he just gave an order.

He was also very curious about why Sun Ji was so swearing, which could show that he could quickly capture Baozhou. Attacking a city is no better than defending a city, it requires a huge sacrifice, but Sun Ji is very mysterious, he didn't tell Han Qi what exactly he was preparing, just let Han Qi prepare the authentic.

Maybe before, Han Qi wouldn't care, and even would be furious, Han Qi's arrogance was quite famous in the Renzong Dynasty, otherwise, he wouldn't be able to say that Donghuamen was a good man, if he was an ordinary person, he would have been angry, but when he saw Miaojiazhuang, the longbow team and the fortress, it can be said that it is the biggest gain, 4000 sets of foot armor, let him reduce a lot of losses when he sieges the city, and the same is true for the longbow team, even if he has such and such problems, with them dominating the siege side, Plenty of space can be given to the Longbow team.

In this case, Han Qi, who was in a good mood, also held, perhaps, the idea that it is really possible to use the tunnel, at least, this waste can also be used in the future, not necessarily with the main attack of the tunnel, but it can be used to disperse the opponent's strength, and the opponent must send people to guard against the tunnel, of course, if the other party is really careless, they use the tunnel, and the difficulty of capturing Baozhou City will be greatly reduced.

Far longer than expected, the movement was a little bigger when he came back, but there was no change on the Baozhou side, in fact, in defeating the Yunlong Army, it was already Wei Gui's greatest strength, otherwise he would not shrink his forces, and all of them would return to Baozhou City.

Back in the barracks, the first thing Han Qi announced was to select qualified personnel from all armies and allocate 4,000 sets of infantry armor, which would become the main force of the siege.

For the first-class forbidden army on these borders, the number of foot armor is still a lot, but there are so many more, each army can be divided into 400 sets, which is really a lot, which is equivalent to a great increase in strength, Han Qi's order is very supported by everyone, on the contrary, there is another order, not many people pay attention to it.

Han Qi ordered to dig a tunnel, and it was three to dig together, the tunnel was originally a method of attacking the city, the probability of using it was not very high, and the success rate was low, but it was also a trick, and it didn't take many people, about 100, and then the shift could be changed, from their position to Baozhou City, it may only be less than 500 meters, and it will take more than ten days to dig it well, compared to 4000 sets of foot armor, he is really inconspicuous.

But no one would have thought that it would become a variable that changed the Baozhou mutiny, which could have lasted for a long time, ushered in an opportunity to end earlier.