Lightning swung like a snow-white sword in the black oppressive sky, and the surrounding rain was dense like a curtain of water, adding an unknown sense of depression to the atmosphere of the battlefield. The deafening thunderbolt, played in a dull voice, was like a violently whipped rattan whip, accompanied by bright light cutting through the black sky again and again. The sky was like a trail of light that had been torn apart, and it was like a giant beast grinning with its bloody mouth, trying to devour everything.

This is summer in Khai province.

It is also affected by typhoons, although the degree is far from comparable to the seaside area, but in the middle of summer, the sea breeze roars, the rolling wind blows from the ocean, and every time there is a storm and rain, you can't change it, so you have to learn to adapt to it.

The aftermath of the typhoon, known to future generations, is a common occurrence that must be encountered every year. Even this kind of weather can be a real annoyance for the besieging side.

The city of Guizhou is not large, and the surrounding area is only ten miles. In China, this is a very ordinary state city. However, after being renovated by Xu Huiyan at any cost and at any cost, the city suddenly became the first city to withstand artillery bombardment and crypt siege methods. It was always Xu Huiyan's magic reform that directly reduced the area of the entire city by more than two percent, and the population was reduced by nearly half.

In the entire Guizhou City, the thickness of the four walls of the city is as much as ten zhang, which brings the strongest defensive thickness to Guizhou City. It doesn't matter if you fire a cannon or blast a crypt, it is difficult to destroy a city ten feet thick in one fell swoop, even if it is rammed earth.

Originally, the cannons of the Qi army could sweep the female wall of the battlements directly, but now the problem is that the female wall of Guizhou City has actually been transferred to the five zhang of the original female wall, and in the middle of this thick city wall, Xu Huiyan re-erected a female wall. Not only that, but the inner wall of the original women's wall was also demolished by him in one fell swoop. That is to say, only the outer wall of the original female wall still exists, but the back heart is very cold. The Qi soldiers who climbed to the top of the city were about to be attacked on the second city wall as soon as possible!

Even if the height of the second "wall" is very low, they are essentially women's walls on the wall of the wall, and the height is only five feet.

However, with a gap of five zhang in front, it would be obviously difficult for the artillery of the Qi army to bombard the two 'city walls' directly. Because the shells coming from outside the city were fired in a straight line. The cannonballs they wanted to bombard the second female wall were either blocked by the city wall, or after exceeding the height of the city wall, they flew high over the top of the second line of defense and flew farther away. What's more, the defenders in the city will also drive the people to repair the damaged walls at all times.

This defensive structure is a completely different defense from the current wall defense model. It's kind of like a bastion, though only a hint of it......

However, the real bastion is an intricately designed geometric star-shaped fortress, and the designers have achieved the purpose of covering each other's firepower in different locations through clever design, and can usually cope well with enemy attacks. And there are many Guizhou cities in front of them, which are not like four likes.

Lu Qian's 'help' to Xu Huiyan was limited to the fact that the city could withstand artillery bombardment. And not to defeat artillery in a frontal battle.

At the same time, this is another assessment of the teachers and students of the Wuluo Academy and the staff officers of the Governor's Office of the Five Armies.

According to the existing weapons and equipment of the Qi army, how to efficiently break through such a city?

Xu Huiyan changed Guizhou City in a day or two, and the measures and arrangements in the city have long been clear. The detailed city defense map had long been defeated in front of the teachers and students of the Wuluo Academy and the staff officers of the Governor's Office of the Five Armies.

He is not afraid of "Guizhou City" being made public. In this way, the Dharma is announced to the world, so what can it be?

The fundamental purpose of the fortress is to defend, and it is to contain the opponent's large number of troops with a very small number of troops. And if Lu Qi launches an offensive against which side, will Emperor Lu still lack soldiers and horses in his hands?

He can organize a large attacking force, and even if a portion of his forces are detached to monitor the bastion and control the supply lines, the remaining force will still be strong enough to overthrow a country. This allows the army to quickly get rid of the troubles caused by the bastion and go straight to the strategic core.

Historically, Europeans began to build huge and expensive bastions on a large scale in the fifteenth and sixteenth centuries, and the slow mode of warfare around the fortress lasted for two centuries until the eighteenth century. The most important reason for this is that at that time, the military strength of European countries was scarce, and the Europeans were not rich. After entering the eighteenth century, especially in the second half of the year, whether it was the Seven Years' War or the Napoleonic Wars, the military strength of European countries increased geometrically.

In Prussia, for example, when Frevice II took over the scepter from his father, Frederick William I, there were only 80,000 troops in Prussia, and by the time the Seven Years' War began, the Prussian army was already 200,000 men. By the end of the century, by the time of Napoleon, the major European powers were generally able to storm their armies.

Therefore, the fortress is also outdated. And is such a problem really a problem for Lu Qi and for China?

Not to mention, today's artillery is still China's unique weapon, and if outsiders don't have a cannon in their hands, they can't give full play to the essence of the fortress, even if Xu Huiyan can only use a strong bow and a hard crossbow. The effect is completely different from the artillery.

That is to say, this fortress was taught to them by hand, and its role can only be a single defensive measure, or a congenital defect.

There is no even need for him to teach him hand-in-hand, when each 'enemy' feels the threat of artillery, they will try their best to thicken the city defense, the only difference is that Xu Huiyan's thickening scale this time is a bit large, and it is in one step.

The attack and defense of Guizhou City is simply that the artillery outside the city keeps bombarding, and the arrows and crossbows inside the city keep shooting. The former is because Li Yanxian has not yet come up with a proper way to break the trapped residence in front of him, and the latter is because the defenders in the city only have bows and crossbows to repel the enemy.

When the Qi army feinted during the day and attacked and harassed at night.

The topography of Guizhou City is high in the northwest and low in the southeast, resembling a lying cow. In terms of city defense facilities, the northwest was originally relatively strong, and the southeast was relatively simple. Because the water flows downward, and there have been no battles in this place for many years, the city has long been old. The southeast city wall was semi-collapsed before Zhao Huan and his party settled in. But now, everything is a standard.

Xu Changyan served as the Sibi promotion officer, and after Xu Huiyan settled in Guizhou, he naturally returned to the army. Although Xu Changyan is not a famous general, he still has a lot of combat experience.

Now he is at the head of the city day and night, commanding the enemy. And the measures are really unique, every night, people pile hundreds of bales of hay under the city, and if they find that there is a harassment / siege of the Qi army, they will light a fire alarm to prevent the Qi army from sneaking attack.

After the Qi army gathered, seeing that Guizhou City was still helpless, Li Yanxian saw that the morale of the army was a little low, so he took Niu Gao as the general and tried to fight a wave, not seeking to really break the city in one fell swoop, but only to boost the morale of the army.

But the results were dismal.

Niu Gao asked the soldiers to hold small earth-shaking thunderbolts, thinking that in this way they could easily occupy the city wall. didn't know that Xu Changyan had already asked people to form a net in the city. The small earth-shattering thunder was blocked by the net and fell straight outside the female wall, and it did no damage to the soldiers inside the wall.

The female wall of the outer city of the city has been beaten to the ground, but the defenders inside the city have taken advantage of the night to repair it again and again. Wicker baskets and rattan baskets were filled with soil and sand, and they even placed them between the outer female wall and the second female wall as a roadblock, so that the Qi soldiers who climbed the city had to avoid it, so that they had to expose the gaps. After that, there is an overwhelming array of bows and crossbows, and there is also the Song Army's version of the earth-shattering thunder.

Zhao and Song also had gunpowder weapons, and they also knew how to configure powder, and even the proportion was similar to that of later generations. It's just that the purity of saltpeter and sulfur, as well as the ingredients that Song Jun added to it, makes its final power a little ridiculous.

However, no matter how ridiculous the power of the earth-shattering thunder falls on people, the effect is also very good.

The attack lasted less than two quarters of an hour, and Niu Gao reluctantly chose to retreat. Helplessly, this kind of onslaught and fierce attack, the loss is too great, and the slightest effect is not visible.

Niu Gao couldn't see the slightest hope of breaking the city, and if he continued like this, he would only try to lose the lives of the soldiers. It is better to follow Li Yanxian's words and continue to dig the crypt and carry out blasting. If you don't work ten times at a time, you can't do it a hundred times out of ten times, you can't believe it!

And it was also at this time that Zhao Huan and his entourage, who fled to Guanzhou in a panic, were hurriedly packing up and giving up the beautiful life that had just been comfortable in Guanzhou for two days.

Because there was intelligence coming from the rear, a Qi army of infantry seemed to smell something and was galloping towards Guanzhou.