"Master Ankong, it's April now, and less than a quarter of the city wall has been repaired in the west of the city so far, and at this rate, it won't be able to be repaired even in May." Bai Liyan (Wei Xian) said worriedly.

"Well, that's true. The old man thought that since he couldn't fix it for the time being, it was better not to fix it. ”

"Don't fix it!" Bai Liyan was taken aback, and hurriedly asked: "Isn't this a "匚" glyph, what if the other three city walls fall!" ”

The triangle is the most stable in the mechanical structure, followed by the quadrilateral, and the stability of the linear structure is acceptable, but there is stress in the wall, and there will be torque when there is stress.

"Could it be that Master Ankong is another skillful?" He boldly asked.

"The new city is actually two zhang higher than the water surface of the Yongxing River, and most of the city walls are also decorations, not to mention that a low wall of about half a zhang has been erected, and it is three zhang away from the river, and it is very difficult for the Black Turban Army to go ashore."

"Having said that, what is the explanation for the fact that the north and south walls are not solid?"

An Kong twisted his short beard and smiled:

"This matter is actually very simple, one or two miles outside the north wall, and then build a city with the same length as the north wall, and then connect the city with the north wall, so that there is an urn city, so that the north wall can stand.

The south wall is extremely difficult to build such a large one-word city because of the Linguan Tang Canal, so a Wengcheng water port can be built within the south wall, so that there can be a small wharf in the city, which can transport goods, and can also build and repair small ships for the trend. ”

"Hey! Why didn't Wei think that it was still Master Ankong! ”

"Hahaha......" An Kong laughed: "With the wisdom of General Wei, this law can be imagined, but it is not easy to put it into action. ”

The method of Ankong is very simple, directly outside the north of the city, within the south of the city, build a word city wall, and then connect the north and south walls, so as to form a closed rectangular structure, and at the same time there are two large urn cities in the north and south, so that the structure of the new city wall can be guaranteed.

The west of the city has built an earthen wall half a zhang high on the foundation, and the ground is originally higher than the river level, and the distance between the west of the city and the Yongxing River has reached nearly three zhang, and there is almost no possibility of rapid climbing.

Therefore, the construction of the western city wall can be temporarily abandoned, and after the three cities of Tiancheng, Xiaqu, and Weijin are recovered, and the danger of the west bank is lifted, it is not too late to repair the city wall, so that the military function of the city wall can be taken into account, and the construction of the new city can be completed in name.

Just as the two were talking, several fast horses galloped over, Baili Yan looked at it intently, only to feel that it was familiar, and when he looked closely, it was Chen Yunfeng.

"Why is he here?"

Chen Yunfeng guarded Guangxin, in February, Jiang Min sent people to increase the army to the south, and he did not see him personally lead the army south.

Chen Yunfeng's face was panicked and panting, and when he saw Bailiyan, he immediately grabbed the reins of the horse and turned over and dismounted:

"Wei ......" has changed a lot since last year, and when they met again, Chen Yunfeng didn't know how to speak for a while: "General Wei, don't come unharmed." ”

"Brother Yunfeng is here, I don't know what's going on?"

"Alas......" Chen Yunfeng sighed: "All the summer grain in Beihai County is finished!" ”

Baili Yan frowned suddenly, not knowing what it meant:

"Summer grain! Isn't this just a seedling planting, why is it over? ”

"In March, the seedlings began to be planted in various parts of Beihai County, and about ten days ago, the water in the paddy fields suddenly turned blue, and almost overnight, millions of acres of excellent farmland in Beihai County were finished!"

"What, the entire Beihai County is finished! How could this water turn blue? ”

"At first, I thought that someone was bringing seawater into the irrigation canal, but the craftsmen of the dyeing workshop found that the blue water poured into the fields was dye, which was highly poisonous!"

"Hiss......"

Bailiyan's chest sank, and in a blink of an eye, he thought it was basic copper carbonate.

Last year's attack on the Hagijeong Copper Mine was to find that the Black Turban Army was collecting azurite ore on a large scale, thinking that the Black Turban Army would use it to pollute the water source, but now it seems that its purpose is to stifle the war potential to destroy the Xian country, so as to trigger a popular uprising.

"Those bastards!" Bai Liyan scolded fiercely.

"General Wei is well-informed, how can this blue poisonous water be broken!"

Chen Yunfeng is resourceful and decisive, but the tricks used by the Black Turban Army have exceeded the limit of his cognition, and he knows nothing about chemistry at all.

It is almost impossible to neutralize basic copper carbonate without leaving toxic substances with the current means.

Copper carbonate is carbonate alkali, it is difficult to react with weak alkaline substances, it is almost impossible to use conventional straw and lime to remove the harm, the most feasible way is to use weak acid, but with acid, it is possible to produce acid copper, which is still toxic. Further, where to get tens of millions of acres of chemical agents.

The only way is to wait for natural oxidative decomposition. Basic copper carbonate is structurally unstable and naturally transforms when exposed to air, but this takes time.

"Brother Yunfeng, I'm afraid there is no solution to this matter."

"No solution!" Chen Yunfeng said disappointedly: "In this way, how can the livelihood of the people in the county be good, tens of millions of acres of farmland!" ”

"It's not just tens of millions of acres, the blue water in it is blue copper, it is highly poisonous, people will die if they eat it, and they will die after soaking the crops. Moreover, the damage is very great, and it is by no means alleviated in one season, and I am afraid that there is no hope for autumn grain this year. If the poison scheme is applied again next year, it will be another year of harvest. In the long run, Beihai County will be defeated without a fight. ”

Polluting farmland with alkaline copper carbonate cannot eliminate the damage caused by it in a short period of time, and requires a large amount of rainwater erosion and soil infiltration to eliminate the harm of toxic substances. There is no hope for summer grains, and autumn grains may also be affected. Even if the autumn grain can be planted, the Black Turban Army will come again like this, and in the end there will not even be seeds.

"Brother Yunfeng, do you know about this matter Guangxin Gong and Mr. Luo?"

"It was the lord's order that came down to ask for advice, and I didn't want to do everything that even General Wei couldn't do, alas, ......"

"This matter is extremely sinister, and it is a bad plan to cut off the children and grandchildren and destroy the conscience of heaven. There must be traitors secretly cooperating among them, otherwise it would be impossible to poison the entire Beihai County. ”

"We coincide with Mr. Luo, and there must be traitors who take advantage of the night to throw poison into various canals to poison the grain fields."

"Yes, this hand is really vicious, and this matter has not yet appeared on the east bank of the Yongxing River."

Bai Liyan thought to herself, the reason why the Black Turban Army did not attack in the Black Turban Army was because the land of the capital county where the Song Ling was located was fertile and it was the key target of the Black Turban Army.

The second is that he is in charge here, presumably the Black Turban Army has been repeatedly defeated last year, and he should already know that he can break its evil arts. The Black Turban Army was worried that it would not be able to poison the Xian Army with this method, but would be used by Baili Yan again, and under the superposition of various factors, the Black Turban Army did not dare to poison the capital county.

Not poisoning the capital does not mean that it will not be poisoned outside the territory occupied by the Black Turban Army, but it can be poisoned in Beihai County, and of course it can be poisoned in other counties of the countries to weaken the war potential of the countries.

The high concentration of alkaline copper carbonate is highly toxic, but after all, it is impossible for the black turban army to be industrially prepared, and it can only be collected naturally, so the dose of poisoning will not be too high, and its toxicity is low, and the short-term damage to the human body is not obvious, but it is extremely damaging to plant roots.

With the washing of rain, the infiltration of the soil, and the degradation of natural reactions, the soil will purify itself, gradually lose its toxicity, and after a year or two, it can resume farming, but in a year or two, how much income will the nations lose, and how many people will starve to death, and how many people will be forced to rebel, this is where the sinister of the Black Turban Army lies.

"Brother Yunfeng, report this matter to Zhao Shuai in the next place, as for how to deal with it, it is difficult to say."

"Okay, I'll leave this matter to General Wei."

Not long after Chen Yunfeng left, Master Ankong said angrily:

"Such thieves destroy the conscience of heaven, and everyone will be punished!"

Bai Liyan smiled bitterly:

"The major affairs of the country of soldiers should be done at all costs, benevolence, righteousness and morality are only the excuses of the weak, and they can do whatever it takes to achieve their goals, and the Black Turban Army does exactly that."

"But where are the people......

"Having said that, but the trend of civil change in the world, how can it not be a tragedy caused by the king without investigation, if the black turban army is guilty, what crime should the kings of the countries become."

Man-made disasters are worse than natural disasters, An Kongzhi saw the cruelty behind man-made disasters, but he didn't think about where the root cause of man-made disasters was, if it wasn't for the kings down to the powerful officials, there were problems at every level, how could it provoke the popular uprising that swept the Central Plains.

If the Black Turban Army wants to survive, it must learn to be cruel, and the essence of war is cruel, who is more cruel, who will be more able to win the initiative in the war.

It was already afternoon when he rode to the Chinese army camp, and after the Black Turban Army stepped up the offensive in the northern section of the Yongxing River, Zhao Xun had been running around.

Because the Black Turban Army retreated in the northern section of Yongxing River, forty miles away from Ruitian Village, the defenders of Ruitian Village rashly attacked and were easily annihilated by the Black Turban Army. For this reason, Zhao Xun was considering ordering the cavalry to attack and detour to the rear of the Black Turban Army.

"Wei Xian, when will your department be able to attack?"

"You can attack at any time, but there are only 5,000 men and horses under the command of the last general, and the main force of the Black Turban Army is 500,000 all facing each other in the northern section of the Yongxing River, and only 5,000 people cross the river.

"Well, this marshal is considering ordering Ye Xin to join forces with you as the governor of the cavalry army and attack to the west and north, what do you think?"

"I don't know how many soldiers and horses Zhao Shuai plans to dispatch?"

"Thirty thousand, two war horses per person, can run long distances, you see how it is."

"This is very good, the last general asked Zhao Shuai to allocate more than 10,000 sailors and hundreds of large warships to accompany the expedition."

Zhao Xun asked puzzledly:

"Why is that?"

Bai Liyan walked into the topographic map, pointed to the Milong River and said:

"Zhao Shuai, the Milong River is wide and deep, leading to Xianxi and Chunan counties, and even flowing all the way into Sun Guo.

"So what?"

"People boil water to live, farming must be based on the water source as a channel, so the rear of the Black Turban Army to cultivate the land, must be attached to the water source, so there must be a large number of people farming here within a hundred miles on both sides of the Milong River, and the final general intends to go north or south along the Milong River west.

If there were warships with them, they could transport all the captives and baggage by warships, so that they did not have to suffer from the difficulties of migrants. ”

"But in this way, the route of the march will be understood by the Black Turban Army, and if it is used as an ambush at that time, what will happen?" Zhao Xun asked.

"Our army of 30,000 men has two horses each, and can march quickly for five to six hours a day, and the two horses alternate in turn, and the daily feasibility is less than two hundred li, and more than two hundred and sixty li.

The Black Turban Army was different, although its cavalry and horses were numerous, they could not march with two people and one horse like our army, and it was difficult to chase from behind.

The navy can march day and night, and the water can travel at least 150 miles a day without getting tired, so the cavalry and the navy can advance in tandem. If you are besieged by the Black Turban Army, if you can fight, you will fight, and if you can't fight, you will use the convenience of horses to escape, and if you can't escape, you will kill the horse and ship to protect yourself. ”