On the top of the city tower, Rong Yi personally waved the long knife in his hand to cut a Chu soldier who rushed up to the city tower in half and pushed it under the city tower.

However, such a move did not have much effect at all. Rong Yan could feel that the soldiers of the Chu army were holding their breath in their hearts. With such a breath of air, they don't care about their own casualties at all, and they must also take this city!

Feeling the resolute will to fight of the Chu army, Rong Yan was also a little annoyed! As a disciple of the Mo family, if he was really attacked by the other party when the city was defending, then what face did he have to meet the lord and the giant?

Not only did the crossbow carts on the city tower begin to speed up, shooting all kinds of crossbow arrows towards the Chu army at any cost. Even the home car that can throw charcoal, Rong Yan no longer kept, and began to use it against the opponent's ladder, but also achieved a lot of results.

However, Rong Yan knew that if he couldn't knock out the qi that Chu Jun was holding in his heart, then these defenses would be broken by the other party sooner or later. After that, he ordered someone to set up an iron pot and began to boil the "golden juice".

Gold juice, that is, boiled feces and urine, this thing is definitely the most powerful weapon to defend the city in the era of cold weapons, and it can be called the earliest biological weapon!

Boiling gold juice can not only burn the enemy, but also the wound it burns will also be contaminated with bacteria, and in the era when there is no antibiotic sterilization, the mortality rate it causes to the enemy is very high! In the future, the more powerful gold juice will also add poisons such as arsenic to it, which will cause even greater casualties to the enemy!

However, the side effects of this thing are too great, once you use it on the battlefield, not to mention killing the enemy first, your own side will be affected by the strong smell of gold juice to our side! It can be described as a weapon that hurts oneself first and then the enemy!

However, in the face of the high momentum of the Chu army, Rong Yu knew that doing so would affect his morale, so he had to move this lethal weapon out, and hoped to use it to kill the Chu army and disperse the breath in the heart of the Chu army.

However, when it comes to using this thing, even Rong Worm himself can't stand the smell. After using this weapon to attack the Chu army, the Chu army began to greet Rong Yan's female relatives constantly, and became more fierce and fearless of death!

Rong Yan couldn't help it when he saw this, and he began to get anxious. At this time, the casualty rate of the guards in the industrial zone also began to rise, and Rong had to recruit the workers in the industrial zone to help defend the city.

And in some places on the city tower, those guys who were originally just workers went up to the city tower, and they didn't have the experience and confidence to kill people, and they could only do some trivial things like burning gold juice and carrying crossbow arrows.

The battle became more and more anxious, and somewhere on the city walls, the gold juice ran out, and the workers could not fail to replenish it in time. The centurion, who was forced to defend on the castle tower, scolded: "The gold juice is not enough, won't you go and get water to boil?" If you don't have enough water, you can burn whale oil, and whatever it is, what can be poured on the enemy is a good thing! Standing here stupidly, do you want to kill everyone? ”

However, the workers could not find the liquid that was relatively close, and one worker said on a whim: "Since there is coal and pots here, and there is a shortage of boiling water, why don't we burn the asphalt and pour it?" ”

Xiangyi's coal and iron industry has also made a lot of progress over the years, and Dai Yan has found a use for some by-products of coking. The most used by-product of coal and coke is undoubtedly asphalt.

Coke is needed for ironmaking, and after coking with coal, in addition to coke and coal coke gas that is directly emitted, the biggest by-product is coal tar. At first, Dai Yan really didn't understand the use of coal tar, so he could only discard it. Later, however, he imitated the method of coal coking, and when the coal tar was further distilled, another substance was obtained: bitumen.

As soon as such a viscous substance between the solid and the liquid appeared, Dai Yan was also very happy. Of course, he knew what this thing was, and he personally gave it the name of the future - asphalt. For Dai Yan, he didn't understand the other uses of asphalt, and the only thing he knew was to use asphalt as a building material to pave roads. With this kind of thing, Tao Qiu also built several roads outside the city to connect the surrounding countryside in the past few years.

Such a thing can be regarded as a basic building material for Taoqiu. And in today's industrial area, in the barrels of the coking plant, there is a large amount of solid asphalt!

And the workers who thought of using asphalt as a weapon happened to be the workers of the coking plant. He immediately called on the rest of the workers to take out several barrels of asphalt from the factory and carry it to the city tower. Then, they began to burn the asphalt in the same way that they had burned the gold juice before.

Although burning gold juice will cause a person's nose to be attacked by biological weapons, this level of attack is nothing compared to burning asphalt. After all, the main ingredient of gold juice is water, and the smell in it is mainly hydrogen sulfide; However, bitumen, especially those refined from coal tar, produce a variety of carcinogenic polycyclic aromatic hydrocarbons when fired into a liquid state!

Moreover, these benzene-containing aromatic hydrocarbons, although their own toxicity is not as good as hydrogen sulfide, but the concentration of aromatic hydrocarbons burned by asphalt is much higher than that of hydrogen sulfide. The smell of such a thing is so strong that it can be smelled on almost the entire battlefield!

The soldiers defending the city walls had seen burnt asphalt in the form of a liquid before, so it was not surprising to this thing. Anyway, now that there is such a thing that can pour the face of the opposite Chu Jun, there is no need to use it in vain!

When the first scoop of hot asphalt was poured on the Chu army on the opposite side, the soldiers who were contaminated with this black liquid immediately fell into great pain!

Asphalt has no fixed melting point, this thing can be softened when it is dozens of degrees, and it sometimes takes 100 degrees to really completely melt into liquid, and sometimes it takes hundreds of degrees, but to be able to achieve the effect of splashing asphalt like splashing water, the temperature is at least 300 degrees or more! After all, the gold juice is boiling water, and with some special things, the temperature is only 100 degrees, even if the damage caused by water vapor is greater, it will never exceed the asphalt in terms of total temperature! The higher temperature of hot asphalt than boiling gold juice also determines that its lethality is far greater than that of gold juice!

Compared with the damage of asphalt to gold juice, the most powerful thing is that once this thing is stained, it cannot be erased at all! In the afterlife, even if a person's clothes are slightly stained with asphalt, they will never be washed off without gasoline!

What's more, in the case of the Song army's defensive operations now, these asphalts were directly poured on the Chu army in a liquid state. Once Chu Jun's skin is contaminated with these asphalts, then their skin will fall into permanent damage, and there is no way to remove these asphalts, and avoid the damage. And these asphalts don't stay in one place, they will continue to flow, which will cause even more damage!

The coal tar asphalt made from coal tar is different from the petroleum asphalt refined from petroleum in later generations! It is less stable than petroleum bitumen, and it is more likely to burn in a molten state. The direct result of such a specific situation is that as soon as these hot asphalt squares are poured on the ladder, the ladder, which was originally attacked by the car with little effect, was even directly ignited!

Waves of fanatical Chu troops rushed up against these ladders, only to be confronted with these hot asphalt. Whoever is poured on it, although they do not die on the spot, they all feel that they are more painful than they are dead! These black liquids were contaminated on the bodies of the Chu army, and these soldiers couldn't get rid of these maggots, and they couldn't stand such a high temperature, the only thing they could do was to cry!

A soldier's left hand was stained with asphalt, and he tried to erase it with his right hand, but the moment his right hand touched his left hand, the two hands stuck together. Then the man, in excruciating pain, began to howl and scream. In such a situation, he also needed to dodge the arrows shot from the city wall, but if he was not careful, the soldier fell directly from the ladder, and he did not know whether he was alive or dead!

When such a thing came out, those Chu troops who vowed to avenge Sima with one breath also collapsed! They weren't afraid of death, but they were afraid of this mysterious liquid that was so powerful that it made their lives worse than death. Chu Jun privately gave this black liquid a name: Witch Ghost Water!

In the minds of the generally superstitious Chu Jun, such a "witch and ghost water" is definitely not something that can be contended with manpower!

The pressure on Rong Yan, who commanded on the city wall, was extremely huge, and then he found that the Chu army close to the coking plant was actually repulsed, and when he sent someone to understand the details and know the reason, he immediately sent someone to take out a large amount of barreled asphalt from the coking factory and burn it on the city wall. In a short period of time, this powerful weapon caused huge damage to the Chu army!

The most important thing is that the breath in Chu Jun's heart was also brutally knocked out. Without this breath, the soldiers of the Chu army regained the romantic spirit of the Chu people and immediately became timid as mice. Under such circumstances, Zhao Slip also had to give the order to stop the siege!

However, after the siege stopped, the situation facing Zhaohua was even more encouraging. All soldiers who are stained with asphalt will fall into great pain. And the few soldiers who were contaminated with asphalt in the non-critical parts also turned black and ugly!

Seeing the tragic situation of these soldiers, Zhao's eyes became extremely gloomy. He didn't expect that such a small industrial area close to Suishui would be so difficult! The walls of the other side are so hard, and the powerful bow and crossbow in their hands shot out a left hand from 500 meters away, and now there is such a "witch water" that can inflict such damage on the siege soldiers!

Seeing the power of asphalt, Zhao Slip had to agree with what the soldiers called it. However, if Zhao Slip knew that the anthracene, phenanthrene, and pyrene decomposed by this thing at high temperatures were all toxic substances with high carcinogenicity, and the soldiers who were scalded by the asphalt, even if they could return to their hometowns, their lives would not be long, I wonder what they would think?

As the Sima of the Chu State, Zhao Hua fought the Qi State, the Wei State, and even personally destroyed the Yue State. However, of all the wars he had experienced before, none had been fought so aggrievedly!

Will this war be able to continue?

If Dai Yan had a clear understanding of the state of the war now, he would have exclaimed: Science and technology are not only the primary productive forces, but also the primary combat effectiveness! Bed crossbows and asphalt, these are all high-tech products far beyond this era, and when used to deal with the Chu army, it is almost a war between two civilizations!

In the industrial zone where it has stopped, there has not been the slightest criticism of the artisan who used bitumen as a biological weapon. On the contrary, after learning the details, Rong Yi immediately commended this kind of lively talent!