Before leaving, the commander Boyan stayed alone in a large tent, and he knelt quietly on the carpet.

In front of him were the bodies of three young nobles.

Two were shot in the chest and one in the head!

They were: the deputy commander of Namkhan, the fourth son of Kublai Khan, the deputy commander of Tototumur and Namkhan's cousin, and the son of Möngke------

The commander's face was as pale as water, but his heart was like an ice cave------- and before he had yet to fight, he had lost three promising young nobles at once, including the fourth son of the big boss, and their death was like a conspiracy!!

Even if the big boss Kublai Khan doesn't blame him, he will leave some shadows in his heart, and others will have a chance to talk about it!!!

Therefore, he must win this time, and he must win beautifully------ he stood up and ordered a cavalry hundred-man team to wrap the body in cowhide and send it back to Dadu quickly.

He calmly ordered the whole group to set off.

The corpses of the three young nobles were sent away------ but they still seemed to occupy the heart of the commander Boyan.

The news of the death of the three quietly circulated among the middle and senior officers.

Among this group of people who are animistic shamans, such news will spread more and more.

The other staff members of Deputy Commander Namuhan hugged their heads and cried, their future was completely ruined, and this matter was too incomprehensible to them.

When he received the news of the departure, the deputy commander Namuhan was extremely happy, and he happily rode for a ride with his two senior staff------ and handed over all the work and chores to his subordinates to prepare for the departure!

The deputy commander Namuhan proposed to go to a distant place to pee, and Totomuer flattered him, waiting to defeat the Liuqiu pirates, and wanted to make a night pot from the skull of their big leader, which was used exclusively by the deputy commander!

Hahaha, the three of them were happy and anxious at that time, and they galloped wildly.

There was no one in sight of the peeing place they were looking for, and they didn't know how they died until they became dead ghosts!

The bodies of the three young nobles were sent back in a four-wheeled/horse-drawn carriage.

When the Great Song Dynasty began to use this kind of car, the Tatars immediately learned it, and in order to save themselves trouble, they shamelessly asked the Great Song government for steering equipment and bearings, as well as leaf springs------ coupled with the shoddy work of their own craftsmen, the Tatar bandit group also built a fleet of military four-wheeled/large carriages, some of which were also equipped with heavy armor.

In the capital, with the exception of a few nobles, most of the nobles preferred to ride in horse-drawn carriages that could avoid the wind and snow.

More than 200,000 horses, a large area of black pressure, pressed towards the position of the Liuqiu guards.

The people who walked in front of the team had already dried their tears, and those who were weak and could not keep up had already been killed, and the rest were all insensitive.

Captain Bao Wei sat in front, and he also received military information from the Tatar bandits early.

He discussed a countermeasure with his brothers, and decided to abandon the use of mine tactics first------ although the base camp of Liuqiu Island had already sent new mines, which did not need to be pulled, and could be directly pressed.

The Tatar bandits' despicable and shameless tactics of bringing civilians into battle completely rendered their mine tactics completely ineffective.

But Captain Bao Wei is not afraid, they still have the new weapons sent by Zhang Island Master.

Among them are the rocket weapons they are most familiar with, nalot/gasoline rockets and picric acid rockets!

Coagulation/gasoline is very simple, as long as fatty phosphoric acid is added, Zhang Daozhu did not add other heating agents, with the level of force in this era, it is enough.

When it was sent for test firing, its effect made Captain Bowie stunned!

They were test-fired on the beach, and the fire at the point of impact lasted so long that even the reef was shattered-------

Picric acid is an explosive taken out by Zhang Daozhu after nitrate/glycerol explosives, thunder/mercury and cotton propellants.

Once he had amassed enough coal tar, he used a laboratory method to extract it himself.

He added a NaOH solution to the coal tar so that phenol and sodium hydroxide reacted to produce sodium phenol dissolved in water.

Coal tar itself is insoluble in water, and sodium phenol can be separated by separating the liquid.

At this time, hydrochloric acid is added to the liquid after separation, hydrochloric acid can react with sodium phenol to form phenol, phenol is slightly soluble in water, and the rest can be separated by separating phenol again, and it can be dried after drying.

The process is relatively simple and easy to succeed, but it is more cumbersome to achieve semi-industrialization.

Later, after the research of the two people, a set of related equipment and processes were designed, so that the yield of phenol gradually increased.

There are two main processes in the preparation of picric acid, sulfonation and nitration.

Phenol is easy to be oxidized, and when it encounters dilute nitric acid, it will produce red and black products and be scrapped.

Therefore, Zhang Daozhu must first react with concentrated sulfuric acid to form a relatively stable sulfonic acid compound, and then react with nitric acid to replace the sulfonic acid group with nitro.

The last process is to passivate with cebate wax, that is, you can get practical high-quality explosives/drugs!

Picric acid is highly corrosive to metal, but does not react with tin and aluminum.

Zhang Daozhu plated the inside of the combat part of the rocket with a tin layer, and also coated the surface of the soil acid column with a tung oil layer, so that the double insurance can effectively prevent the occurrence of corrosion.

At the same time, he doped the black powder engine with 5 percent picric acid, which could effectively increase the propulsion of the gunpowder engine.

Of course, they also made some changes to the shape of the rocket to make it more aerodynamic------ still maintaining the original collision mine/mercury fuse.

The whole rocket looks much smaller than in the past------ but test firing showed that the range of this rocket can reach fifteen kilometers, which is much farther than in the past!

At the same time, its explosive power is amazing.

Although it is still a ten-kilogram cartridge, its explosive power is dozens of times that of black powder!

Wang Defa's family also improved the rocket launch equipment, changing the original scattered single-engine architecture to a parallel nine-tube type, which was started by electric fire.

In this way, two four-wheeled/horse-drawn wagons, one pulling nine-barreled launch equipment and batteries, and one pulling rockets and other supplies, can form a rocket squad that------- combined with napalm incendiary bombs, can eliminate an active organism within a square kilometer in a matter of minutes!

Picric acid is extremely useful and is an important chemical product for the current Zhangdao owner.

Picric acid is a yellow crystalline powder, which can not only be used as a strong explosive, medicine and strong oxidizing agent for making rocket fuel, but also in matches, leather treatments, metal engraving and other industries, it can also be used as a dye for textiles or a raw material for glass coloring.

The yellow color dyed by it is a beautiful bright yellow.

However, due to the war, all the output can only be used on the battlefield first.