The excited Nu Chief thought that it was the Heavenly Blessing Great Golden Country, and named the newly cast cannon "Heavenly Blessing Cheering General".

Within a few days, he set up a new battalion outside the Eight Banners Army, "Wuzhen Chaoha", which translates into Chinese as "heavy army", and the vast majority of this army was composed of Ming troops who had captured or voluntarily surrendered to Jiannu, and there were many bird gunners and gunners.

The Red Gangster appointed the great traitor Tong Yangxing as the chief military officer and Cao Zhenyan as the instructor, and the "Wuzhen Chaoha" completely imitated the artillery tactics of the Ming army and the three-stage bird-striking platoon for training.

Due to the cruel military discipline of the Houjin army, the combat effectiveness of the trained "Wuzhen Chaoha" was comparable to that of the Ming army with the same number and equipment.

What kind of people bring what kind of soldiers is like this, too many Ming troops who were captured by Jiannu joined the Houjin army, and their combat effectiveness skyrocketed.

In history, when Wu Sangui, Kong Youde, Geng Zhongming, and Shang Kexi's subordinates worked for the Ming Dynasty, they always lost the battle and always chose to escape.

However, after recognizing the master of Jiannu, after following the Houjin army into the customs, they all became the vanguard and pawn of Jiannu, and these traitor troops participated in every tragic massacre.

The Red Gangsters believed that Dajin had artillery and artillery, and the Dajin Army's ability to attack fortifications would be greatly improved, and they were no longer afraid of the Ming Army holding on to the city.

Indeed, since the fourth year of Chongzhen, the Houjin army really dared to fight the urban offensive and defensive battles, and the next battle of the Daling River, the commander of the Ming army, Zhang Chun, suffered the loss of the barbarians and the artillery fire, and was blasted through the car formation, resulting in a rout.

After 1631, Jin Zhu's ability to build the Hongyi cannon was a major event clearly recorded in the annals of history, and Huang Han certainly knew it, so he was not idle when he was in Beijing at the end of last year.

Sun Yuanhua became the governor of Denglai, the official of the feudal territory, and of course it was impossible to personally participate in the casting of cannons as he did when he served in the Ministry of Industry.

The imperial court gave preferential treatment to scholars, but never gave preferential treatment to skilled workers, and those craftsmen who used to follow Sun Yuanhua to cast Hongyi cannons are still living in Beijing.

Huang Han knew that there were a lot of master craftsmen in Jingshi who had the technology of casting cannons and making guns, and the imperial court did not pay too much attention to these people at all, so he used Xu Guangqi's connections to directly ask for dozens of households to send the "Tiger's Den" city before the New Year.

These master craftsmen have been secretly verified by the "flag guards", and without exception they are all masters with exquisite skills, and Huang Han's acquisition of these people means that the "Red Flag Army", the highest cannon casting technology of the Ming Dynasty, is about to have.

At this time and then, Huang Han had the "Tiger's Den" city as a base, and he was full of energy.

If you have soldiers in your hands and money and food, when will you not decisively open the gold finger to cast cannons, make guns, and produce glass?

Counting nine cold winters, the factories in the system are operating at full capacity, and there are still job opportunities in the days of this cat winter, and now there are no skilled laborers in steel mills and kilns can get a salary of about one or two silver, and there is no doubt about the enthusiasm.

Huang's steel production is rising, the quality tends to be stable, the management regulations are also keeping pace with the times, spring steel has begun to produce in small quantities, and the research and development of high-hardness drill bits has repeatedly failed and started from scratch.

Houjin and Daming both use the "lost wax method", also known as the "investment mold method" to cast iron cannons, are made of clay molds, this method is time-consuming and laborious, and the yield is very low.

The process adopted by Huang Hankai and the blacksmith master is the hollow casting process for steel molds invented by Major Thomas Rodman of the US Army in the 19th century.

That is, the cannon is cast around the core, and then cooled by running water, which is a method of hardening the inside of the gun chamber first, and the principle is that the outer metal shrinks inward when cooling, and continues to pressurize the hardened inner layer.

The explosive force of the breech propellant cast by this process is absorbed by the entire thick metal layer around the breech, rather than expanding outwards in layers.

In the Ming Dynasty, there were already technical records of iron-core copper casting cannons.

Craftsmen skillfully use the physical properties of copper's melting point of more than 1,000 degrees, which is far lower than the melting point of iron of 1,500 degrees, to mold the iron tire by clay casting method or wax loss method after cooling, and cast the copper wall.

Compared with previous iron or bronze cannons, this new firearm is not only thinner-walled, lighter, less expensive, but also more durable.

The principle of hollow casting process of Huang Hankai gold finger is the same, the method is not difficult to use in the Ming Dynasty, cast iron or cast steel can be, it is nothing more than a bearing container, and the role is to fix the gun mold in addition to the heat dissipation problem, the craftsmen quickly mastered this technology after testing.

The advantage of the steel mold of quartz sand on the inner wall is that it is convenient to integrate and can be recycled, which greatly shortens the casting cycle and saves costs.

The disadvantage of the steel mold is that the heat dissipation is too fast, which makes the molten pig iron have the problem of large supercooling during cooling, the cementite in the molten iron has no time to precipitate, and the graphitization has not had time to proceed, and the graphite has solidified.

Therefore, the cementite in cast iron mainly exists in the form of iron carbide, that is, white iron that is brittle and easy to burst.

Huang Han has already checked the information and knows how to make the iron mold slowly dissipate heat, the method is very simple, burying the iron mold in the hot sand and letting the mold and castings slowly cool with the hot sand to solve this big problem.

It took the Houjin Army half a year to get six Hongyi cannons that could be fired, and after the artillery casting masters of the "Red Banner Army" system completed the theory and practice, they were able to cast 60 smoothbore cannons in a month.

After several months of training, and also because the new recruits were replenished to have a certain foundation, the combat effectiveness of the "Red Banner Army" was greatly improved.

Chongzhen is more concerned about the "Red Flag Army", and wants to know whether the "Red Flag Army" has been full in the past six months, and how much combat effectiveness has been restored?

He sent Shao Xishao, an internal official, to Funingwei to inspect the Yongping reinforcement camp stationed here, and to see the "Red Banner Army" drills with his own eyes.

Huang Han did not hide his strength, and personally led 5,600 soldiers of the "Red Banner Army" to be reviewed, and the soldiers were clearly dressed and armored, and the slogan of loyalty to the monarch and serving the country was shouted loudly.

But the careful Shao Xishao found that the fourteen or fifteen-year-old boy actually accounted for more than half. Because of Fang Zhenghua's relationship, the eunuchs originally had a good impression of Huang Han, and Shao Xishao got a big red envelope with a silver ticket of 1,000 taels, of course he would tell the truth when he saw the emperor.

When Shao Xishao returned to Beijing, he truthfully reported that the "Red Flag Army" had the ambition to serve the country from top to bottom, but it was a pity that the army was still short and children accounted for the majority, and it still needed time to sharpen it, and the gains on the battlefield in the short term outweighed the losses.

The emperor learned that Huang Han worked hard and had a full battalion of soldiers in less than three months after returning to Funing, and of course he knew that there were many new recruits and many children in the "Red Banner Army", and he thought that it would take time to form combat effectiveness.

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