When the people in the tent heard this, they were convinced. They came to Nanchang to share a share of the military exploits, but they didn't want their people to lose in the siege, so they waited for half a year and a year, and it was best to drag down Nanchang City.

"Yang Butang's plan is very good!" Cao Zhijian was the first to praise it.

"A soldier who surrenders without a fight, Yang Butang is clever."

"Just besiege but not attack, and see how much food he Jin Shenghuan has!"

"Yes!"

Su Chengyu frowned and remained silent. Only he knew that Daming couldn't afford it at all now, and a huge catastrophe was about to come, so where would he have time to wait here for Nanchang City to surrender when all the food was gone.

According to his memory, the main force of the Qing army's vanguard should have gone south at this time, and he also brought a large number of "Qing Cooperative Army" to the Qing Dynasty, and the total number may be as many as seventy or eighty thousand! And its target was Fujian, the capital of the Longwu Dynasty.

In history, the Qing army broke through Zhejiang in June of the second year of Longwu, and invaded Fujian in August, and Longwu was killed.

Nanchang must be resolved as soon as possible, and then Longwu can be taken to Jiangxi in case of accidents. In addition, it is now necessary to reorganize the armed forces as soon as possible, and not let a large number of troops be dragged down by the Nanchang side.

Su Chengyu glanced at the generals present, the Ming army under Nanchang City seemed to have a lot of people, but more than half of them came to join in the fun, once the situation was abnormal, they couldn't be relied on at all.

In the historical Ganzhou defensive battle, Yang Tinglin also gathered 40,000 troops, but when the Qing army attacked the city, only the 6,000 men and horses in his hands were holding on to the city, and the others either fled or watched from afar.

When Ganzhou City fell, reinforcements from all walks of life immediately dispersed, especially He Tengjiao and Ding Kuichu's people ran the fastest. It is conceivable that when the main force of the Qing army attacks Fujian, if Nanchang City has not been taken, there may not be much left of the 40,000 army at present.

Thinking of this, Su Chengyu blurted out: "There are only more than four months left, and the battle of Nanchang cannot be delayed for a long time, so it should be resolved quickly!" ”

Everyone in the tent was stunned.

Wan Yuan Ji was puzzled: "Your Highness, what is only more than four months left?" ”

Su Chengyu was a little embarrassed, I can't say that I pinched my fingers, and Jianyu was going to attack Fujing in four months, right? Others don't believe it's still light, and it can't stand it if you put him on a hat that curses the fortune of the country.

"Ahem, this, the main force of Jianyu has recently left Beijing." Su Chengyu tried to use normal logic, "According to the marching speed of the Qing army, they can reach the Huizhou area in four months at most." At that time, if the soldiers invade Guangxin, there will be a big battle in the northeast of Jiangxi.

"Besides, it is still a question whether King Lu's side can withstand it. In case its Qiantang defense line is breached, the captive army can go all the way south, and the situation in Fujing is critical. ”

Hearing this, Yang Tinglin immediately nodded and said, "There is indeed an urgent report this morning, saying that the Jianyu Boluo Department is heading south. His Royal Highness the King of Chenzhou is really worried. ”

Su Chengyu only remembered that the person who killed Longwu in history was the rebel general Li Chengdong, but he forgot who the commander of the Qing army's attack on Fujian was, and only then did he know that it was Boluo.

He still had some impressions of this person, and Bolo was involved in the two battles that decided the life and death of the Ming Dynasty before Jianyu entered the customs - the battle of Ningyuan and Jinzhou. In the two battles, he repelled the main forces of the Ming army led by Zu Dashou and Hong Chengchou respectively, and was one of the main culprits in the invasion of hundreds of miles of territory outside the Ming Pass.

After the Qing army entered the customs, Bolo captured Henan, Shaanxi and other places with Duoduo, and was an important general for the Qing army to defeat Li Zicheng. Admittedly, this is indeed an extremely difficult guy to deal with.

Su Chengyu immediately said: "It's best to capture Nanchang within a month." In this way, people from all walks of life can repair for a period of time, and then gather Guangxin to calmly arrange the defense line to wait for work. ”

As soon as the words fell, Su Guansheng was heard: "His Royal Highness the King of Chenzhou said this is wrong. ”

He lost a lot of people in Fuzhou last time, and he has been eager to find an opportunity to show that he is actually very talented in military affairs.

"Sun Tzu's Art of War: 'Go up to the army to plot, and attack the city.'" The method of siege is a last resort. He shook his head and said, "And he said, 'Use the law of war, and surround it with ten.'" 'Our army now has only four times the strength of the enemy, and the siege is still insufficient, so how can we blindly attack the city?' ”

Although Wan Yuan Ji was extremely contemptuous of the level of the army commander of the Su University, he nodded at this time and said: "Your Highness, the lower officials have tried to storm it, but Nanchang City is indeed extremely strong, and the thief brigade patrols the city day and night. With our troops, I am afraid it will be difficult to attack in a month. ”

Su Chengyu nodded, he naturally knew how expensive it was to forcibly attack the city in the era of cold weapons, but now is the era when hot weapons are beginning to flourish, and it is natural to use cannons to attack the city.

He said to Yang Tinglin: "Yang Butang, you can mobilize all the heavy artillery in your hands here and blast through the walls of Nanchang, it shouldn't take too long." ”

Yang Tinglin was stunned, and hurriedly said: "Jin Shenghuan, the old thief, sank all the cannons in his hand into the Ganjiang River when he escaped, and Xiaguan is letting people salvage them. At the moment, the only two heavy guns of our army are still on the way, and even if they do, I am afraid that they will not be of great use.

"Nanchang City has been repaired dozens of times before and after, and it is really a strong city. With two artillery bombardments, I don't know what year and month it will take to break the city. ”

Su Chengyu was puzzled: "The Ganzhou Ordnance Bureau already has ready-made cannon casting equipment, and Xu Erlu is also very familiar with the casting process. Now start casting cannons immediately, and you can get more than ten cannons in less than half a month. With these cannons to bombard intensively, I believe that Jin Shenghuan will not last long. ”

"More than ten heavy artillery ......" Yang Tinglin smiled bitterly when he heard this, "Your Highness doesn't know anything, even if you don't say that there are no silver taels for casting cannons in the hands of the lower officials, even if there is, the copper in southern Gannan is not enough." ”

"Not enough copper?" Su Chengyu learned after careful questioning that Yang Tinglin wanted to cast some more cannons for defense when he was guarding the soap mouth, but because China is a country with a great shortage of copper mines, the last time he cast the eight heavy cannons, he had exhausted the copper that the southern Gannan prefectures could receive. If it weren't for poverty, Yang Tinglin would almost have to melt copper coins to cast cannons.

"It doesn't matter, if you don't have copper, you can cast a cannon with iron."

"Iron cannon?" Without waiting for Yang Tinglin to say anything, Zhao Yinxuan hurriedly stopped on the side, "Your Highness, if it is a small cannon of hundreds of catties, it may still be able to be used if the cannon body is thicker." And if these two thousand pounds of heavy artillery are cast with iron, there is a chance that they will be blown up. ”

Su Chengyu shook his head with a smile, he knew that in this era, the mainstream of casting artillery in the world was copper.

Because copper is malleable, it is not easy to break. Limited by the iron-making process, the iron of the cannon often contains a large amount of sulfur, phosphorus and other impurities, resulting in the brittle body of the cannon and easy to burst, so few people are willing to use iron to cast large-caliber artillery.

Of course, there are exceptions, and that is the United Kingdom. Britain has high-quality iron ore, plus they have the most advanced reverberatory furnace refining method of this era, so the quality of the iron cannons cast is not bad. However, due to the complexity of the process, the cost of British cast iron cannons was higher than that of copper cannons.