After the replacement of the imperial artillery, Zhu Youxiao was ready to dispose of the eliminated artillery to Yan Siqi at one time.

"Your Majesty said that the Imperial Bank can provide a loan, and the interest is only one and a half cents, and it can be repaid in ten years, and only one percent can be repaid every year." Xu Xinsu said.

"I think it's okay, after we occupy Kyushu, the first thing we have to consider is how to hold Kyushu, the inland cities are fine, but the coastal cities can't be without artillery, we can't dismantle the artillery on the warship." Zheng Zhilong said.

"Okay, I agreed." Zheng Zhilong nodded.

"Well, I'll discuss this matter with Your Majesty when I go back." Xu Xinsu said.

"I'll send someone with you, too." Yan Siqi said.

Xu Xinsu paused for a moment, and immediately said, "This is very good." ”

"It's not that I don't believe you, after all, this is a business of nearly 10 million taels, and I have to give an explanation to my brothers." Yan Siqi explained.

"I understand that it is best for the eldest brother to send people, and I can also give an explanation to the brothers." Xu Xinsu said with a smile.

"Brother Xu, I'll take you to see the goods this time, it's better than ever." Zheng Zhilong said when he saw this.

"Exactly, I want to see it too." Xu Xinsu nodded.

"Is there such a big demand for Ming slave girls? I've heard that you've sold hundreds of thousands of slave girls. Zheng Zhilong asked.

"There must be a big demand, and if there are millions of slave girls, I can sell them." Xu Xinsu said.

"How about you say I'm going to the empire to open a green house?" Zheng Zhilong asked.

Xu Xinsu glanced at Zheng Zhilong and said, "Of course it's good, this is also a business that makes money every day, but the eldest brother is going to be the king, and it's not good to do this now!" ”

"There's no way to do it now, this war is too expensive, and if you don't want to find a way, this battle really can't be fought." Zheng Zhilong said.

"Actually, I've had such an idea for a long time, but the court doesn't allow me to engage in this business, and I can't help it." Xu Xinsu said helplessly.

"We are different, Your Majesty supports us so much, you will definitely agree." Zheng Zhilong said with a smile.

"This is also, if the imperial court can agree to your request, it is better for us to partner, now the empire is popular for chains, and we will also make a chain of green buildings, it is inconvenient for you to come forward, then I will come forward, and I will come out with the required funds, as for how to distribute the specific benefits, when the time comes, when His Majesty agrees, we will distribute it again, how about it?" Xu Xinsu said happily.

"Well, we'll discuss this matter after our people meet His Majesty." Zheng Zhilong said.

……

Three days later, Yan Siqi's army launched a second round of military operations, and by mid-March, all parts of Kyushu were occupied by Yan Siqi's army, except for Amakusa Shiro's territory.

In late March, negotiations between Yan Siqi and Amakusa Shiro also broke down, and on March 25, Wang Yingshen led an army of 50,000 into Imari Castle. And Imari City has nearly 20,000 defenders. At the same time, Zheng Zhilong led 10,000 sailors to approach Nagasaki.

On March 26, the king should besiege Imari Castle and send envoys to persuade him to surrender, but the defenders of Imari Castle refused to surrender.

In the early morning of the 27th, Wang Yingshen launched a strong attack on Imari City. Although Imari Castle was a small town, it was the only way for the Satsuma clan to attack Shimabara by land. In order to prevent the invasion of the Satsuma Domain's army, Amakusa Shiro hoarded 20,000 troops in Imari Castle.

Although Imari City also has a small number of medium barrels (artillery, which can fire about forty grams of ammunition), and Wang Yingxian does not carry heavy artillery, but in terms of quantity, power and range, the artillery of Imari City cannot compete with Wang Yingxian's artillery at all.

Under Wang Yingshen's fierce artillery bombardment, Imari City was broken in just two days. After Imari City was breached, Wang Yingxian's army slaughtered for three days and slaughtered Imari Castle to the ground.

Compared with Wang Yingshen, Zheng Zhilong's army was much smoother, Nagasaki surrendered without a fight, and Zheng Zhilong occupied Nagasaki without a single soldier.

On March 30, after Wang Yingshen and Zheng Zhilong converged, they once again divided their troops into two ways to besiege Daoyuan City. Shimabara Castle is much stronger than Imari Castle, which is a rectangular renguo-style flat castle characterized by its tall and sturdy stone walls, and Mizubori surrounds the Honmaru and is connected by a wooden bridge in the form of a Ninomaru and a corridor. Moreover, the defenders of Shimabara Castle are very tenacious, which is why Itakura Shigemasa has never been able to conquer Shimabara Castle?

The way the Satsuma clan besieged the castle was influenced by the Ming Dynasty, and artillery was always used in the initial siege. And this time, with the heavy artillery assistance of the naval division, the artillery fire of the Satsuma Domain became even more intense.

Under the heavy artillery bombardment of the Satsuma Domain, fires broke out in many places in Shimabara Castle.

"Ijiin, you lead 10,000 soldiers and horses to attack the city from the east." Zheng Zhilong saw that there were fires in many places in the city, and he immediately ordered.

"No." Ijiin Tadahisa Shiri.

The attack from the east led by Ijiin Tadahisa did not go well, although under the heavy artillery fire of the Satsuma Domain, Shimabara Castle suffered heavy losses, but the will of the defenders of Shimabara Castle was very tenacious, and Ijiin Tadahisa's several attacks were repulsed by the defenders, and at the end of the day, Ijiin Tadahisa's 10,000 troops were killed and wounded more than 2,000 people.

"It seems that the capture of Shimabara is more difficult than we thought." Zheng Zhilong said.

"Do you want to use Matsudaira Nobutsuna's method to surround Amakusa Shiro?" Wang Yingshen sighed.

"According to the spies, the food in Shimabara Castle is enough to last for three months, and the siege is not an option at all." Zheng Zhilong retorted.

"My lord, please allow me to lead the troops to attack the city again tomorrow, and within three days, I will definitely take Shimabara Castle." Ijiin Tadahisa pleaded.

"Ijiin-kun is so dedicated, how can I not agree? Do you need any support? Zheng Zhilong asked.

"Grenades, I need an adult to give me a batch of grenades, as well as artillery support." Tadahisa Ijiin said.

"I'll send you a batch of grenades tonight. As for artillery support, you can always ask for it. Zheng Zhilong nodded.

"Thank you, sir!"

……

The next day, Zheng Zhilong bombarded another wave with artillery, and then Ijiin Tadahisa began to attack the city. This time, Ijiin Tadahisa personally led the law enforcement army to supervise the battle, and those who did not retreat were immediately beheaded. And the grenade also played a huge role, although the power of the grenade is not large, but the lethality in a narrow range is still very considerable, relying on the power of the grenade, the army of Ijiin Tadahisa finally attacked Ninomaru after paying a heavy price.

When Amakusa Shiro saw that the army of the Satsuma clan had invaded Ninomaru, he immediately set fire to the wooden bridge between Honmaru and Ninomaru. After the wooden bridge was burned, Honmaru was completely isolated.