My reborn husband and son are thinking about how to kill me every day.

Although everyone had their own thoughts and considered many things, it was only for a moment. Soon, everyone's thoughts returned to the blazing oil tank.

Xie Liang spoke first: "What kind of oil is used in this fierce fire oil tank?"

Considering that oil had not yet been discovered in this era, Ji Yunshuang did not mention oil for the time being, but said: "Tung oil and tea oil should be fine, but it would be better if we could find other alternatives."

Fu Ci asked with great interest, "What other oil can be used as a substitute?"

He had a feeling that she must already know which oil could be used as a substitute.

Ji Yunshuang wasn't worried about being too sharp and bringing danger upon herself. She firmly believed that as long as she was strong enough, others would have to think twice before acting, no matter what they wanted.

Moreover, given the current situation, the stronger she is and the more she knows, the more they will value her and the more inseparable they will be from her.

Therefore, she did not hide the matter of oil and said frankly, "I have heard of a kind of oil that is buried deep underground."

This oil is extremely potent; once it starts burning, it's very difficult to extinguish. I believe that if we could find this oil and incorporate it into this weapon, its power would be greatly enhanced.

Fu Ci recalled the descriptions given by the soldiers when Ji Yunshuang returned from the battle with the Qi army and asked, "Was this the same kind of oil used in the battle at Hanfeng Pass?"

Ji Yunshuang shook her head and said, "No, the combustion accelerant I used in the previous battle with the Qi army was something I developed myself."

Before the apocalypse, she stored a lot of gasoline, diesel and other fuels in her space.

During the battle with the Qi army, she added gasoline as a combustion aid.

However, gasoline and diesel are both separated from petroleum. In this era, even if petroleum were found, the technology of this time might not be able to separate it.

So she had no choice but to shamelessly say that she had researched it herself.

After saying that, she added that the method for developing this combustion aid was difficult and very unstable, and she was not sure if she could make it again next time, so she could not teach the method to others for the time being.

Whether it was truly difficult to make or she simply didn't want to share the recipe with them, Fu Ci wisely refrained from asking further questions.

Instead, he asked Ji Yunshuang about the kind of oil buried deep underground, whether there were any tricks to finding it, and where to start if he wanted to find it.

"I heard that the method is very complicated, and I don't know if it will work. The key is that it can't be explained in just a few words."

Ji Yunshuang said, "We'll discuss this in detail later. Since you're here, let's go take a look at another weapon."

Fu Ci and Xie Liang exclaimed in surprise at the same time, "You've created another weapon?"

It wasn't that the two were unsophisticated; it was simply that this hastily formed weapons bureau had only been established for a short time. How could it have produced two decent weapons so quickly?

This efficiency is simply too fast.

Even with the imperial court's orthodox weapons bureau, with so many officials there, over the years, they haven't managed to produce many decent new weapons.

Their small weapons bureau, apart from Old Qiu, was just a makeshift team assembled on the spot, which was quite shocking.

Ji Yunshuang said, "Yes, this is a crossbow. I named it the 'Jue Zhang Crossbow.' It can be learned to use in just three to five days. If it can be manufactured, we can quickly form a shooting team."

Fu Ci and Xie Liang, master and apprentice, almost couldn't help but exclaim in amazement again, completely unaccustomed to such things.

Honestly, they never even dared to dream of teaching an ordinary person to archery in three to five days and then forming a shooting team.

If the effects Ji Yunshuang described are truly as good, then their army will be dozens of times stronger than before.

The two said no more and quickly went with Ji Yunshuang to see the crossbow she had mentioned.

Lu Wuzheng had made two crossbows at home, and the new crossbow he was making was the third one he had ever made.

He was naturally talented in this area, and with several productions under his belt, he gained considerable experience.

This crossbow can be described as perfectly made.

Fu Ci fell in love with the crossbow the moment he got his hands on it. This crossbow could not only fire three arrows at once, but also had a longer range than ordinary bows and arrows.

The key point is that, just as Ji Yunshuang said, this crossbow is extremely easy to use.

He looked at Ji Yunshuang and said, "Junior Sister, you are truly a great hero of our dynasty. Just tell me what reward you want this time."

“This is not my achievement.” Ji Yunshuang looked at Lu Wuzheng and Wang Erniu beside her and said, “Without them, this crossbow could not have been made.”

“They should also be rewarded! Each of them should be given fifty taels of silver and thirty bolts of brocade.”

Although he rewarded the two of them, Fu Ci believed that the person who could design the crossbow must be the mysterious junior sister in front of him.

Since Ji Yunshuang had declined earlier, he didn't ask her for any reward. In any case, based on his understanding, she certainly wouldn't wrong herself.

He started by getting down to business, asking how many crossbows could be made in a day.

Ji Yunshuang's goal was also to mass-produce crossbows, so she didn't hesitate to ask for people and materials.

Since the matter was of great importance, Fu Ci did not hesitate and instructed his close guards to write down what Ji Yunshuang wanted and to prepare it immediately.

There was also silver money awarded to Lu Wuzheng and Wang Erniu.

Lu Wuzheng and Wang Erniu were stunned. It took them a long time to react. After kneeling down and kowtowing in gratitude, they asked in a low voice if they could have someone deliver the gifts to their homes.

When Fu Ci learned that they wanted to give the gifts to their families, he simply ordered his personal guards to go back and prepare materials for making crossbows, and also arranged for someone to deliver the gifts to the two men's homes.

In Shuanghe Village, after the start of the new year, every household began preparing for spring planting.

This year is different from previous years. Most families in the village have two men serving in the military, which has significantly reduced the number of able-bodied men in the household.

Many people looked worried.

This was partly due to a shortage of labor in the household, and partly due to concerns about the safety of family members.

Compared to the villagers who were full of sorrow, the Lu family members looked much better.

A few days ago, Tianrui brought back replies from Ji Yunshuang and Lu Yinheng.

Knowing that Lu Yinheng and Lu Wuzheng were safe in the military, their families were much more at ease.

Holding her mother's reply and the newly delivered milk tablets, Lu Yuzhu cried less often than before.

Now, whenever she misses her mother, she takes out the letter her mother wrote back to her and looks at it, then eats a milk tablet.

In her reply, her mother said that if she missed her, she could eat a milk tablet.

There are many kinds of milk tablets, and she can eat as many as she wants, unlike candy where there are quantity restrictions.

Moreover, Ji Yunshuang also said in the letter that she would send her many more next time.

Only Lu Yanqi often frowned.

Looking at the letters his father sent back, he always had a feeling that the woman was in the army, with his father.

He deeply regretted not telling his father about his rebirth before he went to the army.

If he confesses, he can talk to him about that woman.