"Brother Shen, you just said that there is a saltpeter mine near the border pass?" Xie Yangui sat aside and listened carefully to what Shen Huaiyi said, and suddenly she caught something, so she asked.

"Saltpeter Mine? Yes, it's just outside the city, and if you want to see it, I can take you there right now, and it won't take long." Shen Huai was also stunned and immediately responded.

"Okay, then we'll go now." Xie Yangui stood up and walked towards the outside of the study, and Shen Huai hurriedly followed.

"Let Yushu come to me." After instructing the guards in the mansion, Xie Yangui turned his head to look at Shen Huaiyi, "Is Brother Shen riding?"

Seeing Shen Huaiyi nodding, Xie Yangui whistled loudly at the backyard.

Jing Yu, who was in the backyard, heard the whistle and walked towards the gate of the front yard, and Yushu, who got the news, also came to Xie Yangui's side.

"Put on a thick cloak, let's go out of town." Xie Yangui believed what Shen Huai also said, there was a saltpeter mine outside the city.

She didn't know it, but she vaguely remembered mentioning saltpeter when she used to read books.

If this thing is used well, it can be earth-shattering.

Yu Shu agreed, took a thick cloak, and she rode a horse with Xie Yangui, and Shen Huai also took her out of the city.

According to what Shen Huaiyi said, after leaving the city, it doesn't even take the time of a cup of tea to arrive.

After a while, it arrived.

"This is not far from the place where Uncle Hu's bones are buried." Sitting on horseback, Xie Yangui looked around and said with a smile.

Yu Shu jumped off the horse, she immediately followed, Shen Huai also led the way in front, and the three of them came to the saltpeter mine together.

There are not many people who know about the mines here, so they have never sent people to guard them.

Xie Yangui took out a night pearl from his arms to illuminate it, because it was given to her by Anyang, so she could stay by her side all the time.

She turned her head to look at Yushu and instructed her, "Go and see if it's the saltpeter you mentioned to me before?"

"Saltpeter?" Yushu was a little surprised, there were some traces of mining in the mine.

Shen Huai, who was on the side, also explained that when it was first discovered, in order to determine what kind of vein it was, there were traces.

In Qiannan, saltpeter mines are not as good as others, so even if people know about it, no one will come to mine it.

Yushu picked up a few pieces of ore from the ground, and the three of them came out of the cave so that she could easily check them.

"Girl, this is indeed saltpeter." After confirming, Yushu immediately understood what Xie Yangui meant.

As a doctor, she usually reads various medical books when she is idle.

Many of the medical books in Yushu were found for her by Xie Yangui with great effort, and many of them were precious ancient books.

The account of saltpeter was in an ancient book, but it was different from the books she usually read

It's not so much a medical book as a miscellaneous book, with a bunch of bizarre methods on it, which is more interesting than fun, so she reads them all.

In the past, when she was reading, she would occasionally read it to Xie Yangui.

Xie Yangui forgot most of the content after hearing it, after all, the medical book was very boring, and Yushu didn't expect her to remember this paragraph.

"Do you remember the passage about saltpeter?" Xie Yangui asked.

"I don't remember exactly, but don't worry, girl, it just so happened that the book was pressing under my medicine box."

Because it was a miscellaneous book, and it was interesting enough, it was still an ancient book, so after reading it at that time, Yushu was specially preserved and pressed to the bottom of the medicine box.

I thought I'd flip through a few pages when I had time, but then I was busy with a lot of things, so I didn't bother with it.

She vaguely remembered that after making saltpeter, she could even burn down the house if she burned it with other things.

But what exactly is the recipe, I'm afraid you have to try it slowly after reading the book.

"Then bring some back to study." Xie Yangui commanded.

"I'll go in and get it, how much do I need?" Shen Huai also stood aside, understood the conversation between the master and servant, and asked Yushu.

Yushu thought about it, gestured a few times with his hand, and deliberately

After a few words, Shen Huai also entered the mine, and brought out the required saltpeter in a short time.

The three of them soon returned to the city, studied and pondered the matter, and handed over the letter.

Shen Huaiyi's harvest today is not bad, and he made an appointment with Xie Yangui to come back tomorrow.

In the evening, Xie Yangui had a farewell meal with Anyang, and tomorrow, Anyang will leave for him.

It's night.

The soldiers stationed at the city gate strictly implemented Xie Yangui's military orders, and did not dare to slack off.

Although Rong Di knew that there was a female general with outstanding skills in the city, and she had suffered losses before, she did not get rid of her contempt.

After all, they now have an army of more than 200,000 people.

Rong Di's soldiers and Burmese soldiers wanted to sneak attack at night, but before they could get closer, they were discovered by the soldiers in the border pass.

When Xie Yangui got the news, she had just laid down, and she immediately dressed up and came to the city gate with Jing Yu.

"Don't worry, general, the dogs who wanted to sneak up on the night have already retreated." The lieutenant general stationed there saw Xie Yangui and saluted her.

"Looks like they're going to be able to hold it back." It was late at night, and it was pitch black outside the city, and nothing could be seen clearly.

But it is certain that the enemy outside the city has now retreated.

In addition to the military order, Xie Yan also made some arrangements to prevent this kind of sneak attack at night.

It is expected that after dawn, there should be some corpses of enemies outside the city.

She deliberately explained a few more words, and simply did not return to her residence, but rested in the camp under the city.

In this way, it is also convenient for her to know whether the rest environment of the soldiers is arranged according to her instructions.

When the sky was white, Xie Yangui came out of the tent, and she didn't fall asleep much.

She watched the soldiers change shifts, listened to them explain to each other, and then walked towards the city wall.

Coming to the city walls, she looked out of the bunker and down through the bunker.

On that day, the Rongdi people came outside the city to shout and curse, and she once stood on the city wall in red clothes, and shot and killed many of the leaders and soldiers who brought people to the city to scold.

At that time, she would be like this because the Rong Di people, who were determined to scold the formation, did not have the weapons to take advantage of her cold arrows.

At that time, she was prepared.

Now that so much time has passed, there is no guarantee that the enemy army will not be prepared, so it is prudent to be cautious.

Sure enough, there were some corpses left outside the city, and looking at the dress, it was indeed not just Rong Di's soldiers.

Xie Yangui retracted her gaze and looked into the distance, wondering if the people she sent out would be able to return today?

After standing on the city wall for a while, she gave an order and ordered the corpse below to be disposed of as soon as possible.

The Rong Di people are cunning, and Xie Yangui does not dare to guarantee that the bodies of those soldiers are clean, so the soldiers who go out of the city to collect the corpses will go out of the city fully armed according to her instructions.

After disposing of the corpse outside the city, it will be very safe to return to the city.

It wasn't until he saw that they were all dealt with that Xie Yangui came down from the city wall and headed towards his residence.

She promised Anyang last night that she would personally send her to the city gate.