No matter how much Tamina of Tus City had a leading role, it was impossible to prevent Pan Xiaogu from leading a large army into Persia.

After three days of repairs in Xiyue Harbor, Pan Xiaogu set off with a thousand cavalry as the vanguard.

The army traveled by land, and it took only one day for one man and two horses to arrive at the camp of Taniguchi, located on the eastern side of Jieshan, where they would repair for the night, and tomorrow morning they would climb over a mountain beam and enter the valley of Jieshan River.

This camp was originally prepared for the workers of the river dredging project, but at this time, the project had not yet begun, and there were not many workers in the camp, so it was just a temporary foothold for the army.

In the camp, Pan Xiaogu met with the person in charge of the river dredging project and inquired about the preparation of the project.

This person is a disciple of Mo Lao, and he is also a master builder whose ability level has reached a high level, so Pan Xiaogu's attitude towards him is more respectful.

Pan Xiaogu is very concerned about the progress of the river dredging project, and after the waterway is opened, it can greatly reduce the logistical pressure of the expeditionary force.

Mo Lao had already estimated that without a year and a half, it would be impossible to completely dredge the river.

However, recently, Pan Xiaogu had some new ideas, and felt that he could speed up the progress of the project, so he discussed it with Mo Lao.

Mo Lao also felt that these ideas were indeed helpful in speeding up the project, but what the specific effect was, he had to let Pan Xiaogu test it with Zhao Dajiang, who was in charge of the project.

"This is gunpowder from the Central Plains, I wonder if Master Zhao has heard of it?" Among the firearms sent by the Cheng family, there is also some spare gunpowder, adding up to two or three hundred kilograms, Pan Xiaogu does not look down on the performance of these primitive firearms, and intends to use them as disposable weapons, and these spare gunpowder can just be used to clean up the reefs in the river.

"Gunpowder? Zhao has never heard of it, and I don't know what disease this medicine treats? Master Zhao looked at Pan Xiaogu with a puzzled expression.

"Gunpowder is not used to cure diseases, but to open mountains and split rocks... Well, it's not clear just to say, the master craftsman comes with me. Pan Xiaogu dragged Master Zhao to an open space outside the camp, where his own soldiers had already prepared an experimental field.

In the center of the clearing is a large rock, but this stone has a 'tail' growing on it. Master Zhao took a closer look, only to find that a hole had been punched in the middle of the stone, and the hole was sealed with mud, and this 'tail' was inserted in the mud, which was rubbed out of straw paper.

After Pan Xiaogu took Master Zhao to see the stone, he pulled him to hide behind the bunker, and then gave orders to his own soldiers.

"Ignition!"

There was a loud bang... It's impossible, it's just black powder, not nitroglycerin, and it's not the 'gray powder' produced by later generations, the power is not so exaggerated, but there is still a loud bang.

After the noise and smoke cleared, the big stone in the middle of the clearing had become fragmented.

"It's... This..."Master Zhao's reaction was simply the same as his master's.

"Master Zhao, this is gunpowder, this is the thing that just blew the stone apart." Pan Xiaogu took a small cloth bag from his own soldiers, which contained about one or two black powder, which was about the same amount as the charge of the blasted stone before.

Zhao Dajiang first reflexively dodged, but soon took the gunpowder curiously and looked at it carefully, but he still looked cautious and threw it away when he saw that the situation was not good.

"Master Zhao, don't worry too much, as long as this gunpowder is not in a sealed space, the danger is not so great."

Pan Xiaogu asked him to pour some gunpowder on the ground, and then pulled him back two steps and asked his soldiers to light the pile of gunpowder.

This time, the gunpowder did not explode, but burned violently.

"Huh?" Master Zhao was curious and hid on the ground to check the residue left behind after the gunpowder burned, and Pan Xiaogu asked him on the side

"Master Zhao, this gunpowder is helpful for the project?"

"Yes, yes, it helps a lot." Zhao Dajiang originally planned to use the method of thermal expansion and cold contraction to clean up the reef on the water surface little by little, but as for the underwater, it could only be dug by hand little by little.

"I don't know how much this thing is worth, how much is it?" Zhao Dajiang is worthy of being a senior craftsman, and he quickly thought of the key points.

"Gunpowder is not expensive, but the quantity is not much at present, only about two or three hundred kilograms, and it will take at least one or two to blow up a stone that is just that big."

Zhao Dajiang showed a look of disappointment on his face, this bit of gunpowder did not seem to help the progress of the project much.

Pan Xiaogu saw him like this, and said with relief

"Don't worry, I have already purchased the raw materials for making gunpowder from the Cheng family, and we will probably be able to produce gunpowder ourselves after the spring of next year. And this time I didn't just bring gunpowder. ”

How could Pan Xiaogu not know about the problem of insufficient gunpowder, of course, it was impossible to put the treasure on gunpowder.

Pan Xiaogu's second killer feature is a new inheritor Qi practitioner!

At the beginning, Pan Xiaogu was very disappointed in these qi practitioners, why?

Because through training, Pan Xiaogu found that the combat effectiveness of these qi practitioners was very bad, and the gap was too big compared to other inheritors in the same realm.

Among the five basic spells that the Qi Practitioner initially comprehended, only the Fire Movement and the Golden Movement Spell are combat spells, but among the first batch of Qi Practitioners, the people who have mastered these two lines of spells are the least, but the people who have mastered the Earth Movement Spell [Longtu Mantra] are the most, I don't know if it is related to the fact that most of these people are from farming.

Originally, Pan Xiaogu planned to organize these people into an engineer unit, and then when he went to the barracks to inspect it, he accidentally found that the soil dragon raised by the earth mantra could be superimposed repeatedly, and after many spells, the half-human height soil dragon could be accumulated into a zhang of earth wall, of course, it was okay to continue to increase the height, but the mound raised by the spell grew from the foot up, and the greater the weight on the top, the slower the growth.

In short, the basic spell of [Longtu Mantra] is simply a weapon for building cities, a qi practitioner can create a ten-meter-long, two-three-meter-high earth slope after repeatedly casting spells for a whole day, as long as it is lightly trimmed and tamped, it is a simple city wall.

Aroused by interest, Pan Xiaogu pulled the qi practitioners to do many experiments, and discovered many characteristics of the [Longtu Mantra].

For example, when casting the [Soil Boom Spell], Qi Practitioners can perform simple control to make the bulging earth dragon form some less complex shapes, and the control ability will become more and more handy as their mastery of spells deepens.

Another discovery is that this earth boom spell can be cast in water, which can build a dam directly in the water, but it is less effective than on the shore, and if the current is too fast, the uplifted earth dragon may be washed away by the current.

But none of this matters, because the [Longtu Mantra] cast by different people can also be superimposed, as long as you concentrate multiple people to cast the Longtu Mantra, it seems that you can build a cofferdam in the water, isolate the reef in the water, drain the surrounding water, you must know that cleaning the river, the most troublesome thing is the part of the reef located in the water...