When Qi State was vigorously carrying out infrastructure construction, Yang Hao did not forget the development of the military.

From the moment he discovered Guano Island, Yang Hao guessed that there should be saltpeter in that place, and with the continuous mining of guano Island, things finally made some progress.

In the guano transported back to Chang'an, Yang Hao found what he was looking for.

It's just that these saltpeters are not pure, and it is more accurate to say that they are not so much saltpeter as nitrate.

This congealed lump is buried under a thick layer of guano and slowly forms a white substance on the surface of the rocky soil over time.

Yang Hao knew that this thing should be a stone, because this thing was very similar to the things near the Qi country's toilet, so he was ninety percent sure that he would not admit his mistake.

Although Guano Island is not a natural saltpeter mine, if it is mined properly, the amount of nitrate produced is quite significant.

Although it is not luxurious enough to use it to make ice cubes, it is still possible to get some grenades or other equipment to equip the army, and you can also improve your country's military power.

As for the development of high-end firearms such as muskets and artillery, Yang Hao has little confidence.

Not to mention whether it is possible to make a well-formulated black powder, or smokeless powder, it is simply whimsical to want to elevate civilization into the age of firearms just by scraping this little thing.

Unless Qi Guo is lucky enough to find a natural saltpeter mine, it can support the consumption of firearms.

And now Yang Hao just wants to make the simplest grenade, no matter how powerful the thing is, at least it can be heard on the battlefield, and it is also a good tactical means to scare the opponent's horses.

Imagine that when the enemy's cavalry rushes towards you, a bunch of grenades will fly out from the opposite side, rumbling into a loud bang, whether it can kill the horses or the enemy's riders, or at least frighten the horses who are not trained in this area.

As long as the rhythm of the enemy's attack is disrupted, the enemy's strength will be weakened by at least 30%.

And Yang Hao's imaginary enemy in this regard is the poor clan in the north.

For this clan, Yang Hao always had a bad premonition, although this tribe may be the tribe where Hou Yi is located in the legend, and it can be regarded as a member of Zhuxia.

But now it seems that what these people do after they know how to ride a horse makes Yang Hao subconsciously associate them with the grassland peoples of later generations.

After all, the land of Youyan to the north of the poor clan is Youyan, and the natural environment of this era makes it not very different from the residence of the nomads in later generations.

After the Yanshan Mountains in the north is the Monan grassland in the later generations, and there is a natural horse breeding land, Yang Hao doesn't know what the situation is over there in this era, but if it is fused with the poor tribe of the Youqi clan, it is very likely that the tentacles will be extended to that side.

After all, Sima Qian said that the descendants of the Xiongnu Xia Hou are also, if according to this statement, the ancestors of the Xiongnu in this era are not much different from the ancestors of Huaxia.

Since one of the Xia Dynasty can become an enemy that has plagued China for thousands of years, and in this era, who can guarantee that this entry into the city will not speed up because of his arrival.

After all, the original historical process has been disrupted, and if such a nomadic force really appears, Yang Hao is not confident that he will do better than the dynasties of later generations.

The country of Qi now only has a small land, with a population of less than 100,000, and with its current strength, it is difficult to resist the raids of nomadic tribes who have learned to ride horses.

This is also one of the reasons why he didn't move the northern Guan clan, there is such a small force in the north of the Qi country, it can buy a lot of time for the Qi country, if possible, Yang Hao even wants to secretly support the Guan clan and let them delay for a while.

As long as he gives himself a few more years, when his wings are growing and the comprehensive national strength of Qi has developed qualitatively, he will have a certain degree of confidence and let these enemies who are scurrying around roll to the north to eat sand.

When Yang Hao was worried that the poor clan would become bigger, the poor clan in the north, just like the worst outcome that Yang Hao expected, did not rush south to plunder after the arrival of spring, but turned around and turned to the north.

Because after plundering the south before winter, coupled with the white plague in late winter and early spring, the current Chuan Guan clan has long been poor.

At this time, the looting gains outweigh the losses, and the poor leader also understands this, as for the Youyou still clan, he doesn't plan to turn his face with him now, after all, he is not sure that he can hit and throw it in one fell swoop, and maybe a mistake will greatly reduce the strength of the tribe.

And those tribes in the north, although poor, are weaker, and those tribes live on water and grass, there are many cattle and sheep, and more importantly, there are a large number of wild horses there, which is the most attractive place for him.

With a creature with extremely mobile ability, such as a war horse, the range of activities of the Youqi clan was suddenly expanded several times, and the Youqi clan was different from the Qi country.

It does not directly rule over the occupied area, as long as the other party submits to itself, and in fact it still belongs to the category of tribal alliances, and does not form a powerful state institution.

Both methods of ruling have their pros and cons, but for the leaders of both sides, the one that suits them is the best.

Yang Hao did not cut the fat of the poor clan, and the concubine also did not care about the kind of system of Qi through Shuo Xiang's description, and did not put Qi in his eyes at all, even after Qi defeated the Zhuxia coalition army.

The current Zhuxia, in the eyes of the concubine, is just a woman who allows herself to be ravaged, as long as she is willing, she can strip this woman naked at any time and let herself play with it.

With the growth of the poor clan, it can be said that there is not much time left for Qi Guo and Yang Hao.

In Chang'an City, after Yang Hao finished handling his daily official duties, he was alone in the palace, researching the ratio of gunpowder.

As for how to purify nitrate from nitrate, Yang Hao has not found a very good way, so he can only have an extremely inefficient method of scraping nitrate.

In addition to collecting guano droppings, the workers who collect guano have a new task, which is to collect the white-haired rocks and soil.

Although they didn't know what this thing was for, the workers didn't want to guess what the court was doing with these things, anyway, everything was the same in this smelly place.

The formula of gunpowder Yang Hao is naturally clear, but it is all theoretical, and Yang Hao has not really made it in the previous life.

The so-called one sulfur, two nitrate and three charcoal is only a theoretical formula, and there is still a gap between it and the actual situation.

As for the sulfur needed in gunpowder, there are some copper mines in Chang'an City, but the quantity is scarce.

If you save a little use, you can barely support it, and the consumption of the team.