April 16, 259 BC, Handan.

Compared with Qin Wangji's impatience, Zhao Dan was much calmer.

Zhao Dan was not in a hurry at all.

First of all, the newly established new army of the Zhao State needs time to improve and stabilize its combat effectiveness.

According to Lecheng and Pang Xuan, it will take at least three months to have some appearance, half a year to initially have combat effectiveness, and three to five years to fully form combat effectiveness.

Of course, if there are a few big battles and victories, this time will be greatly reduced.

After all, a life-and-death battle is very great for the tempering and growth of soldiers, and it is not an exaggeration to describe it as coming in by leaps and bounds.

In addition, the materials extorted by Zhao Dan from Wei Wangyu also took time to be transported in place.

With Wei Wangyu's virtue, Zhao Dan felt that Wei would definitely delay and not be so refreshing when transporting supplies, which would also take some time.

There is also Wei Wuji, although this Xinling Jun had a certain strength in the Wei State before, but after stealing the talisman to save Zhao, Wei Wuji's team was purged, even if Wei Wuji has made a comeback at this moment, it will take some time to consolidate his power.

Only when Wei Wuji, the leader of the pro-Zhao faction, gained a firm foothold could Wei be considered a true ally of Zhao.

All of this is not something that can be done in a moment, it takes time.

Zhao Dan can afford to wait for this time, anyway, it is not ten or eight years.

What's more, Qin Wangji is now a sixty-five-year-old man, and Zhao Dan is only in his twenties.

The only thing that made Zhao Dan a little unhappy was that judging from his memory, Qin Wangji seemed to have many years before he died.

Qin Wangji's longevity has never been a good thing for the six eastern countries.

In general, these days, Zhao Dan should eat and drink, usually deal with government affairs, go to the queen when he has time, and then go to his own wives to inspect the homework of the sons, tease and tease the little princess, and time flies quite quickly.

On this day, the eunuch of Zhao State, Ling Mixian, hurriedly came to Longtai.

When Mi Xian entered the side hall, he found that Zhao Dan was leaning over a map spread on the table, holding a pen and pointing at him, not knowing what he was talking to himself.

Mixian didn't dare to slack off, and stepped forward to salute: "King." ”

Zhao Dan glanced up at Mi Xian, and then turned his gaze back to the map in front of him: "What do you have to report on Mi Qing?" ”

Mi Xian held a bamboo slip in his hand and put it in front of Zhao Dan, and said: "According to the Zhongshan County Shoulai, there have been many small groups of Yan troops crossing the border recently, and I don't know what they are trying to do. ”

Zhao Dan immediately frowned when he heard this, and said after a while: "Is there a conflict?" ”

Mi Xian said: "After the county guard got the report, he ordered the county lieutenant to send troops to expel him, but the details have not yet been reported. ”

Zhao Dan sighed, feeling a little unhappy in his heart.

In the era when information is not smooth, this is not good, if something happens, it is reported layer by layer, and then it goes to Zhao Dan and gives instructions layer by layer, and it has to be passed back and forth by fast horses, and it is really a waste of too much time to go back and forth.

Zhao Dan thought for a while, and said to Mi Xian: "Mi Qing, in the next time, you will first let the inspectors increase the supervision of the border area, and the widow hopes that any change in the border will be able to get the news as soon as possible, understand?" ”

Mi Xian responded, and then said: "King, if the Yan army does this again in the future, what should we do?" ”

Zhao Dan slapped the table: "Slap him!" Uh... The widow means that whenever the Yan army enters the country, the widow will be arrested, and those who resist will be killed! ”

This is not Zhao Dan's stinginess, what is the armed forces called trespassing into the territory of other countries, this is called invasion! As a monarch, how could Zhao Dan be indifferent to the invasion?

As for whether the Yan Council will start fighting... Just kidding, with the current Zhao Kingdom, are you still afraid that Yan Guo will not succeed?

Seeing that Mi Xian was about to take the order and leave, Zhao Dan stopped him again.

"Miqing, send a few people to these places on the map to investigate."

Mi Xian walked back and looked at the map in front of Zhao Dan.

This is a map of the geographical territory of the mountains and rivers of the Zhao Kingdom.

Of course, if you look at it from the perspective of future generations, this map is simply rudimentary...

But no matter what, you can still understand it.

Zhao Dan clicked in several places on the map and said, "Here, here, and here, Miqing has sent people to investigate." ”

Mixian took a few closer looks, kept these places firmly in his heart, and said, "No." But what does the king want his ministers to investigate? ”

Zhao Dan couldn't help but smile when he heard this, and said, "Shitan." ”

Coal is the name of coal in this era.

Jin is another name for Shanxi in later generations.

What is the most mineral resource in Shanxi? Coal mines, of course!

In addition to coal mines, there are many minerals in Shanxi, such as bauxite, iron, copper, manganese, gold and many other minerals.

The Warring States period coincided with the transition from the Bronze Age to the Iron Age.

Although it is said that in history, it was the Qin State that was dominated by bronze weapons that destroyed the Six Kingdoms, but as a traverser, Zhao Dan certainly understood that iron weapons were the future.

At this time, the smelting of bronze can be said to have reached the peak of the entire Chinese history, and the smelting of iron has just started, so the Qin army can become the ultimate victor with weapons that are one era behind.

If Zhao's iron-making skills can be taken to the next level, then Zhao will be able to take a great lead over Qin in terms of weapons.

If you want to smelt iron, the first thing you need is iron ore, and there are already several large iron mines in Zhao State, and ore is not a problem, smelting is.

When it comes to ironmaking, the simplest and most feasible way to make people think of it is of course blast furnace ironmaking.

Although there are many drawbacks in blast furnace ironmaking, such as heavy pollution and serious waste of resources, the blast furnace ironmaking method is too advanced for the Warring States that have just entered the Iron Age.

Blast furnace ironmaking requires a large amount of coal.

And the place with the richest coal production in Chinese history is now within the territory of Zhao!

Before, it was because the Battle of Changping involved too much energy, but when the Battle of Changping ended and the surrounding situation of Zhao began to stabilize, Zhao Dan planned to start his journey of climbing science and technology.

In fact, this technology is not so easy to climb, after all, such an industry usually requires a large number of labor, and population happens to be one of the weaknesses of Zhao State.

So Zhao Dan is also planning to take a step at a time, in short, it is not wrong to start ironmaking first, if it doesn't work, the scale will be smaller.

In fact, compared to iron smelting, Zhao Dan wanted to get gunpowder more.

But gunpowder is a hot weapon, and it is much more difficult than ironmaking.

And even if gunpowder is researched, it must be matched by muskets and artillery, and guns and cannons are inseparable from steel, so it is the right way to develop the steel industry first.

···

Looking at the back of Mixian leading the order to leave, Zhao Dan's heart was happy.

Qin Wangji, you wait for the widow, wait for the widow's technology to rise, and beat you scum in minutes!

But Zhao Dan thought about it, where is this industrialization so easy? Steel can still be counted on, gunpowder is estimated to be really usable, and the widows have already unified the Central Plains...

But it doesn't matter, if the Central Plains are unified, then the widows will use it to fight the Huns, to fight Europe, and to conquer the world!