The Great Song Dynasty has an indescribable relationship with Jiaozhi.

As early as the late 10th century AD, when the Song Dynasty unified China, the Great Song Dynasty destroyed the Southern Han Kingdom that established the capital of Guangzhou, and Ding Lian, the king of the Ding Dynasty of the Yue Kingdom, was also called a vassal and was named the king of Jiaozhi County.

Soon after, Li Huan, a powerful minister of the Ding Dynasty, usurped power and became independent, and Song Taizong sent troops to conquer in order to maintain the original throne of the vassal and marched to Annam by land and water in the spring of 981.

After the Great Song army went deep into a strange place, it was unfavorable in the water battle of the Baiteng River, entered the mountainous area and fell into an ambush, the forward was defeated, and the follow-up troops were difficult to supply.

Seeing that the war was at a stalemate, the Ding Dynasty of Jiaozhi sent an envoy to ask for peace and was willing to be a vassal, and the Great Song Dynasty could not march at that time, and was restrained by the Liao State and Western Xia in the north, so he had no choice but to make Li Huan the king of Jiaozhi County.

In this war, the Great Song Dynasty deeply understood the harsh combat conditions there.

Once the soldiers from the north penetrated deeply, they felt "unsuitable" and the war would be bogged down as long as it dragged on.

After all, the Jiaozhi Dynasty was weak and difficult to continue to fight, and immediately expressed its willingness to pay tribute after defeating its opponents

and respect the Central Plains Emperor Zhengshuo, willing to occupy the status of a vassal in order to protect himself.

From the point of view of military geography, the northern part of Cochin is easy to defend and difficult to attack.

The border area is steep and densely forested, and only a few mountain passes can be passed, which is easy to hold, and the mountainous and jungle areas are convenient for the defenders to conceal their troops and wait for opportunities to carry out guerrilla raids.

Moreover, even if the army marching south crossed several east-west mountains, encountered several turbulent rivers, and then entered the paddy fields of the Red River Plain, the infantry cavalry would be difficult to move and feel embarrassed.

In addition, the unique climate of Cochin is often the nemesis of the northern army.

It is unusually humid, half a year is the rainy season, and there are epidemics that are difficult for outsiders to resist, and it has been called "the land of miasma" by the Central Plains people for thousands of years.

In the region, the dry season, from November to May, is usually chosen, and when the rainy season comes, the rivers will flood and many roads will be flooded.

Judging from the historical wars, the northern army can generally only choose to fight here in the dry season, and if it cannot be resolved quickly, once the war is delayed until the rainy season, it will often be forced to retreat due to many diseases and supply difficulties.

Therefore, Jia Pingzhang Jia Yidao's choice to attack Jiaozhi at this time was considered in advance.

The so-called "Sanzhou Massacre" refers to the fact that in 1075, Li Changjie, the imperial lieutenant of the Li Dynasty, took advantage of the internal instability of the Song Dynasty due to Wang Anshi's reforms, and led 100,000 troops to attack Liangguang in three ways, and they captured Qinzhou, Lianzhou, Yongzhou and other places, and slaughtered hundreds of thousands of soldiers and civilians!

Especially during the attack on Yongzhou, which was later Nanning, Guangxi, because Zhizhou Su Mian was unwilling to surrender, he led his family of 36 people to set himself on fire.

Li Changjie slaughtered more than 58,000 people in the city, and killed hundreds of thousands of people in Qin and Lianzhou, and Chang Jie and others captured the people of Sanzhou and returned.

After the recovery of Yongcheng, Song Shenzong posthumously presented Su Mian as "Fengguo Festival Envoy" and overflowed the name "Loyal and Brave".

Jia Pingzhang believes that this incident can be used as the best excuse to pacify Jiaozhi, and it is also the easiest to arouse the anger of the people and improve morale.

In fact, this is not an important reason for attacking Jiaozhi.

There are two real reasons, one is that the open-pit coal mine near Ha Long Bay in Jiaozhi attracted Jia Pingzhang's attention.

The demand for coal in the entire Great Song Dynasty has reached a state of hunger and thirst that has never been seen in history.

Not to mention the demand for coal in the folk life of the Great Song Dynasty, there is a lot of demand for all kinds of large and small workshops that have sprung up on Liuqiu Island alone!

Powerful families can seize high-quality water resources to set up hydro textiles------ but there is no power but there are certain financial resources of course, but of course they are also very eyed in the cotton textile industry, they unconsciously imitate the practice of Liuqiu Island, with a pot camel machine as the driving force!

It is a bit wasteful to use steel casting for pot camel machines below 20 horsepower, just use cast iron directly.

Its structure is simple and durable, and it can also be used as a steam source to heat or dry------ several models of small pot camel machines produced on Liuqiu Island have long been widely advertised by the "Liuqiu Times" for everyone to know about the large, medium and small households and workshops of the Great Song Dynasty.

In addition to large and small sea vessels, the pot camel machine is the most technical industrial product exported by Liuqiu Island to the Great Song Dynasty.

The main family, Wang Defa, did not price the pot camel machine too high at the beginning, and he was worried that the people of the Great Song Dynasty would not buy it.

He begged Guo Ziren, the director of customs, to persuade him to raise the price, but he did not agree, saying: "Wait for a while, if the people of the Great Song Dynasty can really recognize the usefulness of the pot camel machine------

To be honest, he was really worried that the people of the Great Song Dynasty would be afraid of this kind of iron guy who burned coal and made a bang.

Later, he found out that he had underestimated the intelligence of the people of the Great Song Dynasty!

At this time, the people of the Great Song Dynasty did not go through the massacre of the Tatar bandits, nor were they mentally retarded by the later Tatar robbers------ they still maintained a strong curiosity and strong ability to accept new things, especially useful new things!

The pot camel machine is so good that some people even come to Liuqiu Island to squat at the gate of the factory and wait for the goods!

The main family, Wang Defa, laughed, saying that he had forgotten that the Great Song Dynasty at this time was the era of free economy!

He had to raise the price to cope with the rush to deal with the rush to buy.

Guo Ziren, the director of Liuqiu Customs, was worried that the people of the Great Song Dynasty would imitate the ------ and the owner of the family, Wang Defa, affirmed that the people of the Great Song Dynasty had no such ability.

No matter how simple the structure of the pot camel machine is, it also needs the machining ability of the machine tool with the precision below five wires, and it is impossible to forge it by hand.

This time he was right, for several years, only the island of Liuqiu could produce this thing.

In this way, the demand for coal far exceeds the demand for steel!

The price of coal rose month after month, and the coal excavated by Liuqiu Island in Halong Bay in Jiaozhi did not have time to be washed roughly, and it was sold as much as it was produced.

Of course, the kerosene produced on the island is the most profitable product.

The Great Song Dynasty never understood where the kerosene was obtained from Liuqiu Island------ and even some people tried to squeeze coal, which was of course very stupid.

But those who have a heart in the Great Song Dynasty can easily find a place to dig coal on Liuqiu Island!

Some powerful people who belong to Jia Pingzhang's faction really take a fancy to that place------ it is a coal mine that can be dug directly with a shovel, just like picking up money for nothing, ah, ah!

In the end, this attracted Jia Pingzhang's attention.

He needs a foreign war of sufficient scale to divert the attention of his domestic political opponents, and wouldn't it be better if it could still bring benefits?!

So, the cochin lay down.

The Great Song Dynasty's "Minsheng Daily" suddenly moved out the Sanzhou Massacre hundreds of years ago, and also proposed to commemorate the heroic deeds of Su Mian, the envoy of the Fengguo Festival!

Jia Pingzhang met with Zhao Yu, an official of the Great Song Dynasty, in private, and explained some of the benefits of pacifying Jiaozhi.

After hearing this, Zhao Yu, the official of the Great Song Dynasty, felt much lighter in his body and bones------ there is no emperor who does not like to open up the territory, and there is no need to say more about the benefits of winning Jiaozhi.

Zhao Yu, the official of the Great Song Dynasty, hurriedly summoned the commander of Fake, and the three of them began to discuss.

Commander Fa Ke proposed to attack from the sea and learn from the method of the Liuqiu Guards to capture the Shandong region, bypassing the mountainous areas north of Cochin.

Da Song was already familiar with landing battles, and there was a precedent for the Liuqiu Guards, so of course the three of them talked about speculation.

I used to think that Cochin was just a place to produce ivory, ebony and other useless things, but now I find that it is a treasure land!

Of course, the three monarchs and ministers did not explicitly say that it was too easy to find a righteous name for the coal ------.