Li Nan really knew about the blockhouse encroachment tactics, but he didn't know it from the Song-Xia War, but from the wars of various countries in later generations.

Bunker tactics, ancient and modern, Chinese and foreign, are all there.

Since primitive societies, human beings have used bunkers, and the city is in a sense the expansion of bunkers.

Pillboxes are military defensive facilities, and are generally used when one's own combat conditions are unfavorable, but they can also be used during attacks under certain conditions.

In the land of China, the period when the most bunkers were built and the largest scale should have been the protracted civil war and the invasion of the island countries.

When everyone talked about the wars between Western Xia and the Song State over the years, Li Nan couldn't help but think of the war situation in the Song Dynasty now.

The countless wars in the history of China, simply divided, were the battles between the farming people and the nomads, and the battles between the empire and the Jin kingdom today were actually of this type.

There are many examples of wars in history that prove the military superiority of nomads in field warfare, and it is needless to say about the advantages and disadvantages of nomads, the most important thing is that the farming peoples have developed for thousands of years, and they have not found too good ways to deal with them.

During the Western Zhou Dynasty, in order to defend against the attacks of the northern nomads, the Zhou Dynasty built a continuous array of castles "Leh" for defense.

In the Spring and Autumn Period and the Warring States Period, the three kingdoms of Qin, Zhao and Yan in the countries and the Xiongnu, a powerful nomadic people in the north, were adjacent to each other, and built the "Great Wall of Hu Rejection" in the north, and almost all the monarchs of the later dynasties strengthened and repaired, and finally became a Great Wall with a total length of more than 21,000 kilometers.

In this way, the majestic Great Wall was built at the cost of countless manpower and material resources, and in the end it could not resist the attacks of the nomads, and although Li Nan's Chinese Empire was developing well now, it did not have enough ability to deal with the Jin people for the time being.

After listening to the advice of several ministers, Li Nan also understood their respective thoughts.

Although Cai You's plan was not fully expressed, it probably meant that the empire agreed to trade with him, exchanging various materials and even weapons urgently needed by the Western Xia for the war horses that the empire needed most, and encouraging the Western Xia to invade the Tufan tribes in the west.

As for the future, when the war between the empire and the Jin and Song dynasties ended, it would naturally be possible to destroy the Western Xia, and by the way, the Qinghai area where the Tufan tribes were located would be included in the empire's territory.

It can be said that Cai You is worthy of being a literati of the Great Song Dynasty, and he is ruthless, even if this fair and honest strategy is seen through by the Tangut people, they will not be able to resist this temptation.

As for Li Daocheng's thoughts, it is not difficult to understand, the quality of the army of the Western Xia Kingdom is not low, and even has the comprehensive structure of the army in later generations, plus the party is also a nomadic people who grow on horseback like the Jin people, if it is supplemented by imperial resources, it is likely to develop into another powerful country in the world.

After thinking carefully for a while, Li Nan had already made a decision in his heart.

"All the Aiqing are diligent and patriotic, and I am very pleased."

His eyes swept over the ministers, and Li Nan said in a deep voice: "Although I can ignore my reputation, I can't help but think about the empire, so I can't do anything about forming an alliance first and then breaking the contract, and I can't do it. ”

Li Nan got up and left the dragon chair, came to the council hall, and said to everyone: "The footsteps of the empire will definitely not stop at the Song, Jin, and Western Xia, and there will be a war with all the countries in the future, so I have decided to form an alliance with the Western Xia in an open and honest manner." As for Li Aiqing's worries, I believe that no matter how Western Xia develops, it is just a wedding dress for the empire! ”

As the lord of a country, since Li Nan has set the tone, all the courtiers of the empire can do is to improve and implement it.

Cai You was the proposer of this matter, so Li Nan appointed him and Ludia to discuss specific matters with Ren Dejing, the envoy of Western Xia.

Li Nan was very confident in the speed and potential of the empire's development, so this time he also authorized the old muskets that the imperial army had reloaded and traded war horses as the most needed commodity in Western Xia.

During Ren Dejing's envoy to the empire, because Li Qianshun, the lord of Western Xia, loved the seventeen-year-old Ren very much, so he canonized him as the queen, so now this Western Xia envoy has become the ruler of the country.

The father is noble with his daughter, and Ren Dejing, whose status has risen sharply in Western Xia, is full of excitement, and he can't help but be overjoyed after hearing the specific trade terms that Cai You said.

In the past, when the Liao State was strong, the Western Xia could obtain the silk cloth, Luo, Qi, incense, porcelain, lacquerware, ginger, cinnamon, books, Buddhist scriptures, and most importantly tea from the Liao and Song states, which were seriously sinicized, through the trade of Yuchang and Yushi.

Since the fall of the Liao State, the Song State that entered a state of war also closed all the border fields and the city, and the subsequent Jin State was a nomadic people similar to the Western Xia, and the materials produced by the Jin countries taken by the Liao were not enough for internal consumption, so the demand for various materials in the Western Xia had reached a very urgent level.

In fact, whether it is the Jin State or the Western Xia, it is not beneficial for a nomadic people like them to conquer the Song State in the long run, for example, there are two different voices within the current Jin State.

The basic way of life of the Jurchens was formed more than 100 years before the founding of the People's Republic of China, and since they seized the vast territory of the Liao State, the Jin State that became powerful also had a lot of troubles, and it was obviously inappropriate to continue the previous way of life.

After Jin Taizu Wanyan Agu was killed, the four heavenly kings of the Aguta faction: Wanyan Zonggan, Wanyan Zongfu, Wanyan Zonghan and Wanyan Xiyin joined forces and asked Jin Taizong Wanyan Shengli to establish the thirteen-year-old Taizu's eldest grandson, Wanyan Kang, as the successor to the throne.

And the controversy over the Sinicization reform, which was not obvious, also began to spread among the upper echelons of the Jin State.

Originally, Ren Dejing still had concerns about the empire's proposal to trade war horses for other materials, but when Cai You put the muskets produced by the empire on the list of goods, he immediately couldn't sit still.

Firearms were originally developed by the Song Kingdom, but they were improved by the empire and made them world-famous.

Relying on the large-scale deployment of muskets, the long-formed imperial army fought in the north and south, which established the country with today's vast territory.

The Western Xia had long coveted the Empire's musket, and had sent envoys several times before to ask for it, hoping to exchange it for the Western Xia War Horse, but they were all refused. So hearing that now that the empire has relaxed its restrictions, Ren Dejing doesn't need to return to China to discuss with the lord Li Qianshun at all, so he directly finalized the matter.

Although Ren Dejing knew that the musket used by the empire to trade was definitely not the latest model, this was enough, after all, the only countries that had muskets in the world were the empire and the Song country, and the power and range of the muskets imitated by the Song country were even inferior to the old muskets of the empire.

The rest is simple, nothing more than the two sides negotiate the specific exchange price and quantity of war horses and muskets, etc.

In the matter of Western Xia's desire to jointly divide the two state capitals of the Song State with the Empire, Cai You and Ludia did not promise, nor did they attach any terms and restrictions to this transaction, because no matter whether Western Xia went to attack the Tufan tribes or the northwest border of the Song State, it would have no impact on the current empire.

Li Nan, who has a guilty heart for the people of the Song Realm, is now also studying how to rescue the Han people who were forgotten by the Song court and government and allowed the Jin soldiers to poison them.