After the more than 60,000 soldiers of the original Xia Kingdom were reduced to 25,000 people, Su You distributed these people to Su Lie, Fan Yuan, Wang Fubao, Dong Kangmai and Liu Heimin, and asked them to lead 5,000 people each to collect the land that originally belonged to the Xia Kingdom.

Except for Liu Heimin, who was still seriously injured, the rest of the people were relieved after receiving Su You's order, and they were all in full swing to make preparations before the expedition.

These people originally thought that after Su You surrendered to them, they would be deprived of military rights from then on, but they didn't think that Su You would not use a soldier from the original Xia Kingdom, and provide them with food and grass, as well as sophisticated weapons and armor.

The main reason why Su You let them still carry the original soldiers and was not afraid that they would turn against him was because he had the most advanced weapons and Li Jing was about to come over to join him.

In the past, Dou Jiande and more than 60,000 soldiers could only surrender to himself, not to mention the 25,000 people now?

Su You equipped them with sophisticated weapons and armor, but they were not open to them in terms of firearms, Su Lie, Fan Yuan and the others naturally didn't dare to think nonsense, after all, their destination was the city that originally belonged to them, and they led the 5,000 army to reclaim those small cities, could they use firearms?

At the same time, Su You ordered Xue Wanche to classify the enemies captured from Liu Fangwu Fort and select more than 500 of them to be incorporated into his cavalry team.

According to Su You's understanding, heavy cavalry overcomes infantry, light cavalry also overcomes infantry, and the role of infantry is only manifested in siege warfare.

The problem is that the way Su You attacked the city now relies heavily on firearms, so the role of the infantry of the Yunzhong Army is only to defend.

As far as the current war in the Central Plains is concerned, Su You does not have the opportunity to use a large number of infantry, in fact, he will have to fight with the Turks in the steppe in the future, and the infantry does not have any advantage.

Based on the deployment of the future, the most urgent need for the development of light cavalry in Su You is still the most urgent need.

Light cavalry can defeat infantry, as well as heavy cavalry. - The men and horses of the heavy cavalry were equipped with armor, and the weight was too great, and they did not have an advantage over the light cavalry in terms of staying power and speed.

If Su You wants to deal with the Turks in the future, he must not use artillery, nor can he use heavy cavalry, let alone infantry.

The only option left is to ride lightly.

Suyou now has two horse breeding bases, one is in Lincang in Nanzhong, and the other is in Liaodong, which has only recently been established. ——Listing Liaodong as a horse breeding base is just Su You's helpless move, after all, Liaodong did not produce horses in history.

The main horse-producing area of the Central Plains is Hequ, but Su You is not sure if his battle with the Turks will wait until he takes Hequ; In any case, he urgently needed his light cavalry to be strong and not afraid to fight the Turks in the steppe at any time.

In the Hequ area, at this time, Li Xuanba had begun to fight with Liang Shidu; In the Longxi area, Li Shimin broke Xue Rengao in Fufeng County, and he pursued until Longshan before collecting his troops.

Then, Xue Ju's army invaded Chang'an, and the forward scout appeared in Qizhou, which was very close to Chang'an.

Li Yuan ordered Li Shimin, the Duke of Dunhuang, to lead more than 100,000 soldiers to meet Xue Ju, according to Li Yuan's established policy, after Li Shimin arrived at the front line, he loved to die and fought a war of attrition with the Qin army led by Xue Ju.

Li Shimin led an army of 100,000 people, and the daily consumption was huge, but fortunately, after the Tang army entered the main pass, he took the opportunity to seize several large granaries.

The grain in Taicang and Yongfeng was enough for Li Yuan's 200,000 troops to eat for a year, so food was not a matter for Li Shimin at all.

Xue Ju's Qin army came from afar and was dominated by cavalry, so the grain and grass they needed to consume every day was not less than that of the Tang army; What's even worse is that the territory controlled by Xue Ju is only four counties, which is not only narrow but also barren.

Li Yuan formulated a strategy to fight with Xue Ju, based on the story of Sima Yi and Zhuge Liang.

The problem is that Zhuge Liang's Shu army did not have any war horses, so it was dragged down by Sima Yi's deep ditches and high fortifications; But Xue Ju's Qin army had a large number of cavalry, and the composition of his army was obviously different from that of Zhuge Liang back then.

In the confrontation with Li Shimin, Xue Ju constantly sent a cavalry team of 1,000 people to bypass the Dazhai of the Tang army and harass the grain road in the rear of the Tang army; Some of the brave even rushed to the vicinity of Chang'an, burned, killed, looted and then left.

Xue Ju's cavalry of 1,000 people continued to attack the Tang army with harassment tactics, so that Li Shimin, who was originally invincible, was defeated by Xue Ju in terms of attrition.

In the face of Xue Ju's guerrilla tactics, Li Shimin really couldn't find good preventive measures.

The news that Xue Ju's cavalry rushed to the vicinity of Chang'an to burn and loot shocked the Chang'an court, and Li Shimin's prestige also declined; Li Yuan has no doubts about employing people, and he defends Li Shimin in every possible way, but the latter is young and vigorous, where can he bear so many grievances?

As the second son, Li Shimin, if he wants to be recognized by Li Yuan, he can only show his ability.

In this troubled era, only opening up the territory is the greatest achievement, and Li Shimin finally decided to put it to death and come back to life.

"Since you haven't been able to fight with the Qin army, let's fight to the death with Xue Ju!"

Liu Hongji, Yin Kaishan, Li Anyuan, and Murong Luohu did not oppose Li Shimin's decision, including Liu Wenjing, the head of the march.

These generals were trapped in the camp and had no battle to fight, and they had already panicked.

Regarding Li Shimin's decision to fight, they were in favor of it with both hands; Liu Wenjing was cautious, he originally agreed with Li Shimin's decision to refuse to fight, but after this plan didn't work, he could only think of other ways.

Li Shimin then led the army out of the camp and set up a formation in the shallow water plain to meet Xue Ju's Qin army.

Longxi was a place where horses were raised in the Sui Dynasty, so the Qin army was mostly cavalry, and in response to this, Li Shimin adopted a strategy of defensive counterattack.

At the time of the formation, Li Shimin concentrated the infantry in the middle and placed the cavalry in the rear; The troops on both sides are the largest, but most of them are people from all walks of life who defected to the Tang army when they entered the pass, and they are numerous but not necessarily strong in combat.

Li Shimin arranged them on both wings in order to confuse Xue Ju.

If Xue Ju saw that most of the soldiers on both wings of the Tang Army thought that the heavy troops of the Tang Army were on the two wings, and adopted the technique of breaking through the middle to pierce the middle lane before the two wings of the Tang Army closed, then he fell into Li Shimin's trap.

Who knows that Xue Ju has a heroic personality, and he is not proficient in these conspiracies, he only knows how to fight hard.

In Xue Ju's mind, his cavalry is invincible, even if he knows that Li Shimin will ambush the elite soldiers in the middle, he will still wave his army to attack the middle.

The strength of the Tang army and the Qin army is about 100,000, the Tang army has more foot soldiers, and the Qin army has more cavalry, and in terms of combat effectiveness, the two sides are comparable.

But as soon as the battle began, the Qin army kept pressing the Tang army.

Li Shimin's arrangement was cleverly arranged, and Xue Ju seemed to have fallen into his trap. At the beginning of the war, the Qin army's fierce general Zong Luohu led 5,000 elite horsemen to abandon the two wings and attack the middle of the Tang army.

On the surface, although the Tang army suffered heavy losses, it was still within Li Shimin's tolerance.

Through the miscellaneous soldiers consumed, Li Shimin wanted to intuitively understand the strength of the Qin army; In this way, we can better adjust our tactics, avoid the real in the real battle, and defeat the opponent in a grand way.

The leaders of the Tang Army's Middle Route Army were Liu Hongji and Yin Kaishan, and the 10,000-strong team they led was undoubtedly the elite of the Tang Army.

Li Shimin led 3,000 Xuanjia elite cavalry to press the formation in the rear, and after the Qin army's elite cavalry touched their heads in front of the infantry phalanx and broke the bloodstream, Li Shimin killed them from behind and defeated them in one fell swoop.

Li Shimin's tactics were very good, but the problem was that the elite infantry under the command of Liu Hongji and Yin Kaishan could not block the cavalry impact in the locality, and the infantry on the front line was quickly defeated in the cavalry attack.

After the Qin general Zong Luohu broke the first line of the Tang army, Xue Rengao immediately led Xue Ju's 3,000 personal soldiers to rush over; These 3,000 soldiers are also cavalry, and their combat effectiveness is not bad at all compared with the 5,000 cavalry of Zong Luohu.

Under the repeated rush of 10,000 cavalry, the middle of the Tang army completely collapsed.

The collapse of the Chinese army meant the defeat of this war, and in order to minimize the losses, Li Shimin did not put the 3,000 Xuanjia elite cavalry into the battlefield, but led 3,000 people to fight and retreat to the east.

Murong Luoyu and Li Anyuan died in battle to save Li Shimin; After Liu Hongji fought hard, he fell into the siege of Xue Ju and was captured with all his strength. Liu Wenjing led the troops to kill and finally rescued Li Shimin.

The battle between the Qin army and the Tang army in the shallow water plain ended in a great victory for the Qin army, and this battle was also the most serious loss of the Tang army since the uprising.

Li Shimin was in panic in the chaos of the army, and almost wanted to cut himself to thank the world, but was dissuaded by the generals; Yin Kaishan came out of the sick body, knowing that the Tang army was defeated, he almost fainted, and he couldn't help but cry.

This battle made Li Shimin understand a truth, that is, the war is not fought by an invincible commander, at least he needs an army that can execute his perfect tactics.

Li Shimin was deeply impressed by the power of the cavalry charge, and he decided to pool the financial resources of Guanzhong to create a real Xuanjia elite horseman, and to be ashamed of today's blood.

When Li Yuan learned the news of the front, he was very angry, and he transferred Li Shimin back to Chang'an.

Yin Kaishan regretted that he did not fulfill Li Yuan's order, took the initiative to take the responsibility on himself, transferred his malaria to Li Shimin, and said that he was greedy for merit and command, and made this big mistake.

Li Yuan took Yin Kaishan a heavy responsibility, and dismissed all the managers of this battle; Although Liu Wenjing had the merit of saving Li Shimin, he was also cut to the people.

Li Shimin felt guilty, so he had to hold on to his illness; Li Yuan ignored him except for scolding him hard at first.

Although Li Shimin has not left the mansion these days, he can also learn from Fang Xuanling that after Xue Ju's victory over the Tang army, Guanzhong was shaken and rumors were spreading. Subsequently, Li Yuan transferred Sun Shunde, Tang Jian and others to fight against Xue Ju.

The Tang army took advantage of Xue Ju's exhaustion and won two small victories, but Xue Ju had to temporarily hold his troops still, and the two armies fell into a stalemate again.

Hearing these news, Li Shimin breathed a sigh of relief and thought secretly, "Fortunately, none of these credits are earned by the eldest brother, otherwise I will never be able to get ahead in my life." ”

While thinking wildly, Li Shimin suddenly saw the eldest grandson Wuji happily enter the door, and said straight to the point, "Shimin, King Tang asked you to go to the Wude Palace." ”