Li Siyuan knew that Yunzhou was not easy to fight, and after Li Keyong occupied Hedong, it was not that he had never fought Yunzhou.

At that time, Hedong was still very good at siege, but he still had no problem with Yunzhou.

At this time, the Khitan army had already carried out the third division of troops, and the seventy or eighty thousand cavalry composed of other Khitan divisions went to plunder the Shan Yu Protectorate and the Wuzhou Governor's Mansion respectively.

At this time, Yelu Abaoji only had more than 100,000 cavalry in his hands, and the Khitan was not good at attacking the city, if he failed to defeat Yunzhou, it would definitely damage morale, and when the reinforcements of the Tang army came, it would be troublesome.

Li Siyuan's original intention was to hope that the Khitan's trip was just a plunder, and there was no need to engage the main force of the Tang army head-on.

However, Yelu Abaoji was obviously young and vigorous, and did not want to do the work of looting like this, but ordered the siege of the city.

Li Siyuan couldn't persuade Yelu Abaoji to go his own way, because as soon as he persuaded him, several of Yelu Abaoji's brothers would frame him with words like he had different intentions.

Since Yelu Abaoji lacked enough trust, Li Siyuan also chose to shut up.

Just when the Khitan army on this side couldn't get along with Yunzhou City, the battle situation in the west of Shan Yu Duhufu had changed.

When the 60,000 or 70,000 Khitan cavalry plundered the territory of Shan Yu Duhufu, Li Cunxiao led a vanguard force of 25,000 cavalry to arrive at Shan Yu Duhufu.

The army in Li Cunxiao's hands is all cavalry, composed of the Zuo Shenwei Army and a part of the party cavalry, and the core is naturally the cavalry of the Zuo Shenwei Army.

Although there were only 25,000 cavalry, under the leadership of Li Cunxiao, he gathered the army of Shan Yu Duhufu and launched an attack on the Khitan cavalry.

At the beginning, the Khitans did not take it to heart.

Although thousands of people were lost, it did not break the bones of the Khitans.

Instead, under the strong suggestion of Yelu Thornge, these tens of thousands of Khitan cavalry continued westward to find the Tang army that killed their tribe and find the field.

As a result, the first large-scale cavalry engagement of the Khitans on the Tang border was fought on the grasslands west of Shan Yu Duhufu.

Since the elite cavalry was in the hands of Yelu Abao, most of the Khitan cavalry on the side of Shan Yu Duhufu were the personal cavalry and tribal warriors of the tribal leaders, and there were very few armored cavalry.

Needless to say, the outcome of this battle ended with the defeat of the Khitans.

The 60,000 Khitan cavalry killed nearly 20,000 and was finally forced to retreat eastward.

The cavalry of the Khitans was very mobile, but the disadvantage was that they suffered a lot in such a large-scale head-to-head confrontation, because the weapons and armor were inferior to the Tang army.

They may be stronger than the cavalry of the Dangxiang, Tuyuhun, Tatar and other tribes, but they are inferior to the regular cavalry of the Tang army in armor.

If it only loses more than 20,000 people, it is nothing.

The key is that Yelu Thorn Ge died in battle and was beheaded by Li Cunxiao, and Li Cunxiao's bravery shocked the Khitans.

Yelu Thorn Ge is Yelu Abaoji's own brother, but he was killed by the Tang people, thinking of Yelu Abaoji's anger, the other leaders are also a little hairy in their hearts.

The news of Yelu Abaoji's death did not reach Yelu Abaoji's ears so quickly, and here in Yunzhou, Yelu Abaoji once again encountered a dilemma in Dongxi City and Mengcheng.

After all, Dongxi City and Mengcheng were only built in the past two years, and the Dongxi people themselves were not very good at defense.

But Yunzhou is different, as a strong city in the north, the city is strong, and the Khitan army has failed to attack Yunzhou City for nearly ten days, but has lost many soldiers.

Yelu Abaoji, who suffered losses again, gave up the operation of continuing to attack Yunzhou City, but began to go south, intending to plunder Shuozhou, Daizhou, and even attack Yanmen Pass and plunder the hinterland of Hedong.

It was good to think about it, but the Zuo Tiance army led by Wang Yanzhang arrived in Shuozhou and fought with the Khitan vanguard troops.

The Khitan vanguard army was outnumbered and could only retreat north.

Hearing that the Tang army reinforcements had arrived, Yelu Abaoji killed the army with a large army, intending to defeat the Tang army reinforcements in one fell swoop.

There was a big battle in Shuozhou, but they didn't win or lose, and they lost a lot of people.

Wang Yanzhang also found that the Khitan army in front of him was a little strong, so he chose to defend in Shuozhou, waiting for several other reinforcements to arrive, and then trying to attack.

When Yelu Abaoji planned to defeat the Tang army of Shuozhou in one fell swoop, he learned that the tribe's army had lost troops in Shan Yuduhufu, and Yelu Thorn Ge was also killed in battle.

The arrival of this bad news undoubtedly made Yelu Abaoji furious, but when he learned that the army of the Protectorate of Anbei was coming, Li Siyuan persuaded Yelu Abaoji to lead the army to leave Daibei.

"It's my own brother who died, not your own brother, so you naturally can't feel that kind of feeling!" Perhaps it was the death of his brother that made Yelu Abaoji too sad, and it was rare to get angry with Li Siyuan.

"Yu Yue! None of us want to see the death of Jerod in battle. However, the Tang army of the capital of Anbei has arrived, and there is also the Tang army of the Tang army in the south, if it continues to drag on in Daibei, our army is likely to fall into the predicament of defense.

Now, we can't go head-on with the Tang army, otherwise we will only suffer. Li Siyuan persuaded hard.

However, Yelu Abaoji was in the pain of losing his brother, and he couldn't stop at all, so he led the army to the west to kill.

But at this time, the follow-up troops of the Protectorate of the Northern Protectorate of Anbei also arrived on the battlefield, and the two sides fought again.

The infantry of the Tang army was very powerful, and the Khitan cavalry suffered a big loss.

Yelu Abaoji, who suffered a loss, reacted at this time, and at this time another reinforcement of the Tang army arrived at the boundary of Ulzhou and Wuzhou, and he felt that something was wrong, so he remembered Li Siyuan's words, and no longer entangled with the Tang army, but fled north.

However, the loss of tens of thousands of cavalry and the death of Yelu Thorn also made Yelu Abaoji a little unwilling to retreat like this.

At the suggestion of Li Siyuan, the Khitan cavalry went east to attack the Andong Protectorate.

However, this time, Yelu Abaoji did not continue to attack a certain city, but only to plunder.

The Khitan cavalry was all light cavalry, and they were very flexible, and after they no longer attacked the city, the Tang army also had no problem with the Khitan cavalry for a while.

In the end, the Khitans were like no one and plundered a lot of people and livestock in the territory of the Andong Protectorate.

It seems that the Tang Dynasty finally drove out the Khitans, but in addition to eliminating tens of thousands of Khitan cavalry, the northern border was patronized by the Khitans.

In fact, this time the Khitan made a mistake in the south, and it was actually Datang who suffered.

There is no doubt that this made Li Ye very angry, and the inaction of the Anton Protectorate made Li Ye even more angry.

Li Ye directly ordered Liu Rengong to be removed from all his posts and escorted to Luoyang for trial.

And the post of Anton Protector was taken over by Zhu Jin.

This time the Khitan army invaded the south, which undoubtedly made Li Ye's face crackle.

Li Ye naturally won't be slapped in the face and not fight back.

In addition to rectifying the border defense of the Anbei Metropolitan Protectorate and the Andong Metropolitan Protectorate, the imperial court also increased troops to the Liaonan Metropolitan Governor's Mansion to strengthen the strength of the Liaonan Metropolitan Protectorate.

In addition, the Andong Protectorate also began to send troops into the Khitan sphere of influence.

At the Yuanri court meeting in the sixteenth year of Qianning, Li Ye announced the Northern Expedition to the Khitan in public, and it was also a personal expedition by the imperial driver.

This Northern Expedition was prepared for less than a year, but the imperial court still gathered hundreds of thousands of troops, and the Tang Dynasty, which had endured for nearly a year, finally showed its fangs.

At the beginning of March of the sixteenth year of Qianning in the Tang Dynasty, Li Ye personally led the left and right Shenji battalions, left and right prison guards and other armies to Youzhou City.

In mid-March, the Northern Expedition officially began.

The entire Northern Expedition was divided into three routes.

On the left side, Anbei Metropolitan Protectorate was the mainstay, with Li Hong as the capital, including Zuo Shenwei's army, Dangxiang cavalry, Heichezi Governor's Mansion, and Dongxi Governor's Mansion, a total of 100,000 cavalry, and launched an attack on the Khitan through Dongxi.

On the right side, the Liaonan Governor's Mansion was the mainstay, with Li Wenzhong as the commander, and the troops included Zuo Xiaowei and the Liaonan Governor's Mansion itself, with a total of 60,000 cavalry, attacking the Dongxi Shulu clan, Shatuo Department and Khitan from the south.

The middle lane is the main force, with Liu Kui as the capital. In addition to the army of the Andong Protectorate, there are also the Zuo Tiance Army, the Left Shenwu Army, the Right Shence Army, the Left and Right Shenji Battalions, tens of thousands of state soldiers, unity soldiers, etc., with a total strength of 250,000 troops, including 100,000 cavalry.

Li Ye also moved with the army in the middle lane, and took the left and right Shenji battalions and the left and right prison guards.

The three-way army, with a total of 410,000 people, plus 200,000 people, this Northern Expedition can be described as the largest operation since Li Ye ascended the throne.

"Kill!"

When he saw the soldiers of the Khitan army, tens of thousands of Tang cavalry led by the Right Shence Army were killed.

The battle flag embroidered with 'Tang' flew everywhere in the Khitan grazing land, and when the Tang army came to kill in a mighty way, the Khitan knew that he had provoked an enemy who should not be provoked.

When Yelu Abaoji saw that his most elite cavalry, in front of the Tang cavalry, was still invincible, his face turned pale.

But this was not what scared him the most, after the sound of thunder and the appearance of wooden sticks that could breathe fire, the Khitan cavalry fell in pieces.

The Khitan cavalry, which once dominated the outside world, suffered the biggest crisis since its rise at this time.

Yelu Abaoji, the king of an era!

It's a pity that he met Li Ye!

A king who doesn't belong to this era.

The Khitan in front of him is not Li Ye's ultimate goal, Li Ye's dream is to plant the banner of Datang in all corners of the world, so that Datang can become the most powerful empire.

Wherever the sun and the moon go, it is the territory of the Tang Dynasty!