About the Emperor Taishang, it will take four years of Yuanhe, starting in mid-August, things are complicated, but in fact they are also very simple, that is, what Guo Rong has been most worried about, it finally happened, and it is a way that no one can imagine, it happened bizarrely.

Before leaving Chang'an to go on the expedition, Guo Rong pointed out three routes that the Tibetans could attack Guanzhong, and put forward corresponding suggestions.

According to the three directions suggested by Guo Rong, the Lingshuo army in Longxi and the Longyou army in Longnan reduced their forces, gathered the border people, and cleared the wilderness.

Jiannanbei Province and Jiannandao Province have strengthened fortifications and contacted all ethnic groups in various prefectures, and they have also made sufficient preparations.

As the Tubo army pressed the border, the two sides entered a long state of confrontation, and this confrontation lasted for two full months.

And it was the critical time of these two months, Guo Rongming repaired the plank road, secretly Chen Cang, and took advantage of the opportunity of Changyingjun and Zuo Wuwei to attract the attention of the Hebei rebels, bypassed the Jianghuai area, successively killed the two towns of Huaixi and Jiaodong, eradicated the Jiaodong Naval Division, and completely annihilated the island soldiers who entered the Tang Dynasty.

As the time entered the middle of August, after eliminating all the hidden dangers, Guo Rong began to lead the main force of Changying's army westward, preparing for a strategic decisive battle between the Central Plains and the Hebei rebels.

Under Guo Rong's reminder, in mid-August, Emperor Taishang Li Yu and Crown Prince Li Ning, including a group of princes, led the forbidden army to leave Chang'an and stationed in various strategic places in Guanzhong.

At the same time, the Tibetans, who had been in a state of confrontation and had maintained a silent war for two months, launched simultaneous attacks from the northern, central, and southern fronts, and the war that had been brewing for nearly half a year was completely launched.

It's just that the madness of the Tubo people obviously exceeded expectations, and at the beginning of the war, the Tubo people directly entered the attack mode.

Moreover, the Tibetans seem to have entered the stage of fierce attack from the very beginning, sparing no effort in the offensive at any cost.

The envoys sent by Fan Xichao from Lingshuo Jiedu, Zhang Jingze from Longyou Jiedu, Xue Cong from Jiannanbei Jiedu, and Liu Pi from Jiannanxi (East) Sichuan Jiedu arrived in Chang'an almost on the same day, and the fierceness of their offensive can be seen.

It's just that although the attack of the Tubo people was fierce, it completely let go of the hanging hearts of the imperial court, Chang'an and even the entire Guanzhong, and the rest was nothing more than a hard-fought battle.

In the past, when the Tang Dynasty was weak and the soldiers and horses of the imperial court were insufficient, the Tang Dynasty was not afraid, but now, there are the most elite soldiers and horses in the world in the direction of Chang'an, and the Tubo people are no longer afraid.

So, according to the preparations that had been made for a long time, the forbidden army, which had been prepared for a long time, began to support in all directions according to the established plan.

There is no big problem with Longxi and Longnan, and everything is normal in Jiannan and Nandao, however, ......

After the messenger sent by Jiannan Xichuan Jiedu made Liu Pi arrive in Chang'an for support, he did not pause and turned back directly from Chang'an.

On the way back, the messenger procession of dozens of people returned to Dasanguan when it was already approaching dusk, so they chose to stay at Dasanguan for one night.

For the messengers who returned quickly after arriving in Chang'an, the left guard of the forbidden army who was in charge of guarding the Dasan Pass did not pay much attention to it.

After all, this is not the first time they have met, when they rushed to Chang'an from Jiannan Road to ask for help, the left guard of the forbidden army had strictly verified their identities, and determined that they were the soldiers and horses under the command of Jiannan Xichuan Jiedu, and after obtaining the information for help, it is actually understandable to return to Chengdu quickly.

Therefore, the left guard of the Janissaries did not carry out surveillance, nor did they carry out other restrictive measures.

However, when the left guard of the forbidden army did not expect, the problem appeared in this team of messengers.

That night, after confirming that the Forbidden Army's Left Guard did not take strict precautions against them, this small group of dozens of messengers quietly slipped out of the military tent reserved for them by the Left Guard in the middle of the night, and quietly touched the pass on the west side of Dasan Pass.

Because of the large-scale invasion of the Tubo people, the entire western border of the Tang Dynasty has entered a state of alert.

Although the left guard of the forbidden army responsible for guarding the Dasan Pass has increased its vigilance and alert level,

Because although Dasanguan is within the territory of Datang, there are Shannan Dao and Jiannan Dao in front of it, so the level of vigilance is limited after all.

As the night deepened, these messengers belonging to Jiannan Province carefully avoided the patrol of the left guard of the forbidden army, and successfully touched the pass at the right time.

Taking advantage of the relaxation of the left guard forbidden army at the gate of the pass, he suddenly killed, and without any defense, a small group of left guards who were responsible for guarding the gate instantly fell in a pool of blood.

The gate of the Great Scattered Pass was immediately lost.

After taking the gate with a wave of raids, these messengers from Jiannan Province quickly opened the gate.

Then, hidden in the darkness, a group of soldiers in heavy armor streamed in through the open gate.

Half of this army hidden in the darkness came from the Tang army of Jiannan Dao, while the other half came from the elite of the Eastern Border of Tubo, and some of them were also mixed with some short and dark-skinned Nanzhao people.

That's right, this is an anti-Tang coalition army composed of the soldiers of the Jiannan Dao Domain, the elite of the Tubo Army, and the soldiers of Nanzhao!

And Guo Rong's worst fear finally came true!

Sure enough, there was a moth on the Tibetan side.

In the past, after Wei Gao died of an accident accident, as Wei Gao's deputy, Liu Bi successfully took over the entire Jiannan Dao.

However, Liu Pi, who inherited Jiannan Dao, also inherited Wei Gao's dream: on the basis of controlling Jiannan Xichuan and Jiannan Dongchuan, he obtained Shannan Xidao from the hands of the imperial court, so as to realize the dream of dominating Sanchuan alone and becoming the world's leading feudal town.

The starting point of this dream came from the former eunuch leader Ju Wenzhen, and it was precisely by using the temptation of the "Sanchuan Festival Envoy" that Wei Gao, the biggest supporter of Emperor Li Xu, broke with Li Xu.

It was precisely because Wei Gao and Li Yu broke up that Li Xu, who lost foreign aid, was forced to abdicate under the joint persecution of both internal and external forces.

Liu Pi inherited the dream of "Sanchuan Festival Envoy", however, after the heavens did not fulfill people's wishes, and after quelling the Xingqing Palace rebellion launched by Ju Wenzhen, Li Yu, who regained control of the situation in Chang'an, and held the power of the imperial court, decisively rejected Liu Bi's request.

And this caused Liu Bi to be deeply dissatisfied, but at that time, Li Yu held the aftermath of the big victory hostage, and Liu Bi did not dare to make a mistake.

However, the house leak happened to rain overnight, and while Liu Pi did not take the Shannan West Road, he encountered the siege planned by Chisu Renxie, the envoy of the Five Sections in the eastern border of Tubo.

Although because of Guo Rong's sudden rise, Jiannan Province turned from danger to safety, but the Emperor Li Yu took the opportunity to take away several states in the north of Jiannan Province from Jiannan Province.

On the one hand, the imperial court soldiers and horses led by Guo Rong and Li Yu were like a rainbow, and on the other hand, their strength was seriously damaged after resisting the siege of hundreds of thousands of Tibetan troops.

In this case, although Liu Pi was dissatisfied and resentful, he was finally forced to swallow the bitter fruit.

However, at the same time, the seeds of rebellion were planted.

Just when Liu Pi was the most gloomy and dissatisfied, Ju Wenzhen's godson Chen Hongzhi came to Chengdu Mansion and became Liu Bi's guest.

It coincided with the coup d'état of Chisu Rinche and Nima Bazar in the city of Luoqi, which overthrew Zampu, bloodied the Tianzhu sect, and controlled the actual power of Tibet.

Under the tandem of Chen Hongzhi, Liu Pi, the envoy of Jiannanxi (East) Sichuan Jiedu, and Chisu Renxie, the great minister of Tubo, and Nima Bazar, the envoy of the five jiedu of Tubo, got in touch with each other, and gradually colluded together.

However, with the collusion between Chen Hongzhi and Li Shidao, who was plotting against Jiaodong, an anti-Tang alliance across the east and west sides of the Tang Dynasty was gradually formed, which made Liu Bi's restless heart even more uneasy.

It's just that until that time, Liu Pi still had deep concerns about joining forces with the Tubo people and counterattacking the Tang Dynasty, after all, he was a Tang person, colluding with foreign races, and counterattacking the Tang Dynasty, which was a kind of math and forgetting his ancestors, and would be nailed to the pillar of shame.

At this time, Liu Pi got information from Chen Hongzhi's side that Li Shidao not only colluded with other races, but also became the actual controller of the island country, Silla, and Baekje!

After getting this news, in terms of colluding with foreign races, counterattacking the Tang Dynasty, and forgetting his ancestors, Li Shidao obviously became Liu Bi's role model, making Liu

The balance in Pi's heart began to rebel, but Liu Pi still retained the last trace of scruples at that time.

Just when Liu Pi was fighting with himself in the depths of his heart, the Tubo army mobilized by Chisu Rinse and Nima Bazar came to the city again.

Moreover, this time the soldiers came to the city not only with hundreds of thousands of troops from the Tubo people, but also from the soldiers and horses of Nanzhao.

You must know that the last time the Tubo people invaded, because of Wei Gao Yuwei, Nanzhao Guo was on the side of Jiannan Dao, and shared a lot of pressure for Jiannan Dao, otherwise, Liu Pi might not be able to hold on until Guo Rong recovered Longxi and Longnan.

And this time, the Nanzhao people not only came, but under the leadership of the king of Nanzhao, the entire Nanzhao country poured more than 100,000 soldiers from all over the country to participate in the coercion of the Tubo people.

And the joint attack of the Tubo and Nanzhao people became the last straw that overwhelmed the camel in Liu Pi's heart.

The reason why the Tubo people stationed troops on the border, but did not trigger it, in addition to the idea of taking advantage of the Li Tang court and the Hebei feudal town to fight and profit, the more important factor was for Liu Pi.

Compared with other ethnic groups, the Tubo people who had more contact with the Tang Dynasty were good at attacking the city, but compared with the real Tang army, the Tubo people were too poor in attacking the city.

Chisu Rinche, Nima Bazar and other high-level Tubo people knew very well that under the condition that the Tang army had made sufficient preparations, if the Tubo people chose to honestly pull nails one by one in Longxi, Longnan, and Jiannan, the 500,000 army might not even be able to enter Guanzhong.

And breaking through from the inside has clearly become the best option......

As a result, Wei Gao, the successor of Wei Gao, who had shocked Tubo for 20 years and changed hands between Tubo and the Tang Dynasty almost single-handedly, was the current Jiannan (East) Xichuan Jiedu envoy Liu Pi under the pressure of the Tubo and Nanzhao armies, and was dissatisfied with the situation that the imperial court divided the Jiannan and North Provinces, and finally chose to merge with the Tubo people under the tandem of Chen Hongzhi!

With the agreement reached by Liu Pi and Tri Su Rinche and Nima Bazar, a complete plan was formed.

In the plan, the Tibetans would launch an attack on all fronts, and at the same time, Liu Pi would send dozens of capable cronies to act as messengers to go to Chang'an through Dasanguan, confusing Chang'an and deceiving the trust of Chang'an and Dasanguan.

On the way back, he deliberately stopped at Dasanguan, and after taking the gate, he led the Tubo, Jiannan, and Nanzhao coalition troops into the pass, and then divided the troops as quickly as possible.

attack the hinterland of Guanzhong to the east and threaten Chang'an;

to the west to attack Qinzhou from behind, and the Tubo army in front of the flank to take the four states of Longnan;

Attack Xiaoguan from the north from Gyeongju, lead the Tubo soldiers and horses on the north road, and attack Chang'an from the direction of Jingyuan;

Then the three directions go hand in hand, enter Guanzhong, and completely destroy the Li Tang royal family!

Liu Pi, Tri Su Rinche, and Nima Bazar's plan was very good, and at least the first step was to earn the closure of the Great Scattered Pass.

After the combined forces of Tubo, Jiannan, and Nanzhao poured into Dasanguan, they quickly launched and began to frantically attack the defenders in Dasanguan.

It's just that what the anti-Tang coalition forces that entered the Dasan Pass didn't expect was that although the first step to deceive the trust of the defenders and earn the gate was successful, the situation after the sneak attack was different from what they expected.

Guarding the Dasan Pass was the Zuo Guard, one of the twelve guards of the Southern Ya of the Forbidden Army, which was modeled after the Changying Army.

The Fourth Army of the Northern Ya and the Twelve Guards of the Southern Ya imitated not only the establishment, tactics, and discipline of the Changying Army, but also learned many excellent habits of the Changying Army, such as because of Guo Rong, the Changying Army learned the combat readiness duty system of the rabbit in later generations. - One-third, or one-fifth, of the soldiers are always on ready for any eventuality.

The Left Guard of the Forbidden Army, which was responsible for guarding the Dasan Pass, also retained this system, and when the anti-Tang coalition forces entered the pass and began a large-scale offensive, the 800 Left Guards who were on duty for combat readiness quickly entered the battle.

Compared with the previous cautiousness, the anti-Tang coalition army of the brigade maintained a relaxed attitude after entering the customs, and then they loaded the 800 left guards on duty head-on.

In the case of a light enemy, the anti-Tang coalition forces that entered the customs not long ago

, the 800 soldiers who were on duty for combat readiness were beaten by ghosts and wolves, and the first wave of the most violent counterattack even almost directly hit the soldiers and horses who entered the customs back.

Tubo, Nanzhao, and Jiannan kept throwing troops into Dasanguan, and the left guard of the forbidden army also continued to enter the battle under the encouragement of Emperor Li Chun's second son, King Li and Li Yun.

However, there were fewer soldiers and horses on duty for combat readiness, and the number of the left guards of the forbidden army guarding the Dasan Pass was also insufficient, at least compared with the total number of more than 100,000 allied troops in Tubo, Nanzhao, and Jiannan.

With the passage of time, with the continuous investment of troops by the anti-Tang coalition army, the left guard guarding the Dasan Pass gradually became difficult, Rao is so, in the case of Li Wang Li Yun fighting side by side, the left guard still does not retreat.