Just when Guo Song and Li Chunlei caused chaos in the city, the Tang army had already taken the opportunity to remove the big rocks blocking the road and carve out a small road, and thousands of Tang troops quickly interspersed, including heavy infantry, heavy crossbowmen and 3,000 cavalry, who were responsible for cutting off the enemy's return route and preventing the Tubo army from the south from moving north to meet them.

At dawn, the 2,000 Tibetan troops in the city finally found that the fresh water was exhausted, and they immediately panicked, without water, they could not support it for a day.

The commander of the Tubo commander in the city had to order to abandon the city and break through, looking south from the city, and did not find the Tang army, two miles ahead is a turn, it is likely that the Tang army has been waiting for them at the turn, the road block boulder under the city wall has been abnormal, but the Tubo soldiers can only be lucky, in fact, they have no choice, either die of thirst, or die in battle, at least the latter still has hope of breaking through.

The small city gate in the south was opened, and two thousand Tibetan soldiers swarmed out, and the Tubo commander took the lead, and the soldiers behind were all infantry, following the main general to the south.

The Tang army scouts immediately reported to the commander Guo Song, who immediately ordered Luo Daxiao: "You lead three thousand spear soldiers to the south of the city and cut off the return of the Tubo army." ”

"Obey!"

Luo Daxiao, who was already gearing up, immediately led three thousand spear soldiers to gallop away.

Guo Song then ordered Captain Chen Li to lead 500 soldiers to reoccupy Tianshi City.

There were no defenders in the city, and five hundred Tang Army soldiers entered the city without hindrance, and replanted the red black dragon banner of the Hexi Army.

At this time, the Tubo soldiers who had just run a few miles away suddenly had a big chaos, and thousands of heavy crossbow arrows were whistling in front of them, even if the leather armor and shield could not resist the penetration of the heavy crossbow arrows, hundreds of Tubo soldiers who ran in front were shot through the body by the dense heavy crossbow arrows, and they fell in a pool of blood, and the leader of the generals and men and horses were shot with more than a dozen arrows, and died tragically on the spot.

A Tibetan 500-man elder shouted, "Kill it!" ”

The remaining more than 1,700 Tibetan soldiers shouted, holding shields and short swords to kill the Tang army in front.

The heavy crossbow soldiers retreated one after another, and a thousand heavy armored infantry appeared, five hundred people in a row, two rows in front and back, like two strong steel walls lying across the canyon, the long Mo knife flashed in the sun, their whole body was covered by iron armor, they couldn't see their expressions, only two eyes shot a fierce gaze.

'Brush! Five hundred Mo knives slashed out together, flashing a dazzling cold light.

The Tibetan soldiers looked at the dense wood-like long knives in front of them, and their hearts were terrified, but they had no choice, either to die in battle or to fight their way out of the encirclement.

"Kill!"

The Tibetan soldiers rushed forward with a wild shout, but they were greeted by a bloody one-sided massacre.

At this time, the heavy crossbow soldiers had been transferred to the rear, and more than a thousand Tubo soldiers who came to meet appeared in the rear, and a thousand heavy crossbows were raised, aiming at the Tubo soldiers who were constantly coming.

"Shoot!" Lang gave Yang Miao an order.

'Click! Click! Click! A series of crossbow machines sounded, and a thousand heavy crossbow arrows roared towards the Tibetan soldiers two hundred paces away, and the Tibetan soldiers fell like weeds that had been cut down.

Without waiting for the heavy crossbow soldiers to prepare again, Li Bing gave an order, and a thousand cavalry, who had already been impatient, came out from both sides of the heavy crossbow soldiers and killed the Tubo soldiers who responded.......

The Mo knife array is like an unstoppable wild wave, advancing layer by layer, this kind of collective army for one person is extremely difficult to deal with, the sword and arrow are invulnerable, uniform, the Tubo soldiers are not facing one person, but countless sharp long knives are chopping together, the Tubo soldiers were killed all over the ground, most of them were split into several sections, the scene was extremely bloody and tragic.

In less than a quarter of an hour, more than 1,700 Tubo soldiers had been killed, and the remaining less than 800 were killed and retreated.

But none of the Tubo soldiers surrendered, they fought desperately, killed a group, and came up again, at this moment, the rear of the three thousand spear army killed, the last hundreds of Tubo soldiers completely fell into a desperate situation, the Tang army flanked back and forth, and the last hundreds of Tubo soldiers drowned in the killing of spears and Mo knives.

The 1,000 Tibetan soldiers who responded to the south were also surrounded by Tang cavalry, and the whole army was soon wiped out.

This interception battle lasted less than an hour, the Tang army at the cost of less than ten casualties, 3,000 Tubo soldiers were killed, the Tang army then went south, the momentum was like a split, at dusk that day, it occupied the entire territory of the Dadou Bagu, and a Tang cavalry took the lead in appearing at the mouth of the valley in the south.

............

Coming out of the big bucket pull valley, there is a big river in front of you, called the Haomen River, the Haomen River is the upper reaches of the Huangshui River, the wide place can reach several miles, the river level is slow, and the narrowest place is only seven or eight zhang, the water flow is deep and turbulent, after the Haomen River it enters the north of Shanzhou, and the west of the big bucket pull valley is the north bank of Qinghai, it is the traditional control of the Tuyuhun people, but now it has been controlled by the Tubo army.

At this time, the main force of the Tubo army has advanced to the east, Shanzhou has become the rear of the Tubo army, Shanzhou city gathered the Tubo army from the Longyou states to capture the young and strong men and women of the Han people, the number of more than 200,000 people, they will be sent back to the Tubo Plateau as slaves after the first stage of plundering the campaign, in addition to a large amount of grain, pig iron, livestock and money, 2,000 Tubo soldiers are responsible for guarding the Han people and materials.

That night, 10,000 Tang troops began to use giant rafts to cross the Haomen River, the east bank of the Haomen River has always been the control of the Tang army, build a large number of forts, military cities, now all abandoned, the army has withdrawn, dozens of forts and military cities have not seen the figure, the Tubo army is limited, after the increase of troops to fight the valley, no longer able to occupy these military cities and forts, the Tubo army directly occupied the more important county seats.

At dawn, 10,000 troops crossed the Haomen River, leaving 1,000 responding soldiers on the west bank, and 2,000 soldiers in the Dadou Ba Valley to guard, Guo Song personally led 10,000 troops to kill the city of Shanzhou a hundred miles away.

The army of 10,000 consisted of 5,000 cavalry and 5,000 infantry, but the 5,000 infantry also rode on horseback.

At this time, the 15,000 Tubo army had been assembled on the north bank of the Yellow River in Lanzhou, and they had received information that Liangzhou and Ganzhou in Hexi had all kinds of resources and populations that they urgently needed, although it was also their plan to occupy Longyou, but that was the second stage of the plan, and in the first stage, they had to plunder enough population and resources in order to support their second phase of operations with war.

But the plan was not as good as the change, and the unexpected intervention of the Hexi army diverted a large number of people and resources before them, making their plan frustrated, Shang Jiezan was greatly annoyed and ordered the army to assemble and prepare for an attack on Liangzhou.

Shang Jiezan was about fifty years old, born in a famous Tibetan family, with a tough personality, he was called a moderate by the Tang Dynasty, but in fact, he was a rational faction, when the Tang Dynasty was not so easy to gnaw down, he advocated recuperation, but when there was civil strife in the Tang Dynasty, when there was an opportunity, he would immediately show his sharp fangs and pounce on the Tang Dynasty without hesitation.

He didn't want to attack Hexi, but the Hexi army snatched a large amount of booty that should belong to Tubo, which made Shang Jiezan unbearable and ordered the army to attack Hexi, he not only wanted to recapture the spoils, but also to plunder Liangzhou.

"The army is leaving!"

Shang Jiezan gave an order, and 15,000 soldiers began to slaughter towards Liangzhou.

.........

In the evening, 10,000 Tang troops from Hexi arrived in a valley ten miles away from Shanzhou City, and Guo Song ordered the army to rest on the spot, and he had to wait for news from the scout commander Zhang Yun.

At about one watch, Li Bing found Guo Song and reported: "Envoy, Zhang Yun's men have come down." ”

Guo Song perked up, and hurriedly sat up and asked, "How many people are there?" ”

"There are eleven brothers, Zhang Yun and the other ninety brothers have all mixed into Shanzhou City, and they seem to have been in contact."

Guo Song nodded, "Bring their leader to see me!" ”

In a moment, two scouts were brought, one of them was their leader, a scout brigade commander, while the other was entering the city with Zhang Yun and escaped when he was sent out to cut wood, and he brought the situation inside the city.

The scout brigade commander briefly reported to Guo Song about Zhang Yun's entry into the city, and then called another scout up and said to him: "You can report to the envoy!" ”

The scout knelt down on one knee and saluted, "Humble to the envoy!" ”

"What's your name, where are you from?"

"The villain's name is Xu Cheng, he is from Shanxian County, Benzhou, and the terrain in this area is relatively familiar, so he can escape."

Guo Song waved his hand to him, motioned for him to get up, and said, "Tell me the details!" ”

The scout stood up and said, "We are divided into the group, it is easier to blend into the ranks of the people, just pretend to be free, but it is difficult to escape, we entered the city at noon, but when we entered the city, each of us was branded with a mark on the shoulder......."

"Show me!" Guo Song Lingdao.

The soldier pulled back his shirt from his shoulder, only to see a black circular mark on his shoulder, which looked shocking despite the fact that it was night.