After a while, there was a report from the pro-soldiers in the courtyard: "Governor Qiyu, report that the soldiers are coming!" ”

"Bring him in!"

The soldiers led the messenger into the room, and the messenger knelt down on one knee and saluted, "Sent by General Yao, I have come to report to the governor!" ”

"What's the emergency?" Guo Song asked.

"We found that the Tibetans had increased their troops in the Dadou Ba Valley, and a small team of outposts appeared at the mouth of the valley."

After speaking, the messenger presented Yao Jin's letter to Guo Song, Guo Song took the letter and read it, the letter said that Tubo had increased a large number of troops to Dadou Tugu, and it was estimated that the number of troops was no less than 10,000, and it was likely that an attack on Gukou would be launched in the next few days, and it was hoped that Zhangye City would also raise its vigilance.

Guo Song put away the letter and asked, "Do the spies in Tubo appear frequently?" ”

The messenger hurriedly said: "Governor Qiqi, the Tubo spies appear every day, at most four times a day, and there has never been before. ”

"How do you know that Tubo has increased its troops in the valley?" Guo Song asked again.

"A few days ago, several Qiang herdsmen who went to Hehuang to exchange salt came out of the Dadou Pull Valley, they were Qiang people from the Black Mountain Department, and they came to tell us that Tubo had increased its troops in the Great Bucket Pull Valley."

"Black Mountain?"

Guo Song was suddenly in a trance, he remembered that he practiced archery at Xiutu Lake many years ago, and the one who lived with him was not the Black Mountain Department? There are also Sister Ying and Chief Pu, who actually forgot about them.

In fact, Guo Song has not forgotten that in fact, he has been busy since he came to Ganzhou, and he didn't even have time to stop to catch his breath, and he didn't have the opportunity to recall the past.

Guo Song pressed back the thoughts that were rushing out, and said to the messengers: "You go back immediately and tell General Yao that they should be highly vigilant, and I will immediately increase troops to Taniguchi." ”

.........

Early the next morning, Guo Song Linglang led Yang Miao and the heavy infantry commander Kang Bao to lead the heavy crossbow army and the Modao army to the Dadou Bagukou for reinforcements, and at the same time ordered Zhonglang to lead Zhang Tuo to lead 2,000 cavalry to escort the heavy crossbow army and the Modao army forward, this increase in troops, so that the Tang army in the Dadou Bagukou increased to 9,000 people.

Dadou Ba Valley is located in the southeast of Zhangye 120 miles, is a valley road connecting the Hexi Corridor and the Hehuang area, is also a big gap in the Qilian Mountains that stretches for thousands of miles, the widest point has dozens of miles, the narrowest place is only more than 100 zhang, since the Middle Tang Dynasty is a shortcut for Tubo to attack the Hexi Corridor.

After the outbreak of the Anshi Rebellion, the Tang Dynasty had no time to take care of the Western Regions, and drew a large number of troops from the Western Regions, Tubo and Hui took advantage of the weakness to enter, so that the Tang Dynasty lost a large area of territory in the Western Regions one after another, and the Great Dou Tugu was also occupied by Tuyuhun for a time, in order to compete for the Hexi Corridor, Tuyuhun and Shatuo had a major war more than ten years ago, as a result, 30,000 Tuyuhun troops were wiped out, and the Shatuo army also suffered heavy casualties.

The result of this battle was the profit of the fisherman, the Tang army controlled the entire territory of Ganzhou, the Shatuo army retreated to Suzhou, the Tuyuhun people also gave up part of the occupation of Ganzhou, and retreated to the Dadou Bagu, the Tang army established the Tuniubao military city at the mouth of the valley, with a permanent army of 500 people.

At present, there are 3,000 garrisons at the mouth of the valley, led by the general Yao Jin, in order to prevent the Tubo from taking advantage of the opportunity of the Ganzhou army to attack Zhangye, the Tang army was particularly vigilant during this time.

At dusk, Yao Jin led dozens of cavalry to patrol in front of the valley, he received a report from the Qiang herdsmen a few days ago, a large number of Tubo soldiers entered the Dadou Tu Valley, and the Tubo army in the valley was close to 10,000 people.

Of course, Yao Jin also knew that the natural conditions in the valley were very harsh, and the snow in June was a common thing, and it was not suitable for the army to be stationed, and it was enough to garrison more than 1,000 people in peacetime, and it was increased to 10,000 people, which was obviously a soldier in Ganzhou.

"General, I haven't seen any Tibetan spies for a day today, it's a bit strange!" One of the lieutenants whispered.

Yao Jinshen agreed, "It is indeed a little strange, but things are abnormal, there will be major changes, and the brothers must be vigilant and ready to fight at all times tonight." ”

"What does the general mean that the Tibetan army will attack us tonight?"

Yao Jin nodded, "Very likely!" ”

........

Night fell quietly, the Tang army began to increase troops to Tuniubao, Tuniubao can garrison 500 people in peacetime, and can accommodate 1,000 soldiers in wartime, the military fort is condescending, just choking the only way to enter and exit from the valley.

Of course, it is okay for the Tibetan cavalry to force their way out of the valley, and at most pay some casualties from the arrows, but the question is, what about the logistics supplies? If the nail of the Tuniu Army Fort is not pulled out, the logistics supply of the Tubo army will not be able to pass, and without the logistics supply, the Tubo army will still collapse without a fight.

The Tang army camp was stationed behind Tuniubao, and when the Tubo army attacked Tuniubao in a big way, the Tang army would continue to reinforce the fort from behind.

At the first watch, a black figure appeared in Gukou, about 2,000 people appeared in Gukou, and now it is impossible to distinguish between Tuyuhun and Tubo, and the equipment and military uniforms of both are completely identical.

In fact, Tubo has completely controlled the Tuyuhun people, in the past, only the commander was a Tubo people, and the Tuyuhun people still formed their own army, and it was easy to have contradictions.

Of course, the treatment and equipment have also improved, and they are no longer as clear as before, but one thing has not changed, any war is led by the Tuyuhun people.

The 2,000 Tubo soldiers who attacked Tuniu Fort tonight are still Tuyuhun people.

A Tibetan commander said in a loud voice to the five hundred soldiers: "According to the rules, the first person to climb the castle will be rewarded with a thousand sheep, and the other soldiers will be rewarded with a hundred sheep as long as they climb the castle!" ”

The path to attack Tuniu Fort is very narrow, and it cannot accommodate a large-scale soldier attack, since it is a sneak attack, use 500 people to take the lead, and once 500 people attack Tuniubao, the other soldiers will press together.

Five hundred soldiers carry simple siege ladders, they wear leather armor and leather helmets, and hold shields and short swords, which is the characteristic of the Tubo army, most of the infantry use short swords, which also affects the Tuyuhun army, and they do not use long weapons much, and the two armies like to fight close to each other when they fight, giving full play to the advantages of short weapons, but if it is a cavalry, they use an eight-foot long short spear.

The armor of the Tubo army is the famous chain mail, but that is only the most core elite Zampu directly under the guard equipment, ordinary soldiers can only use leather armor, pig iron production is a symbol of national strength, the Tang Dynasty pig iron production a year has two million catties, Tubo is still far from this aspect.

"The hour has come, let's go!"

Five hundred Tibetan soldiers under the leadership of a 500 commander touched the valley mouth, a bright moon hung in the sky, sprinkled with silver light on the earth, the eye could reach for miles, under the moonlight, the Tubo army could already faintly see the Tuniubao military city two miles away.

At this time, a thousand Tang soldiers on the castle were already in full array, and the Tang army scouts had discovered that there was a Tibetan army assembled at the mouth of the valley, and the enemy army would inevitably come to attack tonight.

The Tang soldiers were ambushed at the head of the city with crossbows, and only a few Tang soldiers were walking around the city in a lazy manner, and the Tibetans were suspicious, and if they saw a flaw, the attack would be stopped tonight.

Half an hour later, countless black shadows appeared at the foot of the mountain, began to climb up silently, the Tuniu military fort was built on a low hill more than ten zhang high, the military fort itself was only two zhang high, but the hill more than ten zhang high made the castle occupy a condescending advantage.

Yao Jin's eyes were sharp as he gazed at the Tubo soldiers below, who had gradually climbed up the hill, and he quickly estimated in his heart that he could shoot three rounds.

"It's ready to launch!" Yao Jin gave the order to shoot.

'Bang! Bang! Bang! ’

Suddenly there was a rapid bang on the top of the city, and a thousand soldiers got up at the same time and fired at the enemy soldiers with their crossbows.

Like a sudden mountain rain, the Tibetan soldiers were caught off guard, they fell down with arrows, and let out a terrible scream, more than 100 people in front were killed by random arrows, and the Tubo soldiers in the back were frightened, and they all lay on the hills, not daring to move.

This was an instinct to defend against danger, but it gave the Tang soldiers time to wind up a second time, and the five hundred commanders had been shot in the first round of arrows, and several centurions did not know how to advance or retreat, and looked back into the valley.

Torches were lit in the valley, which was a signal for them to retreat, and they immediately shouted: "Retreat!" ”

But as soon as they got up to flee, the second round of crossbow arrows of the Tang soldiers roared, hundreds of soldiers were hit by arrows one after another, rolled down the hill, and the soldiers behind ran desperately into the valley, escaping dozens of steps, the third round of crossbow arrows of the Tang army attacked again, and more than a hundred corpses were dropped, and the remaining less than 200 people fled into the valley in panic.

There was a cheer on the head of the city, it was cheering and mocking, and the Tubo commander was so angry that he jumped like thunder, but he had nothing to do, so he had to swallow the bitter fruit of the failure of this sneak attack.