Before dawn the next day, Guo Song led 20,000 cavalry to set off, along with 500 cargo ships loaded with grain, grass and materials, the cargo ships will go south to Tongyi County, Meizhou, and then transfer from Tongyi County to Mingshan County, Yazhou by camels, if transported by boat, it is shorter than the direct transportation distance of camels from Chengdu.

The 30,000 new troops left behind in Chengdu will basically not break out in Chengdu, and the role of the new army is more to maintain order.

20,000 cavalry galloped all the way to the south, the reason why Guo Song was in a hurry to rush back to Yazhou City was that he had just received Pei Xin's flying eagle message, the Tang army scouts intercepted several Tubo messengers from the plateau, and the second Tubo reinforcement army was rushing to Yazhou.

20,000 cavalry galloped day and night, galloping towards Mingshan County........

The city of Yazhou was as calm as ever, and the Tang cavalry would come every morning to provoke them, and in the evening they would collect their troops and return to the camp, which was so every day that the Tubo people turned a blind eye.

The food reserves in the city are quite sufficient, but the people in the city are more miserable, many families are out of food, can only rely on the relief of the Tibetan people, a bowl of porridge at noon every day, barely survive, if it is a strong laborer, the treatment is slightly better, to work for the Tubo people, demolish the house, build a stone fort, the Tubo people want to build a three-story high, covering an area of 60 acres of stone fort as an official office, they need labor.

Zhou Fei and his subordinates are the laborers of the stone fort built, the labor intensity is quite large, every day before dawn to start work, after dark to finish, the salary is not paid, only two meals a day, barely able to eat seventy percent full.

I came back every day and was so exhausted that I fell asleep on the ground.

But Zhou Fei also continued to look for the loopholes of Yazhou City, and in the past two days, he heard a secret thing, the Tubo army seized Yazhou City through the wall, which made Zhou Fei immediately interested.

He was told the news by a young Qiang man who worked as a clerk in a shop and lived at the foot of the western city wall, and he saw a large number of Tibetan soldiers pouring out of a private house, numbering in the thousands, and they immediately attacked the southern city gate.

Zhou Fei immediately realized that this was extremely valuable information, of course a private house could not accommodate three thousand people, there was only one possibility, a big hole was dug in the city wall, and the Tubo army outside the city poured in from outside the big hole.

Today, he took a specific seat in this house from the young Qiang.

Their camp was close to the west of the city, where they were all poor people, with dilapidated houses and many alleys, and the Tibetans set aside an area for them to live in, and there were Tibetan patrols on all sides, which were very well guarded.

If they had just lived here, Zhou Fei really couldn't find a way to get out, but they had been living there for almost a month, and they were all familiar with this area, and they knew it well, and there were at least three loopholes that Zhou Fei could take advantage of.

At night, the snoring in the house was like thunder, Zhou Fei jumped up, beckoned, and the two subordinates immediately got up and followed him out of the back door.

There is a very deep alley behind it, the alley is a dead alley, and there is an empty house next to it that is their latrine, which is stinking here, and the Tibetan soldiers will not approach here.

They were agile and familiar with the terrain, and in a short time they left the Minfu area.

"This should be it!"

They ran to the foot of the western city wall and stopped in front of a private house, with a Tubo flag planted on the courtyard gate, which meant that this courtyard was the territory of the Tubo military, and the people were strictly forbidden to enter, but it was also this flag that made it the only symbol around, so that Zhou Fei could easily find the target.

"General, let me take a look first!"

One of his men was small and child-like, but he was extremely skillful.

Zhou Fei nodded, and his subordinates rushed out like monkeys........

Zhou Fei faintly saw the figure of his subordinate appear on the roof, and disappeared again in an instant, and another subordinate next to him asked in a low voice, "Does the general think there are still Tubo people here?" ”

"Judging from the dust on the gate, there should be no more, just in case, the Tubo people don't enter and exit through the courtyard gate, so it's better to be cautious."

"The general said well, we can't have the slightest exposure."

At this time, his subordinates appeared on the courtyard wall and beckoned to them, Zhou Fei was overjoyed, and rushed over with his subordinates, easily jumping into the courtyard.

The house was indeed deserted, there were no Tibetans living in it, the door was locked from the outside, and they jumped into the house through the window, and walked all the way in, until they came to the innermost room.

Zhou Fei immediately noticed that there was no window in this room, and it was pitch black, at this time, his subordinates uncovered a few pieces of the roof, allowing a few rays of moonlight to shine into the room.

Soon, their eyes adjusted to the darkness of the room, and the scene before them became clear.

The room was empty, there was nothing, only two cupboards, since Zhou Fei guessed that the Tubo army entered through the wall, then behind the two cabinets must be a passage.

He stepped forward to push the cupboard with all his might, and his men hurriedly stepped forward to help, and the two cupboards creaked open, and a large hole appeared in front of them.

The large cave is full of stones, almost half of the cavern is occupied, and the roof and supporting pillars on it have not been removed, which means that the city wall will collapse after demolition.

"Come on! We clear the stones out. ”

Zhou Fei gave an order, and the three of them worked together, and in less than an hour, more than 2,000 stones were cleared out, and the room was full of large and small stones, and a big black hole appeared in front of them.

Although the stones had not been completely cleared, and there was still a layer on the ground, it did not prevent them from entering the cave to check.

Zhou Fei resisted the excitement in his heart and walked into the big hole, "Bang! He squatted down and touched it for a moment, and was surprised and delighted that it was two iron hooks, thin and long, and the soldiers who were scouts knew about this tool, which was specially used to fetch bricks.

Immediately afterwards, Zhou Fei touched a fire sickle, and there was a small cloth bag tied under the fire sickle, which was usually velvet.

"Shichiro, bring the oil lamp from the outhouse!"

Just now they found an oil lamp outside, and there was still light oil inside, but there was nothing to light the light, Zhou Fei was still strange! The flint is something that the Tubo people will not deliberately take away, it turned out to have fallen here.

His subordinates rushed out, and after a while, he ran back with an oil lamp, Zhou Fei twisted it lightly, and the wick on it was still there, 'Click! Click! When the scythe was struck, several sparks fell on the velvet and immediately burst into flames.

Zhou Fei lit the oil lamp, he rose high, and the entire city cave became clear.

The hole is about eight feet high and seven feet wide, and the ground is full of scattered stones, and it will have to be filled back later, so it doesn't need to be cleaned so clean.

The cave is covered with wooden planks above and around it, and four large wooden pillars are on top of these wooden planks, Zhou Fei carefully observed these planks and pillars, he kind of understood why the cave could not be restored, the inside of the city wall was full of mud and sand, as long as any pillar was removed, the mud and sand would gush out and fill the entire cave, but the city wall would probably collapse with it.

"General, there are weapons here!"

Zhou Fei was stunned, looked back, and saw more than a dozen weapons on the other side in the innermost corner, Zhou Fei was surprised and delighted, and hurriedly walked up to take a closer look, there were six spears and seven horizontal knives, all of which were weapons of the Tang army, not short swords of the Tubo people.

"The weapons are good, how could they be left out here?" The subordinate asked, puzzled.

Zhou Fei thought about it and said with a smile: "It is estimated that it is the weapon of the undercover Tubo spies, their weapons are usually hidden here, and the Tubo army enters the city, and they take the weapons of the Tang Dynasty, it is a bit nondescript, so they simply discard them here." ”

"I see!"

The two men happily stepped forward to check the weapons and asked, "General, should we take these weapons with us?" ”

"You can take it away!"

Zhou Fei casually agreed, his mind was already on the wall, he gently groped for the wall tiles, the lime between the wall tiles had fallen off, and the gap seemed very wide, but if there was no light outside, it should have been smeared with mud.

Zhou Fei picked up a horizontal knife at any time and inserted it, but the outside was indeed sealed with soil, and the knife opened with a slight stab.

Use the iron hook to probe in, turn it slightly, the hook will hook the city bricks outside, and the two iron hooks can pull out the city bricks as soon as they are forced.

Zhou Fei knew in his heart, and he smiled: "It's okay, take out the weapon, and we'll restore the original state."

The three of them acted together, filled the stone back into the cave, pushed the wooden cupboard, put the oil lamp back into the distance, and even erased the footprints on the ground, so that the Tibetans would not be allowed to discover that their secret had been exposed.

It was almost three o'clock when they returned to their residence, they dug a pit and buried their weapons, Zhou Fei and the three of them fell to sleep, their eyes closed and they lost consciousness, this night, they were too tired.