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Entering Songzhou City, Li Su immediately felt a tense atmosphere before the war, the people who came and went were all in a hurry, their faces were worried, there was not a single vendor on the street, and heavily armed soldiers appeared from this alley from time to time, and then disappeared in another alley, and the heavy metal crash replaced the usual shouts of the vendors.

"Your Highness, you must be tired, let's go to the Songzhou camp first." Xue Rengui saw that Li Su's face was a little tired, and said.

Li Su shook his head and said, "No, the war is urgent, I'll go to Ximen first to see the stationing of the Tuyuhun army." ”

When Niu Jinda heard this, his eyes showed appreciation, but it was also a flash.

Songzhou is the northwest gateway of the Tang Dynasty, between the territory of Tubo and Tuyuhun, the southwest is Tubo, the northwest is Tuyuhun, Shu is mountainous, especially on the side adjacent to the plateau is the mountain high road risk, this Songzhou is located on the only road to Shu on the Tibetan Plateau, it can be said that it is the throat of the west leading to Shu.

The construction of Songzhou Castle is also based on its military characteristics, sitting in the east and facing west, the west wall is thick and high, and the Songzhou battalion is stationed in the west city, defending against threats from the west at any time.

"At present, there are 1,500 archers, 500 crossbowmen, 3,000 cavalry in the defenders of Songzhou, and the rest are infantry." When he went to Xicheng, Xue Rengui introduced the situation in Songzhou to Li Su, "Now the Tuyuhun army outside the city still has any movement, it seems to be waiting for something." ”

While speaking, Li Su arrived in Xicheng, and there were obviously more soldiers here, and they were very busy, constantly shuttling back and forth, holding arrows, and carrying stones and soldiers abounded.

Niu Jin Dadao then added: "More than a dozen villages outside the city were burned clean by Tuyuhun. Hundreds of people were killed and wounded, and now the people there have all moved into the city, and now Tuyuhun wants to enter the hinterland of Chengdu Prefecture, only to attack the city, otherwise he has to detour more than 1,000 miles from Minzhou. But there are Tang Dynasty heavy troops there, and Murong Fuyun also knows this, so he plans to make a desperate bet, the reason why they are still waiting, I thought they must be building siege equipment. ”

Zhu Youzhi secretly praised Niu Jinda for being a veteran of a hundred battles, and he saw at a glance the reason why Tuyuhun did not attack the city for a long time. He said: "What General Niu said is extremely true. ”

Li Su thought for a while and said, "In this case, we can find a way to destroy all the siege equipment they built." ”

"It's not that we didn't think of this method, it's just that Tuyuhun's army surrounded Songzhou City like an iron bucket, and His Highness will understand it when he goes to the city." Xue Rengui said.

The walls of Songzhou Castle are not high, only about fifteen meters, and they are cast of bluestone. It also looks very sturdy, along the two-meter-wide stairs to the city tower, Li Su's vision suddenly appeared a white tent, vaguely you can see people walking between the tents, Li Su estimated the distance, those tents are at least three miles away from the city wall.

Seeing this, Li Su understood Xue Rengui's words, and he couldn't break through head-on. Both sides of Songzhou City are steep mountains, and you can't get in from the outside, and you can't get out from the inside.

"Rongda!" Li Su called at this time, and Rong Da immediately said, "What does Your Highness command?" ”

Li Su said: "Give me something that you hang around your neck!" ”

Rong Da suddenly took off a metal thing with round holes at both ends from his neck and handed it to Li Su, before leaving, this was specially handed over to him by Li Su for safekeeping.

What Li Su asked Rongda to keep was the Leoper Military Tactical Telescope, which he sold for 60,000 yuan, and in Li Su's opinion, telescopes were particularly suitable for use in ancient times. Because the air clarity at this time is very high, even the naked eye can see far away, but many things in the distance cannot be seen clearly, and the telescope can solve this problem.

Taking the binoculars, Li Su picked it up and observed the Tuyuhun camp three miles away. After adjusting the magnification and sight distance of the telescope a few times, in an instant, every qiē in the Tuyuhun camp was clearly reflected in Li Su's eyes, and even the pockmarks on the soldiers' faces could be seen clearly.

Condescendingly, Li Su could see as clearly as he could see the Qiē in the Tuyuhun camp, the dozing guards, the horses eating forage, and the soldiers roasting their legs of mutton around the fire.

From near and far, Li Su looked at the back of the Tuyuhun camp, between the white tents, he suddenly saw a few children running around, he looked at other places, there were more children and some old people, Zhu Youzhi was right, when the nomads were fighting and migrating, the herdsmen drove cattle and sheep to follow the army, which was the same as the army of the Tang Dynasty, and the people pushed the grain and grass to follow, and the so-called 80,000 people were an imaginary number.

Li Su took this strange thing and did not move at Tuyuhun's camp, Xue Rengui and Niu Jinda both had strange expressions on their faces, and Qin Huaiyu and Zhu Youzhi were very greedy, they learned from some modern books that this is called a telescope, which can bring things in the distance in the field of vision closer, and it is an indispensable thing in marching and fighting.

Knowing the general situation, Li Yu handed the telescope to Zhu Youzhi, Zhu Youzhi observed for a while and then handed it to Qin Huaiyu, at this time Niu Jinda finally couldn't help but say: "Your Highness, what are you doing?" ”

Li Su explained: "This kind of thing is called a telescope, which can see things far away, and is used to observe the enemy's situation. ”

Niu Jinda was still confused, and at this time Qin Huaiyu returned the telescope to Li Su, who pointed the telescope at the Tuyuhun camp and said to Niu Jinda: "General Niu Tong Guò These two round holes look over there and try." ”

Niu Jinda still walked in front of Li Su, leaned his head against the telescope and looked inside, and suddenly, a soldier who was holding a booper appeared in front of Niu Jinda, Niu Jinda was startled, and couldn't help but lean back, and then saw that there was nothing.

"Your Highness, this... What's going on? Niu Jinda was shocked, but Qin Huaiyu and Zhu Youzhi both laughed, Xue Rengui became more and more confused, he looked at it like Niu Jinda, and also showed the same expression as Niu Jinda.

Li Su knew that it was impossible for them to explain the principle in a short time, so he said: "This is a commodity imported from Luo Anguo, and it is a kind of artifact of the craftsman like Muliu cattle and horses, and the effect is what you saw just now." ”

Niu Jinda calmed down a little after listening to Li Su's words, but his heart was still fluctuating, he had fought countless battles in his life, and he instantly understood the effect of this kind of thing on the war, and he was shocked inexplicably.

"Your Highness, can you let me use it again!" Niu Jinda Road.

Li Yu generously gave the telescope to Niu Jinda, "General Niu, please." ”

Niu Jinda took the telescope with both hands as if holding a holy relic, and then looked at the Tuyuhun camp opposite with the telescope, Xue Rengui on the side was also eager, but Niu Jinda was a veteran, he was embarrassed to reach out and ask for it, so he could only wait for Niu Jinda to use it.

At this time, Li Su was thinking about how to break Tuyuhun's attack, his eyes swept over the high mountains on both sides of Songzhou City, and said: "There may not be no paths that can lead to Guò on these high mountains and mountains, Xue Rengui, you now have the soldiers post notices in the city, and offer a bounty to find a path from the mountains to the outside of the city." ”

"Yes, Your Highness!" Xue Rengui answered yes, called a Guoyi Lieutenant, said a few words to him, and the Guoyi Lieutenant took the order and left.

Zhu Youzhi: "Your Highness wants to send elite soldiers to attack the Tuyuhun camp and burn their siege equipment?" ”

"That's right, their morale is booming now, and it is very unfavorable for us to fight now, so it is better to drag it out like this, exhaust their morale and then find an opportunity to destroy the enemy." Li Su said what he thought.

Zhu Youzhi hesitated, "It's just that we can find a path to the outside of the mountain, if you can't find it, this plan is difficult to implement, and even if you find it, you have to spend time to find out where the Tuyuhun siege equipment is, I'm afraid it won't work in a few days, at this time, we might as well take advantage of the night every night to send people to dig a trench a mile outside the city, and let the infantry guard the trench after the trench is dug, if Tuyuhun leads the cavalry to attack, it will inevitably fall into the trench, thus losing the advantage of the cavalry, and then concentrate the superior forces to attack, If Tuyuhun's infantry is close to a trench, they can attack with bows and arrows. ”

Niu Jinda also had enough to steal at this time. Peep hidden, and heard Zhu Youzhi's words: "Trench? What is that? ”

Li Su listened to Zhu Youzhi's words and couldn't help nodding and smiling, I didn't expect this Zhu Youzhi to really learn and use, the method he used actually came from the famous war allusion in Western military history The Battle of the Trench, in 627 A.D. Muhammad met the Meccan nobles with 3,000 men and dozens of horses against the Meccan nobles coalition army of 24,000 men and 600 cavalry, such a disparity in strength, Muhammad listened to the construction of a trench around the outskirts of Medina to defend it, after the battle began, the Mecca coalition cavalry tried to pass the trench several times and were eliminated by concentrating forces, Forcing them to retreat, the defenders used bows and arrows to fire while the infantry approached, and finally succeeded in holding back the coalition forces.

"A trench is a deep and wide earth trench, yes, not only to dig it, but also to dig a few more ways, so that they can fall into this pit and then fall into the next pit." Li Su said, and then the two laughed like two foxes, and Niu Jinda was even more confused.

After discussing the countermeasures, Xue Rengui immediately recruited the people and soldiers, preparing to go out to dig a trench tonight, and at the same time began to collect straw, which was what Li Su asked him to do, since he played Yin to the end, he took the Tuyuhun cavalry by surprise, he asked the people and soldiers to cover the straw on the dug trench, and then covered it with old soil, so that the Tuyuhun cavalry would not notice the storage of the trench, and when they came, they would not all fall down, and they would be disabled if they did not wait for Li Su's soldiers to attack.