The city wall is 12 meters high, the base is 17 meters wide, the city wall is tall and strong, which is conducive to defense.

Outside the city, one side is the Caiji River that bypasses the north of the city, and the other three sides are flat grasslands.

As soon as Nanning Songtsan arrived in Fuqi City, he felt very depressed - in his intelligence, there was no moat, but in just half a month, a moat with a width of 8 meters and a depth of 3 meters actually appeared.

It turned out that this was excavated by the Second Cavalry Division of the Tang Army led by Ashinahong with the assistance of the Tuyuhun army.

The Tibetan army fought from a long distance and had difficulty in supply, so Nanning Songtsan planned to capture the city of Fuqi as soon as possible and end the war.

Nanning Songtsan brought a large number of craftsmen with the army, captured a large number of Tuyuhun people, and built a large number of siege equipment.

After two days of preparation, the Tibetan army began the siege of the city.

The first problem they had to overcome was how to cross the moat.

The practice of the Tibetan army was to use shield hands as cover, and the soldiers carried a ladder up to 10 meters long on the moat, and then the soldiers holding the wooden planks spread the wooden planks on top and built a bridge to pass.

The attack of the Tibetan army began, tens of thousands of Tibetan officers and soldiers rushed up with ladders, at this time, from the city wall shot a dense rain of arrows, the soldiers of the Tibetan army, basically no armor on their bodies, or had simple leather armor, could not resist the blow of arrows at all.

Before the Tibetan army rushed under the city wall, it lost nearly a thousand men, and the first attack failed.

Nanning Songtsan was not worried, he thought that there were not many arrows stored in the city, so he deliberately sent troops with more shields to repeatedly attack and consume the enemy's arrows.

Unexpectedly, five days passed, and the enemy's arrows seemed to be endless, and they never ran out. Moreover, the enemy also changed his tactics and specialized in striking the Tibetan army, which did not have a shield. In this way, the offensive of the Tibetan army has always been unthreatening.

Nanning Songtsan felt depressed not only this, the camp of the Tubo army would be attacked by a cavalry almost every day, this cavalry came and went like the wind, and specially selected the weak places of the Tubo army to attack.

On this morning, in one of the infantry camps of the Tibetan army, a high platform was erected, and the observation post on it found that a cavalry unit rushed over. He hurriedly blew the horn to call the police.

The Tibetan officers and soldiers came out one after another and fired arrows at the rushing cavalry, only then did they find that the enemy's cavalry horses and knights were wearing armor, and their bows and arrows had little effect, but the arrows fired by the other side easily penetrated their armor.

The Tibetan officers and soldiers were in chaos and looked for places to hide. At this time, the enemy's cavalry came to the wooden fence of the barracks, and several cavalrymen threw out their flying claws, hooked the wooden fence, pulled down the wooden fence with their horses, and then the cavalry of the brigade rushed into the camp.

The officers and soldiers of the Tibetan army were very brave, and they attacked the cavalry with scimitars. The cavalry was condescending on their horses, holding high the long Mo knife, and slashed it fiercely, and even the skin and wooden shield of the Tubo army could be split in half. Splitting on the other party's body, it is basically a knife in two!

That's called a cool!

The 1.1-meter-long scimitar of the Tubo army was simply an ornament, and under the blows of the cavalry, there was no power to fight back.

In less than half an hour, the 3,000 infantry of the Tibetan army in the entire barracks were basically killed and wounded. By the time the cavalry of the Tibetan army arrived, the enemy had disappeared, leaving only the corpses of Tibetan officers and soldiers all over the ground.

This cavalry unit was the reinforced cavalry regiment led by Xue Rengui.

The deployment of Li Su, the king of Liang, was to secretly enter Fuyuhun City with the main forces of the 2nd Cavalry Division and the 4th Cavalry Division of Ashinahun to assist the Tuyuhun army in defense. Xue Rengui led a reinforced regiment (6 battalions) to undertake the task of going out to attack and harass. Du He and Wei Chi Baoqi's special forces are tasked with a decisive secret mission.

After many attacks, the Tibetan army adopted a new garrison method - cavalry on the perimeter and infantry in the inner ring to attack the city.

This also can't help Xue Rengui.

In the afternoon of that day, Xue Rengui's cavalry units appeared again on the flanks of the Tubo army, and this time, their target was the cavalry units of the Tubo army.

A cavalry of about 300 people appeared near the main camp of the Tibetan army, and these cavalry charged towards the large camp of the Tibetan army, and when they reached about 250 meters away from the main camp, they no longer advanced, but only shot arrows into the Tibetan military camp.

The Tibetan army fought back, but their bows and arrows could not reach the enemy, so they gathered more than 1,000 cavalry and attacked the enemy.

When the enemy saw the Tibetan army chasing after him, he rushed wildly towards the way he came. The Tibetan cavalry was in hot pursuit, determined to wipe out these hateful sneak attackers.

The enemy fled into a grassland, and the artemisia grass was half a man high, but it could not hide the figure of the fleeing man, and the Tibetan cavalry pursued closely.

Suddenly, a dense rain of arrows shot from the grass, and the Tibetan cavalry fell off their horses. After three consecutive waves of arrows, countless cavalry stood up in the grass, no less than 5,000 horsemen. They diverged and outflanked the Tibetan cavalry.

The cavalry of the Tibetan army knew that they had been tricked, so the living cavalry fled towards the way they came. However, it was already too late. They were already surrounded by regiments and had to fight desperately with the enemy.

Half a decimal later, the Tibetan cavalry was all annihilated.

Xue Rengui did not stop doing anything, and led the cavalry regiment to rush directly to the camp of the infantry of the Tubo army.

In the camp of the Tibetan army, the soldiers were happy at first when they saw the cavalry coming, thinking that their troops had eliminated the enemy and returned triumphantly. When I saw the person clearly, I couldn't help but be shocked.

Xue Rengui was in silver armor and silver armor, holding a Fang Tian painting halberd, taking the lead, and 5,000 iron horsemen swarmed behind him.

Soon, the Tibetan army camp was full of dead bodies again.

Nanning Songtsan received a report that the infantry had been attacked again, and he took a three-edged armor-piercing arrow taken from the infantry's corpse, and looked at it carefully, feeling that something was a little strange. According to the descriptions of the officers and soldiers who were attacked, the weapon used by the enemy was a strange knife. Although they were wearing Tuyuhun's coat, Nanning Songtsan felt that there were ghosts in it, which seemed to be the shadow of the Tang Army.

The siege of the Tibetan army progressed slowly, and the attack for more than ten consecutive days did not enter the city. During the only night attack, some of the soldiers climbed up to the top of the city, only to be slaughtered by a group of men armed with Mo knives.

Nanning Songtsan felt more and more that something was wrong.

Nanning Songtsan felt the crisis, and he thought that Tuyuhun should have received some kind of help from the Tang Dynasty, otherwise, there would not be so many arrows in the city of Fuqi, and these arrows had quite a lot of armor-piercing arrows, which was not something that Tuyuhun could produce and process.

He carefully analyzed the situation on the battlefield and found a huge danger, that is, a day had passed since the scheduled arrival time of grain and grass, and if his grain and grass could not arrive tomorrow, it meant that the Tibetan army had fallen into the trap of the enemy.

He decided that if he could not fight the city for the last time, he would withdraw his troops immediately.

In this siege, Nanning Songtsam used a cruel poisonous strategy.