On June 16, the Tubo people used crude ladders to launch a large-scale siege without any preparation.
More than two thousand Tibetan infantrymen were divided into a dozen siege teams and ran towards the west wall of Xiping City with ladders.
At various places on the wall, the Tang army generals stared at the rushing Tubo soldiers and shouted loudly to their soldiers.
Said: "Don't panic, hold on steady, don't shoot arrows for now, wait until the Tibetans rush to the bottom of the city wall before shooting.
Our arrows are limited, let me aim before shooting, don't waste the arrows."
Just as more than two thousand Tubo soldiers rushed towards the city wall, some trebuchets at the rear of the Tubo army began to shoot kerosene bombs at the city wall and inside the city.
The rounded stone bullets were moved by the Tubo soldiers to the trebuchets.
Inside the barbed wire pocket, Before firing, a layer of kerosene was poured on the stone bombs, and soldiers held torches to light the kerosene bombs.
Following the command of the Tubo commander, more than a dozen burning kerosene bombs were thrown out and flew into the sky.
Smash it against the city wall or inside the city.
The kerosene bombs flew in a parabolic trajectory, dragging long tails of smoke.
These tails of smoke quickly dispersed in the sky, and the originally clear sky soon seemed to be cast into a shadow.
Standing on the city tower, Zhao Ziliang looked at the kerosene bombs flying from behind the Tibetan army's formation, and said to the generals and officials around him: "As far as I know, the Tubo people never used trebuchets when they attacked my city in the Tang Dynasty.
This thing.
Determination cannot be made by the Tubo people.
It seems that the Tubo people must have captured many craftsmen in the Longyou Army this time."
Cen Shen nodded and said: "What does the commander have?
They don't have many trebuchets now.
If this battle continues, they will have more and more trebuchets.
Then we will be in trouble.
They can grab the trebuchets around them at will."
When the common people work, there is no shortage of people who can operate trebuchets.
Even if the common people don't know how to operate them at first, it is not difficult to learn how to operate them."
Zhao Ziliang said: "We don't have to worry too much.
As long as we hold out for ten days, we can have a decisive battle with Dazalugong after the main army has rested and adapted to the plateau terrain here."
After finishing speaking, Zhao Ziliang ordered: "Give the order to the trebuchet team.
Their enemies are not ordinary Tubo soldiers.
Let them aim at the trebuchet behind the Tibetan army and launch.
It is not difficult to learn to operate the trebuchet, but not everyone can throw it accurately."
Yes, the Tubo people think that just picking some people to operate the trebuchet can cause harm to us.
Then they are totally wrong.
I will not give them the chance to fully learn it.
I will smash one they make. " "Yes, Marshal" Firing a trebuchet is more technical than firing an artillery piece.
It can only rely on operational experience.
The richer the experience, the more accurate the firing.
This cannot be done by just learning for a day or two, or even ten days and a half.
That's right, and the Beiting Army soldiers have been training in the Beiting Army for three or four years, and they came to the Central Plains to fight the rebellion for another five years.
The rich experience of nearly ten years allows the Beiting Army soldiers who operate the trebuchets to easily hit the target. .
The trebuchets of the Tang Army were placed on the mounds close to the city wall.
These mounds were three feet higher than the city wall.
This height allowed the Tang Army observers of the trebuchet unit to clearly see the location of the Tubo Army's trebuchets. .
"Two quarters to the north at a distance of one thousand steps."
The observation soldiers reported the observed distance and direction to the operators.
The launching power of the trebuchet relies on the power generated by the sudden fall of a heavy object.
The torque drives the lever to launch the stone projectiles.
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The length of the torque is fixed.
If you want to increase or decrease the throwing distance, you can only use the increase or decrease method.
This is achieved using the weight method.
Two soldiers continued to add lead and iron blocks to the heavy object frame, while the other two soldiers pushed the main launch lever of the trebuchet so that it faced west and two quarters north.
It was mounted on the trebuchet bracket.
It can freely rotate 360 degrees through the bracket bearing.
It can not only be launched forward, but also can be launched rearward.
The precise scale direction and free rotation function are the characteristics of the siege trebuchet built by the Beiting Army.
This is Other Tang troops did not have it.
"A group of kerosene bombs are ready!"
a Tang Army soldier shouted after pouring kerosene on the stone bullets rolled into the barbed wire pocket and raised the small flag in his hand.
There is a long groove connected to the launch frame of the trebuchet.
There is a long series of stone bullets placed in this long groove.
There is a special valve control to wait for the stone bullets in the launch frame to be launched before putting them down.
A Tang Army soldier opened the valve, and a stone bullet in the long groove rolled into the launch frame.
This was repeated semi-automatically, which not only saved manpower, but also saved time.
"The second set of kerosene bombs are ready."
As the sixteen trebuchet groups were prepared, the flag bearers of all groups raised small flags.
The Tang Army general in charge of commanding the trebuchet group drew his sword and pointed toward the outside of the city, shouting: "Launch!"
The flag bearers of all groups waved the small flags in their hands together.
The Tang Army launcher of each trebuchet team lifted the heavy hammer and smashed the pole supporting the heavy object.
The heavy object fell suddenly, and the powerful kinetic energy brought by the free fall drove the launch frame through the lever.
The launch frame is quickly driven, and the frame The kerosene bombs inside flew out to high altitude with a "whoosh" sound.
More than a dozen kerosene bombs flew into the sky together and fell in a parabola.
Some hit the Tubo army's trebuchets, and some were not far enough and were killed.
A series of Tibetan soldiers, some of them were launched too far and flew too far.
The Tang Army observers in each trebuchet team began to adjust the direction of the weight of the heavy object according to the impact point of the kerosene bomb.
Naturally, there was no need to adjust if it hit.
If there was a deviation, they would start to adjust immediately.
After statistics, three of the sixteen trebuchets hit the target with the kerosene bombs just launched, and the other thirteen more or less missed the target.
This hit rate is already very high, after all, this is a salvo.
The trebuchet unit naturally has its own set of launch and operation regulations.
If it operates and launches according to this set of regulations, it will not only have high efficiency, but also have a very high hit rate.
After four rounds of firing, all eighteen trebuchets behind the Tibetan army were destroyed, and there were also a large number of casualties.
The kerosene bombs thrown by the Tang army not only smashed the trebuchets of the Tibetan army, but also caused a raging fire, and the trebuchets were thrown away.
The wreckage of the plane and the surrounding kerosene were all ignited.
Many Tibetan soldiers were devoured by the crowd and burned in the fire, screaming and miserable.
"Marshal, all our trebuchets were smashed and burned by the Tang army, and even the kerosene was ignited."
The commander in charge of launching the trebuchets of the Tubo army ran over to Dazha Road with a face covered with black gray and a look of fear.
Congratulations on reporting.
Daza Lugong looked very ugly and cursed: "Useless thing, they can hit your trebuchet, can't you hit their trebuchet?
You are really stupid."
Qian Fu Zhan said aggrievedly: "Marshal, it's not that we don't want to do this, it's because the Tang Army's trebuchets fired very fast and accurately.
We only fired one round, but they fired four rounds.
We fired several times but couldn't hit.
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They shot extremely accurately, we are no match at all.
Although our trebuchets were also made by Tang craftsmen, our soldiers are not familiar with the operation of trebuchets."
Dazalugong gritted his teeth when he heard this, waved his hands and said: "Forget it, I don't believe that we can't attack the city without the trebuchet.
Let those Tang craftsmen continue to build the trebuchet and polish the stone bullets."
"Yes, Marshal" A Tibetan general next to him, Dazalugong, said: "Marshal, this Tang army is too powerful.
They defended on the city wall calmly and calmly without any panic.
You see, their soldiers will kill every time they shoot an arrow."
As a soldier, if we follow this method of siege, many of us will die."
Dazalugong said angrily: "Then how can we fight?
There is an immortal Zhao Ziliang.
I have known for a long time that more than ten years ago he killed the great Lunza Dayan and Mangbuzhi of our country here.
At that time, I was serving as a captain of thousands under the command of Mangbu Zhi Da Lun.
The combat power of the Tang army under his command was far superior to that of other Tang armies.
Even so, Today he is surrounded by us in the city and can only defend passively.
Even if there is no heavy siege equipment, we will attack the city.
Their arrows and defensive equipment and supplies are limited.
As long as we use up their arrows, we will Our sons will be able to attack the city wall and send the order to have the 3,000-man team and the 4,000-man team prepare to attack the city."
"Yes, Marshal" The cries of death, screams, and cries for help from up and down the city wall never stopped from the beginning of the battle.
After the siege ladders were set up on the city wall, a steady stream of Tibetan soldiers climbed up from the bottom of the city on the ladders, and were defeated one by one by the Tang army.
The soldiers shot and fell, but the Tibetan troops below continued to follow after the people in front were killed one after another.
If there is only one Tibetan soldier on the ladder, the Tang soldiers on the city wall will kill them with arrows.
If there are multiple enemies, the Tang soldiers will lift thunder stones and smash them down the ladder, so that they can hit a long string of enemies.
The cost of the Tibetan army's attack on the city was heavy.
In less than an hour, five to six hundred people were killed, and many others were injured.
More than two thousand people were almost destroyed in half.
This forced Dazalu Gong to order The first siege team rushed over and replaced the remaining people in the first wave.
They fought for more than two hours.
The remaining people in the first siege team were very tired and had lost their energy.
It was impossible to continue the fight.
Hit the city wall.
"Commander, the Tubo army has been replaced," Wang Zhen pointed to the outside of the city and shouted.
Zhao Ziliang saw it and immediately said: "Since they have changed people, we will also change people and order the next group of people to take over immediately at the city wall."
"Yes, Marshal" The second group of troops quickly climbed up the city wall to replace the first group of defending troops.
Although the Tibetan army suffered heavy casualties, the Tang army was not easy at all.
There were inevitably casualties in the melee.
Some died from stray arrows, and some were shot by arrows.
The Tibetan army stone bombed They were killed or burned to death, but calculating the casualty ratio, the Tubo casualty ratio was more than seven times that of the Beiting Army.
After the battle, only dozens of people were killed by the Beiting Army.
These were all shot by stone bullets or arrows.
Killed, only thirty others were injured
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