Guwon Fortress, a city located at the bend of the border between the upper and middle reaches of the Hansan River, was listed as Silla Xiaojing during the reign of King Jinheung, and its status was equivalent to that of Luoyang, the eastern capital of the Tang Dynasty, and it was the center of the Hansan River valley and the barrier of the southern border of Silla. Pen fun and pavilion www.biquge.info

After Guwon Fortress, to the south is the southern branch of the Taebaek Mountains on the Korean Peninsula, and the backbone and largest mountain range of the south-central Silla Mountains - the Xiaobaek Mountains.

After passing the Xiaobai Mountain Range, it enters the Luodong River basin, and then goes down the river and then along its tributaries to the east, you can go straight to Jincheng, along the way is the prosperity and wealth of Silla, and the source of food and grain is resounding.

As the defenders of Guwon Castle of Silla Xiaojing, there were 8,000 people, and when the Tang army was about to enter the city, the defenders hurriedly recruited the defenders and young men to enter the city to assist in the defense of the surrounding small cities, but because Zhang Shi led the right guard of Yanyun Iron Cavalry to intercept and kill the Silla soldiers and horses who entered the city to help defend the city in just three days, the intention of the general to defend was frustrated, and the defenders in the city only increased to more than 10,000.

Two days later, in addition to Gao Chongde led the Suzaku Guard to defend Hancheng, Su Mingxiu led the Tianshi Army to defend the Haikou to Dongbi and ** line, Cheng Wuzhong led the Chifengwei to guard the Duogu to Azhuzhen and Seng Liang line, and Liu Yongzhen to guard the North Han Mountain to South Han Mountain, Xue Ne led the Yanyun Iron Cavalry Left Guard Army and the Dangdi Army Qi Biguang to capture Gapyeong Langchuan County and did not rush back, Li Yu led the rest of the Eight Guards and Five Armies with a total of 39,000 soldiers and horses and 20,000 Silla troops to surround Guowon Fortress.

After two days of preparation, in front of the Tang Army's large array 90 zhang away from Guoyuan City, more than 80 stone throwing machines shot simple rough stone projectiles to Guoyuan City Tower under the operation of soldiers. A stone bullet weighs 100 catties, and the light is 20 or 30 catties, bombarding the city wall, and the city wall of the earth and stone structure is covered with flying sand and stone cracks.

The 20,000 Silla troops gathered outside the city were under the command of Li Yu, led by Ah Fan Datu, Sha Yan, and Park Jung-wen, carrying a cloud ladder to launch a fierce attack on the crumbling fortress of Guowon City, which had been bombarded by the Tang army's stone throwers.

Ladders were lowered to the walls, and then one by one they swarmed with their swords, and the archers bent their bows at the defenders above the towers to cover the soldiers who climbed the ladders.

At this time, the stone thrower did not stop the momentum of the attack, but replaced the stone bullet with an oil bomb, and advanced more than ten feet, just as the oil bullet was fired into the city.

Both Silla and Daetang were made of wood, and it was a dry autumn day, when an oil bomb suddenly fell on the castle, the oil that exploded in all directions ignited several houses and quickly spread to the surrounding buildings. Within half an hour, a fire broke out in the city, and the people who were suffering ran out of their houses, carrying wooden barrels to fetch water in an attempt to extinguish the fire in their houses.

On the surrounding city walls, the battle was extremely fierce, and the defenders had repelled three successive enemy attacks despite the courageous resistance of life and death. Arrows rained down the city, and the rolling wood and stones smashed down the city against the heads of the besieging enemies, knocking down the ladders on the walls with poles.

In the two-day offensive and defensive battle, there were as many as 7,000 or 8,000 corpses under the fortress, most of which were the corpses of the Silla army besieging the city, but the fortress was still in the hands of the Silla army.

Even though the Tang army concentrated its stone throwers to attack a section of the city wall, the Silla army was unable to resist rebuilding a section of the wall with a mixed civil structure behind the wall before it collapsed.

Ah Fan Datu, Sha Lu, and Park Zhengwen knelt down in front of Li Yu anxiously to plead guilty.

Li Yu waved his hand, reassuring them that this was not a crime of war, but it was actually the Silla army that defended the royal law, and it was difficult for a while.

The Silla army surrendered to attack the city to no avail, and the generals such as Jang Se, who had a high fighting spirit in their hearts, asked the army to attack the city, in order to conquer the fortress as soon as possible.

Li Yu, who did not have many loyal soldiers under his command, did not want to lose the elite in vain, so he appeased the restless generals, and said with a smile: "The siege of the city in the past two days is just an appetizer, by the way, let's see how the city defense of the Silla defenders is." Tomorrow is the time for our army to officially attack, and at that time, let you see the new siege tactics. ”

The generals were confused, what is the new siege method in the mouth of His Highness? Historically, the worst way to siege a city is to attack the city with ants, and the middle is to bombard the city wall with a stone thrower, and the upper one should open the city gate to attack the city.

Li Yu smiled, and didn't explain, so he asked two sacks weighing twenty catties of hemp rope to be taken in and placed in front of the generals.

The generals were puzzled, "Your Highness, what is this bag?" ”

"Do you still remember that day in the palace academy, I watched Immortal Ge's Lei Fa with you? This thing is an improved and enlarged version of Lei Fa through the gunpowder workshop, which I named the explosives bag, which was used to put it in the city gate hole to blow up the couch and shatter the city gate. ”

Rayfa? Explosives packs? The crowd was stunned. Li Wenbai, Liang Chengye and others, who were not present that day, were even more puzzled, and asked others what it was, and Li Yesi introduced the rear to understand the power of the explosive bag in His Highness's mouth, and couldn't help but be overjoyed.

The explosives package has just been delivered in recent days, and when attacking Jin Yuanshu, Li Yu remembered that the explosives package is simple and easy to make, and the power is incomparably great, and it is a good weapon for attacking the city and pulling out the village in the era of cold weapons. So he wrote a letter about the principle of the explosive pack he knew, drew a pattern, and sent someone back to Pyongyang to hand it over to Xin'er, so that he could order the gunpowder workshop to develop it.

According to the idea set by Li Yu in the letter, the gunpowder was granulated to make it fully burned and increased its power, and wrapped it into a rectangular explosive bag with a charge of 20 catties, and tightly wound it with hemp rope to leave a line of fire.

Xin'er sent someone to deliver the 500 explosives bags that had been prepared and prepared, so that Li Yu's confidence in quickly breaking through a big city like Guoyuan City increased his confidence.

As soon as the morning dawned, Li Yu immediately ordered Ah Fan Datu and Sha Lu to lead the army to attack Guoyuan City again, and when the battle between the two sides was at its most intense, the selected 100 elite soldiers each carried an explosive bag and went straight to the east gate of Guoyuan City.

Although the black powder of the Tang Dynasty was instructed by Li Yu to remove the excess ingredients in it, and the ratio of nitrate, sulfur and charcoal was prepared according to 15:2:3, the explosion power was improved, but it was certainly not comparable to the yellow explosives of later generations.

For the sake of safety, Li Yu had no choice but to increase the power of the explosion by putting a hundred explosive packets into the hole in the east gate of Guoyuan City at a time to see how powerful it was.

The soldier holding the explosive bag in his left hand held a shield against the arrows fired by the Silla army, and in his right hand he held the 20-pound explosive bag and ran to the city gate cave and clinged to the city gate.

More than 20 of the 100 people were still killed and injured by the rolling wood and stones of the defenders of the city on the road, and the others picked up the explosive bags in the arms of the dead and wounded soldiers and put them into the city gate hole.

Seeing that everything was ready, the brigade commander in charge of the command had ten explosives packages ignited at the same time, and the others quickly rushed out of the city gate.

The fire flashed in the cave of the east gate of Kunihara Castle, and the closed gate was torn apart with an extremely explosive rumbling sound, and the ground was shaken, as if an earthquake had erupted. Hundreds of Silla soldiers guarding the inside of the city gate were directly blown away, killing and wounding. The walls of the city gate cave have been blown open one after another, as if they are collapsing.

Both the surrendering troops who were besieging the city and the defenders of the city were shocked by the deafening explosion inside the city gate, and they did not know what was happening.

Before the defenders of the city could understand it, the east gate of the cave was suddenly opened, and Ah Yu, who was in charge of directing the attack under the city, was overjoyed, and immediately commanded the whole army to pour into the east gate of the cave.

The gates are broken!

The Silla army in the city watched in amazement as a steady stream of enemy troops poured in from the city gate, and the city that had been fighting for several days was broken by the Tang army.

In order to get the first merit of capturing Guoyuan City, Zhang Shi, under the order of Li Yu, led the right guard army of Yanyun Iron Cavalry to the east gate.

Facing the galloping Tang army iron cavalry behind them, the troops who were pouring in towards the east gate panicked and retreated to both sides to make a passage, and the soldiers who didn't have time to get out of the way were directly trampled into minced meat by the horses' hooves.

After only five breaths of leading the army into the city, Zhang Shi led the army into the city unimpeded.

Three thousand Yanyun iron horsemen rampaged through the city, killing the Silla army that had been hastily organized to defend along the streets.

After the organized defenders of the East Gate were dispersed, and the surrendered army left for Ah Dian Datu was cleared, and Zhang Shibing divided into three ways to capture the North Gate, the West Gate and the South Gate respectively.

At this time, more Tang infantry under the leadership of Li Yesi poured into the city and climbed the tower to chase and kill the Silla army.

The east gate was broken, and the other three gates of Guoyuan City were attacked by Zhang Shi's cavalry from inside the city, and behind the cavalry were more Tang infantry following.

After the surrendering army outside the city learned that the east gate was broken and the friendly army invaded the city, the morale of the original low morale was greatly boosted, and the strength of the siege increased by three points.

In the end, under the internal and external attacks, the other three gates of Kunihara Castle were all broken in less than half an hour, and the defenders either died or surrendered.

The only more than 1,000 cavalry in the city led by the defender of Kuniwon Castle, Da Achechuan, suddenly killed from the south gate under the carelessness of the Tang army that broke through the city, and thousands of soldiers and horses of the Park Jeongwen Division, who had just broken through the south gate, were directly defeated.

Sun Zhengqi, the commander of the Hanqi guard who supervised the battle outside the city, did not expect that there was still a Silla elite cavalry in the city, and hastily led the army to intercept when the army rushed out of the city at the Great Archer River, but not only failed to intercept it, but lost more than 200 soldiers and horses to let him successfully break out of the encirclement.

After Zhang Shi learned the news, he led 500 horsemen who were still around him to chase after him, and caught up with the Great Archer River ten miles south of the city.

Relying on the cavalry under his command to be twice as large as Zhang Shi, Da Archer Chuan turned back to meet Zhang Shi, trying to kill this Tang General to go back and atone for his crimes.

The two armies were connected, and after a desperate fight, Da Archer Chuan watched his subordinates be cut down by the Tang army one after another, but he lost more than half of them in half an hour, on the other hand, the Tang army lost only dozens of people, and regretted that he was too reckless to order a retreat just now.

The Silla army wants to withdraw, how can Zhang Shi let it go? Holding the obstacle knife in his hand, he killed several Silla soldiers in a row, and forced him to the front of the Great Archer River.

Shocked by the courage of the Tang general, Da Archer Chuan was cowardly, and had no intention of fighting Zhang Shi, thinking of a way to get out of the situation, but Zhang Shi saw the opportunity and slashed into his right armpit.

Archie Kawa was in pain, his right hand hanging down at his side as if it had broken a bone, and he turned back in horror only to see a blade shining in the sunlight slashing towards his head.

Zhang Shi slashed down obliquely, and a warm blood spilled to the ground with the traces of the knife in the air, and Da Achechuan opened his frightened and unwilling eyes, and his head rolled to the ground.

Seeing that the commander was dead, the rest of the Silla cavalry scattered and fled, and Zhang Shi led the army to chase and kill three miles before leading the army to return to the original city.