It is said that this Helian was ambitious and led the eight departments of Changrong and the three vassal states of Ghost Fang, Qiongfang and Lu Fang, with a total of 250,000 elite soldiers.

Juyong Pass, is the northern fortress of Yunmeng country, the situation is very dangerous, the east is connected with Lulong, Jieshi, the west is connected with Taihang Mountain, Changshan, it is one of the three most majestic and wonderful Xiongguan in the world, and there are two passes respectively in the Shanhaiguan of the moon country and the Dasanguan of Taibai country. Juyong Pass is a place where soldiers must fight since ancient times, it has two passes in the north and south, the south pass is called "South Pass", the north pass is commonly known as "Juyong Pass", it is the gateway to the northwest of Yunmeng country. On both sides of Juyong Pass, the mountain is majestic, and there is a valley of 18 kilometers in the middle, commonly known as "Guangou". Here the peaks and peaks are stacked, the green water flows for a long time, the trees are verdant, the scenery is beautiful, there is the name of "Juyong stacked green", and it is listed as one of the "Eight Views of Yunmeng".

Juyong Pass garrison is the second son of the Fenwu general Fei Yun, General Fei Zhong, Fei Zhong joined the army at a young age, known as a strategy, followed his father to conquer the north and south, killed countless battles, bloody battlefields, and made great achievements, for the Yun Mengguo and for the Fei family to be favored for generations, Fei Zhong did not choose to live in peace and enjoy staying in the capital, but stationed in the Yongguan all year round.

Fei Zhong led the troops, and he was both disciplined and caring for the soldiers defending the city. In the exercise, he got up three watches and slept five watches, and took the soldiers who defended the city to practice three times in summer and three nine in winter. But in life, as long as a soldier is sick, Fei Zhong will definitely personally serve the decoction, guard him to feed him and drink medicine to heal him, and if the soldier's family is in trouble, he will be generous and help him. Therefore, Fei Zhong's ability to hold on to Juyongguan for a long time has a lot to do with the fact that all the soldiers of Juyongguan swear to follow him to the death.

At the beginning, Helian Bobo constantly sent troops to provoke, asking them to loudly insult Fei Zhong's eighteenth generation ancestors before Juyong closed the door, but Fei Zhong was not moved at all; Helian Bobo even sent soldiers to provoke the woman's clothes with spears to humiliate Fei Zhong, scolding him for not even being as good as a woman, but Fei Zhong resolutely retreated; In the end, Helian Bobo pretended to retreat, and Fei Zhong still closed the city gates and did not send troops to pursue him. There are only 100,000 standing garrisons in Juyong Pass, Fei Zhong has been familiar with military books since he was a child, and knows that Juyong Pass is easy to defend and difficult to attack, as long as he can hold on to the arrival of the imperial court reinforcements, he can win a big victory, and once the city gate is opened to face the battle, if the enemy army makes a deception to attack Juyong Pass, the capital is dangerous, so Fei Zhong can ignore personal honor and disgrace, and resolutely not be moved by the enemy.

Seeing that the deception could not be done, Helian Bobo began to attack. On the first day, he ordered the soldiers to use bows and arrows and shields as cover, and then set up a ladder to try to attack the city wall, but Fei Zhong had already prepared a fierce fire oil (oil) on the city wall, when the ladder was erected, and the enemy army was about to attack the wall, Fei Zhong ordered the soldiers to pour down the fierce fire oil, and then ignited it with torches.

The next day, Helian gave up the city and used catapults to attack the city. The principle is as follows: with the help of a mechanical arm, a soldier puts the stone on the catapult, and another soldier lifts the stone through the rotating arm, and then pulls the mechanism, then the stone can fly out directly, draw a beautiful arc in the air, and then smash the city, directly hitting the soldiers and the city wall of Yunmengguo. The soldiers of Yunmengguo had never seen this attack before, and they couldn't react at first, and they suffered heavy casualties, but soon Fei Zhong asked everyone to simply get out of the two lines of defense on the city wall, so that it formed a gap, so that the besieging enemy army could enter through these two openings, and his own side was lying in ambush behind the arrow tower, and when the enemy army poured into the gap in the city wall and was ready to dive into the city, Fei Zhong ordered the archers to draw their bows and shoot, and the enemy army often could only come up with a column of soldiers at a time, and they were all wiped out quickly, so that the enemy troops from the two gaps were broken by each one, At the end of the day, there were casualties on both sides of the enemy, and Helian Bobo had to order his men to rest and recuperate.

On the third day, Helian Bobo launched a thousand chariots out of nowhere, when the curtain on them was uncovered, a stack of iron arrows appeared, Helian Bobo ordered the soldiers to form a formation, a group of four, one holding a shield in front, one carrying a bow-like utensil, one person put arrows into the bow, when the release was over, the fourth person pulled the mechanism, so thousands of feather arrows shot at Juyong Pass.

When Fei Zhong saw it, he secretly screamed that it was not good, this was a long-lost repeater arrow. The general bow and arrow can only be fired with one arrow, and the best bow and arrow in Yunmeng Country can only be fired with three arrows, and it is only available in the palace, called the bed crossbow, as a defense of His Majesty, Juyongguan has no inventory at all, but the crossbow arrows can be ten arrows per arrow. Ancient books record that hundreds of years ago, there was a unified country of Dongyi, this kind of weapon was used when attacking the city, this kind of crossbow arrow is also called Yuan Rong, made of fine iron into an arrow, the arrow body is about eight inches long, it can be fired ten arrows at a time, because the soldiers holding the crossbow are inconvenient to use other weapons at the same time, so the crossbowman is often organized into groups such as "upper crossbow", "entering crossbow", "hair crossbow" and so on under the cover of other soldiers, and fire continuously in turn. But later, Dongyi was afraid that this magic weapon would be used by the enemy, and after unifying the world, all the crossbow arrows were destroyed, and even the manufacturing maps and methods were also cleared, and the world thought that there would never be such a thing as crossbow arrows again. Because its drawings and objects have long been lost, later generations of generals never studied the defense of such crossbow arrows when they studied Wen Taowu. Now that even crossbow arrows have reappeared in the rivers and lakes, I am afraid that it will be difficult for the world to be peaceful.

Due to the need to temporarily dispatch troops and raise food, grass, weapons and equipment, after receiving the urgent document for help from Juyongguan, Wang Chang ordered people to sleep at night, day and night, and must set off as quickly as possible, generally it takes 50 days from the dispatch of troops to the fastest departure, but Wang Chang was worried about Fei Zhong's safety, so he ordered Wang Zizhao and them to set off within 30 days, and Wang Zizhao led the army to set off in 25 days with the assistance of the king of Nanping County, Liu Changlin and Shang Chen.

When the army left Miyun Pass, suddenly a wounded war horse ran in front, someone rolled off the horse, and when the soldiers carried him to Wang Zizhao, they found that this person was seriously wounded. After drinking the water, the person who came came to his consciousness was a little sober, and cried: "Hurry up and withdraw to Miyun Pass, Juyong Pass has been broken, General Fei Zhong has been killed, and he has repaid the country with death!" Then, the man struggled to sit up, handed a bloody letter to Wang Zizhao, and then shouted: "General, the villain has not failed in his mission, and he is willing to return with you!" After saying that, he stabbed a short knife directly into his chest and died on the spot.

It turned out that since Helian Bobo used the repeating crossbow arrows, because the other party quenched the special poison of the ghost recipe on the arrows, there was no antidote to the injured to heal, and Fei Zhong could only watch them slowly suppurate because of the wounds, and finally became infected with the internal organs, and finally died. So the number of defenders of the city dropped sharply, coupled with the fact that there had been no large-scale war for many years, Juyongguan bows and arrows were not well equipped, Fei Zhong used straw rattan and other straw to tie countless straw people, and dismantled the door panels to block the city wall, and then collected the arrows shot by the enemy and the remaining arrows in Juyongguan's original inventory stepped up to make 100,000 rockets (the arrow body was wrapped in fierce fire oil, etc.) to shoot at the enemy, how could the enemy come prepared, although it was delayed for a few days, but Fei Zhong was also seriously injured and carried off the battlefield by his own soldiers, and finally had to order the abandonment of the city, Set up an ambush along the road and retreat to Nanguan.

After breaking through the Juyong Pass, the enemy took advantage of the victory to go south, and then encountered Fei Zhongshe's ambush on the way, but he didn't expect that the Qiong side immediately sent an advance force composed of fire oxen, those sturdy and fat cattle were tied to torches, and after being burned, they ran around wildly, and our side was trampled and burned countless people.

Finally, in front of Nanguan, Fei Zhong's side ran out of ammunition and food, and the two armies met in close quarters in front of the formation, and launched the final hand-to-hand combat, General Fei Zhong suffered an attack of arrow wounds and poisonous sores in front of him, and when he was surrounded by people on all sides, he was unwilling to run away and not want to be captured, so he committed suicide with a sword with hatred and died in his country.