Hedong Road is today's Shanxi region, the west is the Yellow River separating Shaanxi Road, the famous Qin-Jin Grand Canyon is even more dangerous, although the Yellow River is frozen in winter and loses the Yellow River's natural danger, but in other seasons it is formed by the Yellow River to form a military dividing line, the west is the Taihang Mountain to separate the Hebei West Road, through the Taihang Eight Mountains to connect Hebei and the hinterland of the Central Plains.

There are many mountains in Hedong Road, such as Heng Mountain, Wutai Mountain, Taiyue Mountain, Zhongtiao Mountain, Luliang Mountain and other mountain ranges divide Hedong Road into Yanbei, Jinzhong, Jinnan and Jinnan several large regions and a number of small basins, in the north of Taiyuan, Heng Mountain and Wutai Mountain form an east-west horizontal barrier, becoming a natural defensive barrier, the first defense line of Hedong Road suggested by Prince Zhao Huan refers to this defensive barrier.

Along this defensive barrier, the Song army has established dozens of cottages and passes in the past hundred years, the most famous pass is Yanmen Pass, the Song army established Yanmen Village here, there are 2,000 defenders, guarding the extremely dangerous terrain, it can be said that one man is the pass, ten thousand people do not open, in addition there is a mound pass in the west, that is, the Lou Fu Pass in the Sui and Tang dynasties, here is the throat pass of the famous Mayi Road.

In the south of these two passes, there are still a lot of military villages, but after nearly a hundred years of armistice between the Song and Liao countries, these military villages are basically in a form, most of them have no defenders, and they are no different from abandonment, and only the two dangerous military villages of Mound Village and Yanmen Village have always maintained the garrison, which is also the first line of defense that the Jin soldiers have to face when attacking Hedong Road.

At this time, the 100,000 troops of the western front of the Jin State had gathered in Datong Mansion, commanded by Wanyan Zonghan, who originally led the Eastern Route Army to attack Yanshan Mansion, but considering that he had defeated the Western Xia army and had a strong deterrent effect on the Western Xia, the wolf lord of the Jin State changed his plan and still appointed Wanyan Zonghan to command the Western Road Jin soldiers.

The Jin soldiers on the Western Road were composed of 100,000 troops, mostly cavalry, including Jurchen, Khitan, Xi, Turkic, Dangxiang, Xianbei and other tribes, of which the core was 30,000 Jurchen elite cavalry, commanded by Wanyan Zonghan himself.

Shortly after the Jin State officially declared war on the Song Dynasty, Wanyan Zonghan ordered Yinshuke to lead an army of 10,000 as the vanguard to attack Yanmen Pass.

Yanmen Pass is located on Gouzhu Mountain, originally a part of the Great Wall, Wutai Mountain is northeast to southwest, stretching for hundreds of miles are cliffs, only in Yanmen Pass there is a slightly lower pass, called Xicheng, cavalry can pass through this pass, the Qin army built a majestic pass on the top of the pass, called Xicheng Pass, that is, today's Yanmen Pass.

Yanmen Pass is actually in the east-west direction, the west is outside the Yanbei Sai, the east is the Daizhou of the Song Dynasty, more than 100 years ago, the Yang family will be responsible for guarding this majestic Yanmen Pass, the Song general who is currently guarding the Yanmen Pass is called Chen Su, originally the general in the division, he led 2,000 people to be stationed in the military village at the foot of the mountain, at this time the vanguard of the Jin soldiers has arrived outside the Yanmen Pass, Chen Su did not dare to be careless, all the 2,000 soldiers were deployed on the Yanmen Pass and the Great Wall on both sides.

At this time, 10,000 Jin soldiers had already set up a large camp outside Yanmen Pass three days ago, but the Jin soldiers did not immediately enter the siege battle, but waited for something?

"General, could it be that Jin Bing is waiting for reinforcements from Yizhou?" One of his subordinates whispered.

Before the Song Dynasty, the Yanmen Pass was held, and Daizhou was basically held, but it was not the case in the Song Dynasty, and the Daizhou of the Song Dynasty also had to guard against the enemy army from the east, the reason was that Yanshan Mansion was controlled by the Liao State, and the Liao army could go from Yizhou to the Flying Fox along the Laishui River Valley to kill Daizhou, and the back of the Song army in Yanmen Pass was exposed to the enemy.

In order to prevent the Liao army from entering Daizhou from the Flying Fox, the Song Army built five military villages near the exit of the Flying Fox, Meihui Village, Magu Village, Bottle-shaped Village, Baoxing Military Village and Yixing Military Village, but at present only the bottle-shaped village has stationed five hundred soldiers, the other four villages are all abandoned, the bottle-shaped village is also a famous pass, called Pingxingguan in later generations, because it is named after the bottle, it is the most important exit valley road of the Flying Fox.

Chen Su was also really worried, hearing that Yizhou had been occupied by the Jin soldiers, and if the Jin soldiers from the east and west were linked, Daizhou would be in danger, he pondered for a moment, and immediately ordered: "Send a letter to Taiyuan quickly, asking Taiyuan to strengthen the defense of the bottle-shaped village." ”

As soon as night fell, the Jin soldiers outside Yanmen Pass finally dispatched, and the Song army detective post on the gate immediately discovered the enemy's movement and sounded the alarm bell, 'Dang! While! While! The rapid alarm bell echoed in the city, at this time, the soldiers were having dinner in the military village, hearing the alarm bell, the soldiers put down their rice bowls, picked up spears and crossbows and ran along the mountain road to the mountain pass, not long after, the main general Chen Su also went to the head of the Yanmen Pass.

"Look, general, the enemy is coming!"

Chen Su also saw that at the foot of the mountain about four hundred steps away, there were countless black shadows, and he immediately ordered: "Send a fireball!" ”

The fireball is made of wheat straw, soaked in fire oil, and has a diameter of eight feet, and it is generally used as a fire during siege or ambush, but in Yanmen Pass, it is used as a flare.

The huge fireball was placed on the three huge stone cannons, and the stone cannons were ejected, and the three soldiers ignited three huge fireballs, and with an order, the three stone cannons were suddenly launched, and the three huge fireballs flew into the air, rolling towards the foot of the mountain, and instantly rushed into the crowd of enemy troops, and also illuminated the range of the enemy army, Chen Su saw that there were about two thousand enemy troops, which was the limit of the number of troops invested in an attack, and it seemed that the enemy army was going to attack the city on a large scale.

"Dump the oil!"

Chen Su gave the second order, and one by one the oil drums were thrown down and fell heavily on the mountain road, and the barrels were suddenly torn apart, and a large amount of fire oil was spilled out, flowing all over the ground.

At this moment, the drums at the foot of the mountain sounded, and two thousand Khitan vanguard soldiers rushed along the mountain road to the top of the mountain.

When running to the city of Guancheng, there are still two hundred steps away, the city also beat the war drums, hundreds of rolling logs smashed into the air, dozens of soldiers in front of them could not dodge, they were smashed out one after another, the flesh and blood were blurred, and suddenly the mountain road was killed, and the soldiers behind were so frightened that they fell down, but there were still rolling logs that hit the enemy soldiers, and the screams came and went.

But the rolling logs subsided a little, and the two thousand soldiers got up again and rushed to the top of the hill with a shout.

"Archery!"

Guancheng and the city walls on both sides suddenly fired arrows, the Song army used all the divine arm crossbows, the killing distance of two hundred steps, but within one hundred and fifty steps can shoot through the enemy's iron armor, for decades, has been the Song army's sharpest weapon against the Liao army and the Western Xia army.

The arrows were dense like rain, shooting into the crowd of enemy soldiers on the mountain road, the enemy soldiers were killed and wounded everywhere, but after a while, the attacking enemy army changed its offensive tactics, they raised large shields in front and left and right, forming three shield walls, withstanding the sharp bows and arrows of the Song army, followed by a round of hundreds of rolling logs tumbling and smashing, the attacking soldiers shouted and crawled on the mountain road.

These Khitan soldiers were specially selected elite soldiers, well-trained, and greatly reduced the mortality rate.

At this time, Chen Su shouted: "Launch the Heaven-Shaking Thunder!" ”

After the battle of Yanjing, the explosion of the powerful earth-shattering thunder gradually spread to the whole army, especially the border army is basically equipped, it is not only an offensive weapon, but also a defensive weapon.

Two soldiers put a fifty-pound earth-shattering thunderbolt on the stone cannon, and the fireman lit the fuse, which sneered and burned, and when it reached the mouth of the pot, the fireman shouted, "Shoot!" ”

'Bang! With a muffled sound, the fifty-pound earth-shattering thunder flew away, drew an arc in the air, landed on the mountain road sixty steps away, and continued to roll and smash into the crowd, just as the earth-shattering thunder just rushed into the crowd, only to hear an earth-shattering explosion, a strong firelight burst out, thick smoke filled, more than a dozen mutilated corpses rose into the air, flying out dozens of steps away.

This earth-shattering thunder killed all the soldiers within ten zhang of the explosion, killing and wounding nearly 200 people, and the soldiers behind were so frightened that they turned around and fled to the foot of the mountain.

In the chaos of the mountain road, the five Khitan soldiers ran against the road, holding their shields high and rushing towards Yanmen Pass.

"Kill them!" The soldiers at the head of the city shouted as they pointed at the five soldiers.

The arrows rained down, and the two soldiers fell in response, and the other three still rushed towards the city without stopping.

Chen Su sneered, he knew what these soldiers wanted to do, they must have wanted to blow up the gate with the earth-shattering thunder, how could it be so easy?

Chen Su waited for the enemy army to rush within 100 steps, and immediately ordered: "Set fire!" ”

Dozens of rockets were fired at the enemy, the ground was already filled with oil, and a raging fire suddenly ignited on the mountain road, engulfing the three Khitan soldiers in an instant, Chen Su shouted: "Get down!" ”

The soldiers squatted down one after another, only to hear a deafening explosion, the earth-shattering thunder carried by the three Khitan soldiers exploded about sixty paces away from Guancheng, and thick smoke rose into the sky, and pieces of minced meat and iron flew away.

The Jin soldiers' earth-shaking thunder came from the Western Xia, and they captured hundreds of earth-shaking thunders made by the Western Xia in the war with the Western Xia army for Xijing, and they also began to use them in siege warfare, but the dangerous terrain of Yanmen made the Jin soldiers' earth-shaking thunder useless.

In the distance, the Wanyan Silver Technique could see the failure of the siege, and he couldn't help sighing, and shouted: "Order to withdraw the army!" ”

'When! While! While! The bell for the withdrawal rang, and the last hundreds of soldiers on the mountain road withdrew like a tide, and the city was suddenly cheered!