The valley that Hong Xiu said was ten miles away, a place called Black Dragon Valley. It is rumored that in ancient times, it was the lair of a black dragon. Hence the name of this valley.

It's close to the border and far from the official roads, so it's rarely visited.

Before it was completely dark, the Sui army finally entered the Black Dragon Valley, and then began the construction of the fortifications at the mouth of the valley.

It must be said that the garrison of Hong Xiuxuan was very advantageous, with straight and steep cliffs on both sides of the valley, surrounding one of the semicircular valleys, although the valley was relatively wide, and there were small streams and mountain springs. But its entrance is very narrow, less than ten zhang wide. As long as they hold this valley well, they will be able to effectively resist the attack of the Koreans.

Although this Sui army was only a baggage unit escorting grain and grass, it was not elite, but it was also experienced in combat.

Under the command of Wei Chi Jingde, they carried a huge stone weighing 100 catties as a barrier. Then three lines of defense were laid out.

Outside the three lines of defense, Luo Cheng sprinkled a lot of thistles, which were a tool to deal with the enemy's cavalry, and there were many spikes on the thistles, as long as the enemy's horses stepped on them, they would be pierced immediately and lose their combat effectiveness.

Then, Yu Wenming proposed that everyone work together, and in front of each line of defense, a deep trench was dug, which was filled with sharpened bamboo pipes, which were ready-made things on the cart and were ready to be used for siege purposes. Now it's kind of come in handy in advance.

By the time dawn, the Sui army's fortifications were complete, and although the sun had not yet risen, there was already light on the eastern horizon.

The stars in the sky are dotted in the night sky, hiding in the faint early spring mist, although the moon has not yet set, but it is still brilliant and clear, like blue flowing water, reflecting the earth.

Yu Wenming also learned from the side knock that Luo Cheng was recommended by his father Luo Yi to serve in Yuwenshu's Zuo Ling Guard.

And Yu Wenshu considered that Luo Yi was currently in charge of the Sui army's grain and grass supply and baggage transportation in Beiping Mansion. Therefore, he simply let Luo Cheng serve as the partial general who escorted the grain and grass. In this way, it is much easier to negotiate with the grain and grass officer. Moreover, in Yu Wenshu's view, escorting grain and grass is also a relatively safe errand and is not easy to have accidents.

He and Luo Yi are both old foxes, and they sent their children and grandchildren to Goryeo, both for the purpose of gilding and earning a military qualification. Naturally, it is impossible to send troops that are too dangerous. Yu Wenshu also planned to transfer all ten of his grandsons to the reserve when the siege war was officially launched. Until the last critical moment, they will not be allowed to rush to the front line.

After leaving enough sentries behind, the rest of the soldiers and civilians began to fall asleep. After all, they had been busy all night without rest, and they urgently needed to recuperate.

While Luo Cheng, Guo Ziyi, Wei Chi Jingde and others inspected the bows and crossbows unloaded from the cart.

Infantry against cavalry, bows and arrows are the most important thing. Because of Luo Cheng, their convoy was escorting grain, grass and war materials. So very well prepared in terms of bows and arrows.

When the Sui army was defending the city, it was no longer an ordinary foot bow, but a powerful bow called a kind of Lianzhu crossbow. It is extremely powerful, with a range of fifty zhang, which is not inferior to ordinary longbows, and the firing speed is at least twice as fast as that of longbows, and it is also very convenient to load crossbow arrows. This is also the reason why the nomads on the steppe often suffer losses when fighting against the Sui army.

At this time, Woo Wenming was sitting on a high boulder, looking into the distance, looking for traces of the Goryeo people.

"Did the guy find anything out of the ordinary?" A crisp voice rang out from behind Yu Wenming.

I don't know when, Hong Xiu appeared behind Yu Wenming.

"Hong Xiu, although I haven't seen the shadow of the Koreans, I have a gut feeling that they have found this place and are pounced on us like wolves." Yu Wenming stared ahead and said in a deep voice.

Yu Wenming's voice carried a manly magnetism, and his pair of piercing eyes seemed to be able to see through the murderous intent behind this quiet morning light.

"Are you scared then?" Hong Xiu asked unconsciously.

"A little!" Yu Wenming replied without evasion. Although he had experienced a battle before, it was only a battle between dozens of people.

And now, more than 1,000 Sui troops, plus more than 3,000 people and 5,000 Goryeo troops, is a big war of 10,000 people. For him, a fifteen-year-old boy, it was deceiving not to be nervous and afraid.

"The first time I killed someone, I was very nervous and scared, but then I got better! According to my father, fifteen years ago, the Koreans invaded our territory like wild wolves, burned down our homes, killed the men of the Northland, and plundered women and children, and my grandfather and mother-in-law died at the hands of the Koreans! So, I want to take revenge on the Koreans in my dreams! Now, I'm finally able to get this chance to go to war! Hong Xiu bit his lip lightly, his eyes full of anticipation.

Only then did Yu Wenming understand why Hong Xiu was so hostile to the Koreans,

"Guy, go down and rest first! Don't be afraid, go to sleep in peace, I'll help you watch it here! Something to inform you! Hong Xiu said with concern.

"No need! I actually take a nap at night. Yu Wenming smiled and said disapprerovingly.

Since he cultivated immortality, his internal strength and physical strength have been longer than those of ordinary martial arts masters.

Hong Xiu nodded, and when he was about to change his position, Yu Wenming's face changed suddenly, and he threw himself into the distance, with a heavy look on his face.

At this moment, a horn suddenly blew on the top of the mountain, making a piercing "woo-woo-" sound, Yu Wenming's pupils shrank, his eyes stared into the distance, and his hand gradually tightened the handle of the Damascus black steel knife.

In the dawn, the overwhelming Goryeo cavalry swooped down on the small valley like vicious wolves, and the sound of horses' hooves of "got, got, go" made this early spring morning change color.

Yu Wenming had already seen at a glance that there were more than 4,000 of these attacking Goryeos. Judging from the direction from which they came, they must have gone down the Xiaoling River, and only killed them along the wheel prints after they did not find the Sui army's grain and grass baggage convoy.

"Rush into the valley and kill everyone except the horses! Burn all the grain, grass and baggage for me! Not a single inch of grass is left! The leader of the Goryeo army shouted loudly.

With his roar, the Goryeo cavalry swept towards the mouth of the valley like a whirlwind, but they soon encountered a setback. Many war horses stepped on the iron thistles distributed by the Sui army on the periphery, the horses' hooves were pierced by iron thorns, the war horses neighed in pain, and one by one they fell to the ground, throwing the cavalry on horseback out heavily, and the screams resounded through the wasteland.

This sudden change caused the Koreans to immediately slow down their advance. They also realized that the Sui army had been fully prepared, and if they wanted to be aggressive, it would not work to raid into the valley.

They dismounted and carefully observed the road ahead, shouted and cursed in a low voice, and proceeded cautiously. After more than an hour, they barely passed through the wasteland outside the valley covered with thistles.

At the mouth of the valley, the Sui army was already in full battle, and three hundred soldiers stood behind the simple stone wall made of stones, holding a crossbow with beads, stretching their bows and arrows, and holding the mouth of the valley.

Other archers, armed with longbows with a longer range, climbed the steep walls on either side and prepared to shoot at the Goryeo army from the top of the mountain.

"Don't worry, the Goryeo army is full of cavalry, and the cavalry has never been good at attacking cities. Today, I want to let them taste the power of our Great Sui Heavenly Army. Luo Cheng shouted loudly. Boost the morale of your soldiers and calm their morale.

"Hmmm! We have sent someone to inform the General, reinforcements will be coming soon! As long as we hold out for a few days, we will be able to defeat the enemy army with reinforcements, front and back! Yu Wenming also raised his arms and shouted.

The Sui army was originally a little panicked when they saw that the enemy was strong. But after hearing the words of his own commander, they gradually settled down. They also knew that if they could defeat several times the number of enemy forces, it would be a great achievement.

"Listen to me later, and then shoot together!" Yu Wenming made a preparatory gesture at this time.

Now his archery skills are very outstanding, and there are no missing arrows within a hundred steps, not only a hundred shots, but also two arrows at the same time. It's just that the force of shooting two arrows at the same time is not as great as when one arrow is fired. However, at close range, it can kill the enemy more than just shooting an arrow.

By this time the sun had fully risen, and the golden light shone on the earth that had begun to melt.

I saw the figures of the Goryeo army rushing towards Taniguchi, because the iron thistles all over the ground hindered their horseback, the Koreans had to give up their horses and rushed towards Taniguchi on foot, ready to attack.

These Goryeo troops were cavalry, so they did not carry shields, but they all carried short bows, long cavalry spears, and broadswords.

Nearly half of them were armoured, stout and tall, and were clearly a hand-picked elite group.

When the Goryeo army passed through the ground of the thistle terrestris and poured towards the mouth of the valley, while roaring, the arrows did not stop, and those arrows kept whistling, although due to the long distance, when they shot in front of the stone wall of the Sui army, they had lost their lethality, and fell to the stone wall of the Sui army's bunker, splashing in all directions, making a sound of "dang, dang".

The curved bow in Yu Wenming's hand had slowly drawn into a full moon, and he held two long wolf's tooth arrows between his three fingers, and the arrows reflected a little cold light in the sunlight, like the smile of death.