Qin's steelmaking technology has also been greatly improved, for example, oxygen and hydrogen are blown into the bottom. But it is not easy to smelt steel. The advent of steelmaking began with coal, and the iron ore mining industry began to develop rapidly.

Following the discovery of open-pit coal mines in the north, the Qin State also discovered a lot of open-pit coal near Guyang. Iron ore mining has also begun to increase, and beneficiation has also begun to become one of the indispensable steps in the extractive industry.

It's not just the North. In Taiyuan County, which is now Fenyang, Shanxi, the filial piety generation. The Qin State discovered better coal mines than those in the north by drilling and exploring. Open-pit coal in the north contains large amounts of sulfur. However, the coal mine from the area of Taiyuan County contains a little sulfur. In this way, the Qin state had a second coal mining area. The demand for coal mines began to increase.

At the same time, Zhao also sent additional people to find black soil. Their targets are mainly focused on the two counties of Daidi and Yunzhong. South Korea, which is located at the heart of the Central Plains, cannot prospect for minerals on a large scale like Qin and Zhao. But it can be a great way to do business. They began to sell the coal they had purchased from Qin to Qi and Chu. And coal is also beginning to be recognized by the six countries.

Just when the three countries are actively engaged in commercial trade. The battle between Yan and Qi began to heat up.

King Yan was very dissatisfied with the stagnant fighting between the two divisions. What he wants is the Linzi of Qi State. Linzi. Instead of stopping in front of one trench after another. So the order to attack was issued.

It was not only King Yan who issued the order, but also Hou Sheng, who also issued an order to recover the lost territory as soon as possible. and began to draw a large number of reinforcements to the north to launch an offensive.

Calendar. This state of Qi is close to the border cities of Zhao, Wei, and Korea. His position is far away from Linzi. But Yan Guo chose this place as a breakthrough. Because no one cares if someone is attacking from this inconspicuous place.

But both sides thought of a piece. Yan Guo thought it was a surprise. And Qi Guo is not like this, they choose this place is also in this idea. They wanted to attack from Lixia and attack behind the Yan army by detouring through them. Because of the emergence of trench warfare, the forces of the two sides gradually began to unfold in a line. This becomes a long snake formation. The Qi army also began to choke the head of the snake.

To this end, both sides began a large-scale build-up of troops. The requisition of the Yan army was somewhat slow, with only two brigades of troops. But the number of artillery is very large. There are more than a hundred pieces of artillery of various kinds.

On the Qi side, 50,000 people gathered here. Half of them were reloaded with muskets. Although the operation is not very proficient. But that's enough.

The first to attack was the Qi army.

At night, the Qi army used iron scissors. A wire cutter similar to the modern one. Twist the barbed wire they have set up, and then a small group of people they organized crawled over the barbed wire and crossed the no-man's land to reach the other side's barbed wire money.

Because of the canned food boxes that Yan Jun hung on the barbed wire, this kind of thing will make a noise as long as it is not done well. As a result, the Qi army's squad very lightly twisted the barbed wire. Even so, there are still people who accidentally touch these canned food boxes.

"Bang." A gunshot broke the calm of the night. Yan Jun found out about the situation. And the Qi army is on the side. An officer waved his arms. Numerous siege machines began to ignite the tung oil filled with clay pots and pulled them up with great difficulty. The clay pot was covered with sackcloth, and the flying clay pot rose into the air like a huge fireball. One, two. Three. Countless clay pots appeared on Yan Jun's head at once.

Fireballs kept smashing on the Yan army's position. The clay pot cracked, and the tung oil splashed. Set the Yan troops standing in the trenches on fire. Yan Jun rolled and wanted to extinguish the fire on his body. Taking advantage of this space, the team began to desperately cut through all the barbed wire.

Although the Qi army had a small number of artillery, they had a large number of siege equipment. These siege engines are not accurate. But the firepower coverage is on the mark. Most importantly, his ballistics are curved, similar to howitzers. The Qi army was well prepared for this attack. First, they sent a team to break down the barbed wire. Prepare for a large-scale offensive by the Great Army. Then, put the siege equipment and start the attack. Carry out a "fire cover" of the positions of the Yan army. "Straight shells can't hit targets below the ground. But the siege equipment of the curved shot could attack the Yan army from the top of the head. This is the secret weapon of the offensive prepared by the Qi army.

The Yan army's position was in flames, and many people couldn't take care of people anymore. Instead, they blindly ran away, dodging the flying "cannonballs." And at this time of the Qi army, the war drums began to "roar". The offensive began.

The Qi army began to rush out of the trenches, and they did not attack in a certain formation. Rather, it is a team of 100 people. Go on the offensive. Some of them had spears and some had muskets. They are about to break through the Yan army's defenses.

The team responded well, and the Qi army immediately entered the Yan army trench from the breakthrough of the small team. The Yan army in the trenches was taken by surprise. The power of the muskets in the trenches was greatly reduced. They can only shoot once, and they can't fire a salvo yet. And the Qi army is good at fighting. The Yan army suffered a lot in hand-to-hand combat.

"Hurry up. Hurry up. Reload shells. Rapid-fire, rapid-fire. "The artillery positions of the Yan army have discovered an unexpected situation. They began to reload the shells with rapid fire.

"Sir, where to shoot?" The artilleryman asked.

"No man's land." The artillery officer simply replied. The night was nothing short of a disaster for the artillerymen. They can't see anything clearly. I had no choice but to shoot blindly.

"Bang." Artillery began to fire at no man's land. Then the glimmer of the fireball, they could still feel that no man's land was densely packed with people. It's these dense crowds that they're going to fight.

"Whew." Cannonballs whizzed. A shell exploded accurately in the crowd of attacking Qi troops, and many people fell to the ground. But the follow-up Qi army still advanced. They knew that the only way to do this was to storm the trenches of the Yan army. And they will be able to win.

"Rush." The drums of war kept urging the soldiers to charge. Although the Yan army has artillery. But it's not as powerful as the fireballs emitted by the opponent's siege engines. They were all muskets in their hands, but they could not repel the Qi soldiers who were charging towards them.

"Shoot." The officer kept shouting loudly. They tried to shoot in the trenches, but the approaching Qi forces quickly scattered them. Brutal hand-to-hand combat ensued. Corpses were piled up in the trenches, unable to move forward.

The Yan army could only temporarily transfer the attacking troops. They did not enter the trenches, but waited in front of the next line of defense. The officers understood what their strengths were. That's platoon shooting. Defeat multiple opponents at once. Wipe out the opponent completely.