Why did later generations pay special attention to the high ground in mountain attacks and defenses? It is because for long-range weapons, the mountain barren line has great advantages. Being condescending is not only conducive to observation, but also effectively increases the range. The front is clear, and the enemy's positions are basically covered by firepower. Their own positions are hidden on the back of the mountain barren line, which the enemy cannot see, and effectively reduces the attack surface. The lower the ballistics of the long-range weapons of the attacking side, the more obvious this advantage is and almost insurmountable.

In this era, the only curved weapons that could threaten the back of the Shanba Line were probably bows and arrows. However, with the power and range of bows and arrows, the Song army could not consider them at all.

If the Jiaozhi people want to destroy the stone cannon position behind the hillside, the most rational way is to enter the valley and attack around the back. Xu Ping also thought so, so he left the entrance of the valley for the Jiaozhi people.

As for what is in the valley, that is another problem. Anyway, the key to Xu Ping's attempt to keep the Jiaozhi people is not the stone cannons on the mountain. These stone cannons are just driving the Jiaozhi people into the valley.

Shi Quanbin had long noticed the big guys in rows. He had never seen such a spectacular scene. He had long wanted Xu Ping to shoot two guns for him to see, but because it would make Xu Ping embarrassed, he didn't mention it. Now there is Jiaozhi Forward on the other side of the mountain, how can he bear it?

After walking around, Shi Quanbin said to Xu Ping: "Yunxing, how far are you from Jiaozhi Military Camp? I can see their figures shaking, I think it's not too far?"

Xu Ping looked at it and said casually: "It's more than three hundred feet long, not much far away."

Shi Quanbin looked at Xu Ping in surprise: "Can you really see it? Didn't you say that you were here to scare me? Although there is a moon in the sky, it's night now, how can you see it clearly?"

"People, you are in the palace every day, not like me who run outside every day. You will feel strange. Whether it is day or night, I only look at the Jiaozhi people I see in my eyes, and you will probably not be wrong."

"You can see the eyes as black spots as fifty meters, you can see the appearance of a human face in one hundred meters, you can see the outlines of the head and shoulders in two hundred meters, you can see the color of the clothing and the weapons in your hands in three to four hundred meters, and you can see the movements of walking and running at seven to eight hundred meters."

Xu Ping was familiar with the militia training manual in his previous life. When he arrived in Liangzhou, he adjusted the artillery position and range and even carefully studied the differences between day and night with the artillery soldiers. He could only see the feeling of the Jiaozhi soldiers, which should be three or four hundred feet long.

The visual distance is amazing. In fact, as long as you have appropriate training and master the right method, you can easily see it. With the accuracy of the stone cannon, Xu Ping did not even promote the thumb distance measurement method. It is to let the soldiers look purely with the naked eye. In just a few days, soldiers who observe the stone cannon on the top of the mountain can control the error of the distance in front of the mountain to within three meters.

Just in front of the mountain, some inconspicuous markers, such as the large stone that looks like a tiger, is 180 z. from the top of the mountain, and the lonely banyan tree. The distance is 226 z. The abandoned thatched house is 278 z. The small pool that was circled into the military camp by the Jiaozhi people happened to be 318 z. These were all measured with a ruler long ago, and it would be impossible to make any mistake. Xu Ping almost drew the coordinates of the surrounding terrain and marked the markers.

Speaking of which, Xu Ping has not paid attention to the signs of entering the pool in the Jiaozhi Military Camp. Otherwise, it would be more accurate.

Shi Quanbin didn't know whether Xu Ping was right or wrong, but he knew nothing about this kind of thing, so he had to believe it.

Taking advantage of the bright moonlight, Shi Quanbin stretched his head and looked at the Jiaozhi Military Camp for a while, and said to Xu Ping: "It's such a great moonlit night. Why don't Yunxing let the stone cannons hit the Jiaozhi Military Camp to try? Also see how the effect is. Otherwise, when the Jiaozhi Army arrives, the battle will not be satisfactory, wouldn't it be embarrassing?"

Xu Ping knew that Shi Quanbin just couldn't help but want to see the fun. He didn't hide it from him when he arranged the gun position to test the shooting. However, this kind of thing was irrelevant, and it was not easy to brush the minds of the people around the emperor, so he nodded and said, "Okay, at this time, the Jiaozhi people should have just started to rest, so why not scare them."

Calling Lu Fang over, Xu Ping asked him: "How far is the Jiaozhi Military Camp ahead?"

"If the official figure is calculated from the center of the military camp, it will be 320 feet." Lu Fang is the commander here. This kind of data has been clearly observed for a long time and cannot be estimated temporarily.

Xu Ping said: "More than 300 feet, medium-sized stone cannons are just right. You can arrange people, don't need to be too many, just shoot a volley, scare the Jiaozhi people and make them unable to sleep!"

Lu Fang agreed and ran all the way to make arrangements.

Not long after, Lu Fang came back and asked Xu Ping: "Official, do you want the mountaintops on the other side of the valley to come together? As long as you fight well, the military camp at the foot of the mountain will be abandoned."

"No need, just check the effect. In a few days, when the Jiaozhi army arrives, we will give them a lively time! At that time, he will be in peace day and night!"

Lu Fang thought to himself that it was a pity that if hundreds of stone cannons were smashed down together, maybe the people who died of Jiaozhi were about the same as Bai Tian. It seems that they would dare to get half a step closer to the mountain.

Under the moonlight, Lu Fang stood in the most conspicuous place on the top of the mountain, holding a small flag in his hand, and a commander soldier stood next to him, and a big drum was placed in front of him.

As he guessed the time, Lu Fang looked at Xu Ping, saw him nodding, and waved the small flag in his hand suddenly: "Battle!"

As the flag fell, the drumstick in the hand of the commander slammed on the drum.

There was only a loud creaking sound, and then the sound of breaking through the air came from behind the mountain. A huge stone bullet roared towards the Jiaozhi Military Camp at the foot of the mountain.

The strike was close and landed more than ten steps in front of the Jiaozhi Military Camp, hitting the ground.

Two Jiaozhi soldiers who were watching the camp gate tower were startled and fell to the edge of the tower. Looking at the dusty ground not far away, they shouted: "What?"

Another said: "There are stone bullets! Could it be that the Song army is hitting us with stone guns?"

Before he finished speaking, another whistling sound came, and a huge stone bullet crossed the tower and smashed straight into the military camp.

This time the sentry saw it clearly, and quickly blew up the horn, shouting: "Song Jun Shi Cannon--"

On the top of the mountain, the observer said to Lu Fang: "The commander has entered the military camp of the Jiaozhi people!"

Lu Fang let out a sigh and measured the landing point he deserved in two shots, which was not embarrassing. It was rare that Xu Ping and Shi Quanbin were watching the battle here, so he could not be embarrassed.

Lu Fang turned to the messenger and said, "Prepare!"

The messenger knocked twice in a hurry, and there was silence on the top of the mountain.

"Fight!" The small flag in Lu Fang's hand suddenly fell.

The soldiers suddenly rang the big drum in front of them, and the three consecutive high school slams.

In the quiet night, I heard the squeaking sounds from behind the mountains gathered together, endlessly. The stone bullets flying overhead were harsh and screaming, and a gust of wind blew in my life.

In the Jiaozhi military camp, soldiers who were awakened by the horns were scolded, not knowing what happened, and they only came out of the tent quickly, and most of them were still packed in the account.

Hundreds of huge stone bullets fell from the sky and smashed into the Jiaozhi military camp like a natural disaster. Some camp tents were directly hit by stone bullets, and the soldiers who had no time to come out of the inside were killed directly. Even if they were out of the camp, they didn't know how many of them broke their legs and arms even if they were quick to see each other.
Chapter completed!