Why did later generations pay special attention to the mountains and highlands during offensive and defensive wars? It's because for long-range weapons, the barren line has a huge advantage. Condescendingly, it is not only conducive to observation, but also can effectively increase the firing range, and the front is unobstructed, and the enemy's positions are basically covered by fire. And their positions are hidden on the back of the barren line, which is invisible to the enemy, and it also effectively reduces the area of attack. The lower the trajectory of the attacker's long-range weapon, the more obvious this advantage will be, and it will be almost impossible to overcome.

In this era, the only warp weapons that could threaten the back of the barren line were bows and arrows. However, with the power and range of the bow and arrow, the Song army could not consider it at all.

The most rational way for the Cochins to destroy the stone cannon position behind the hillside was to go into the valley and attack behind them. Xu Ping also thought so, so he left Taniguchi for the Jiaozhi people.

As for what's inside the valley, that's another question. Anyway, the key to Xu Ping's desire to keep the Jiaozhi people behind was not the stone cannons on the mountain, these stone cannons were just driving the Jiaozhi people into the valley.

Shi Quanbin had already noticed this row of big guys, he had never seen such a spectacular scene, and he had long wanted Xu Ping to play two cannons to show him, but because the empty cannons would make Xu Ping embarrassed, he didn't bring it up. Now that the other side of the mountain is the Jiaozhi striker, where can I bear it?

After turning around, Shi Quanbin said to Xu Ping: "Yunxing, how far did you say that the Jiaozhi military camp is from us?" I can see their figures swaying, I don't think it's far, right? ”

Xu Ping looked at it and said casually: "More than three hundred zhang, it's not far." ”

Shi Quanbin looked at Xu Ping in surprise: "Can you really see it?" Didn't you say to bluff me? Even though there is a moon in the sky, how can you see clearly when it is night? ”

"Pavilion Chief, you are in the palace every day, unlike me who runs outside every day. It will feel strange. Whether it's day or night, I just look at the people I see in my eyes, and I can't be wrong. ”

"Fifty meters you can see the eyes like black spots, a hundred meters you can see the appearance of a human face, two hundred meters you can see the outline of the head and shoulders, and three to four hundred meters you can see the color of the clothing and the weapons in the hands. Walking and running can be seen at seven or eight hundred meters. ”

Xu Ping was very familiar with the militia training manual in his previous life, and when he went to Langzhou to correct the artillery position and firing range, he specially corrected it, and even the difference between day and night was carefully studied with the artillery soldiers. According to the feeling that he can only see the Jiaozhi soldier Lunguo now, it should be three or four hundred zhang.

Visual distance is amazing to say, in fact, with proper training and mastery of the right method, it is easy to see eight or nine without leaving ten. With the accuracy of the stone cannon, Xu Ping did not even promote the thumb ranging method. It is to let the soldiers see purely with the naked eye, and in only a few days, the soldiers on the top of the mountain who observe the stone cannons can control the distance in front of the mountain to within three zhang by eye.

Just in front of the mountain, some inconspicuous landmarks, such as the big stone shaped like a tiger, one hundred and eighty zhang from the top of the mountain, the lone big banyan tree. The distance is 226 zhang, an abandoned thatched hut. The distance is 278 zhang, and the small waterhole that was encircled by the Jiaozhi people into the barracks is exactly 318 zhang. This has been measured with a ruler a long time ago, and there is no mistake at all, Xu Ping almost drew a coordinate map of the surrounding terrain, and marked the markers.

Speaking of which, Xu Ping didn't pay attention to the marker of the entrance pool in the Jiaozhi barracks circle. Otherwise, it's more accurate.

Shi Quanbin didn't know if what Xu Ping said was true or not, but he didn't know anything about this kind of thing, so he had to believe it.

By the bright moonlight, Shi Quanbin stretched out his head and looked at the Jiaozhi military camp for a while, and said to Xu Ping: "Such a big moonlit night." Why don't you let the stone cannon try to fight the Jiaozhi military camp? See how it works, too. Otherwise, wouldn't it be embarrassing to wait for the arrival of the Jiaozhi army and the result was unsatisfactory? ”

Xu Ping knew that Shi Quanbin just couldn't hold back and wanted to see the excitement, and he didn't hide it from him when he arranged the artillery test firing at that time. However, this kind of thing is irrelevant, and it is not good to dismiss the thoughts of the people around the emperor, so he nodded and said: "It's okay, at this time, the Jiaozhi people should have just started to rest, so you might as well scare them." ”

Calling Lu Fang over, Xu Ping asked him: "How far is the Jiaozhi military camp in front of you?" ”

"The officials, if you count from the marshal account in the center of the barracks, it is three hundred and twenty zhang." Lu Fang is the commander here, and this kind of data has long been clearly observed, and it cannot be estimated temporarily.

Xu Ping said: "More than three hundred zhang, the medium stone cannon is just enough to use." You go and arrange people, no more, just shoot a salvo to scare the people and make them unable to sleep! ”

Lu Fang promised and ran all the way to arrange.

After a while, Lu Fang came back and asked Xu Ping: "Official, do you want to let the mountains on the other side of the valley come with you?" As long as the fight is good, the barracks under the mountain will be abandoned. ”

"You don't have to, just see the effect. In a few days, when the Jiaozhi army comes, we will give them a lively one! When that time comes, let him not be at peace day and night! ”

Lu Fang secretly said in his heart that it was a pity, if a hundred and ten stone cannons were smashed down together, maybe the people who died in Jiaozhi would be similar to the daytime, and they would dare to approach this mountain for half a step.

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 herald soldier stood next to him, with a big drum in front of him.

Estimating the time, Lu Fang looked at Xu Ping, saw him nodding, and waved the small flag in his hand violently: "Fight!" ”

As the flag fell, the herald's drumstick slammed into the drum.

I heard a loud squeak, followed by a sound of breaking the air from behind the mountain, and a huge stone bullet whistled and flew towards the Jiaozhi military camp at the bottom of the mountain.

The shot came close, landed more than a dozen paces away from the Cochin barracks, and smashed to the ground.

The two cross-toe soldiers who were guarding the watchtower at the camp gate were startled, and they fell to the edge of the watchtower, looked at the dusty ground not far away, and shouted: "What is it? ”

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

Before the words fell, another whistling sound came, and a huge stone projectile crossed the watchtower and smashed straight into the barracks.

This time, the sentry saw it clearly, and hurriedly blew the horn, while one shouted: "Song Army Stone Cannon—"

On the top of the mountain, the soldiers who were observing said to Lu Fang: "Commander, enter the military camp of the Jiaozhi people!" ”

Lu Fang let out a sigh, and the two cannons measured the proper landing point, which was not a shame. It's rare that Xu Ping took Shi Quanbin to watch the battle here, but he can't lose face.

Lu Fang turned to the herald and said, "Ready!" ”

The herald struck twice in a hurry, and there was silence on the top of the hill.

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

The soldier slammed the drum in front of him, and he beat it three times.

In the quiet night, only the creaking sound of the mountain gathered together, endlessly. The stone bullets flying overhead carried a piercing screech, and a gust of wind blew in his life.

In the Jiaozhi barracks, the soldiers who were awakened by the horn scolded and cursed, not knowing what was happening, and only came out of the camp tent with fast movements, and most of them were still in the tent.

Hundreds of huge stone bullets fell from the sky and smashed into the Cochin military camp like a natural disaster. Some of the camp tents were directly hit by stone bullets, and the soldiers who did not have time to get out of it were directly killed. Even if they are out of the camp, even if they are quick and fast, there are not many who break their legs and arms.

All of a sudden, the ghosts and wolves howled in the Cochin barracks, tearing apart the quiet night. (To be continued.) )