The gunboat slowly stopped. However, the anchor was not dropped and the fire continued to be lit, but the drive train was disconnected.
The current here is gentle, and the captain gives the order of full right rudder. The engineers immediately manipulated the two transmission shafts and connected one of them to power. The gunboat turned around slowly.
At this time, the bow heavy gun of the shallow water heavy gunship was pointed at the hillside in the distance, and the two fixed rotating Gatling cannons on the left and right sides also pointed their muzzles forward.
At this time, the sailors were wiping the cannon and the cannon had cooled down.
On the hillside in the distance, a large number of Mongolian soldiers were gathering. Obviously, Gushi Khan was gathering the defeated troops everywhere. They were going to take on this damn black ship.
They had had enough of the boat's birdiness since early morning.
At that time, there were 30,000 people in Linhe City, and only about 9,000 people ran out. The others were burned to death there. There were still 20,000 people in various camps outside the city. In previous conflicts, more than a thousand people were killed by machine guns and hundreds more were killed by artillery.
Gushi Khan sent out messengers to gather the scattered soldiers and horses, and gathered here to prepare for a good battle with the ship.
Currently, there are many castles on the crescent-shaped plain of Jacket, along the crisscrossing rivers. There are a large number of military fortresses such as Jilucai Castle, Yuhun Ancient City, Sandingzhangfang Ancient City, Linrong Ancient City, Xinhure Ancient City, Gaoquesai Ancient Castle, Shoujiang City, Shuofang County Ancient City, and Woye Town Ancient City.
These ancient cities are remnants of history. Although they are dilapidated, the basic city walls are still there, but many of the internal buildings have collapsed. This time the Mongols from the Desert invaded in large numbers, and each tribe was dispersed to settle in various ancient cities and castles. Pasture lands were divided and cattle and sheep were grazed separately to avoid disputes.
Among them, Linhe City is the largest part, where the leaders of the four tribes are stationed, hoarding all the food and grass. Originally, this place was the farthest to the west, farthest from Jiuyuan City, and was supposed to be the safest. Unexpectedly, Jiuyuan City sent a black ship. The safest place was burned to the ground.
The four leaders on the hill gnashed their teeth. I'm not even ready to run now. It's just a boat, but they don't believe it can't be chewed off.
At this time, on the hillside, there were more and more Mongolians, densely packed cavalry, and in front of them, slaves were nailing wooden planks to the Lele cart. They also caught up with their only more than 100 small Fran machine guns and more than 200 Camel revolving guns.
Yang Fan looked at where they were with a smile, boosting morale and building a shield car. No orders were given.
"Uncle Dingyuan is so calm and calm, it seems that he has defeated them. However, there are many people on the other side. More than 20,000 people have gathered now. It is estimated that they will attack soon." Zhang Wudian said.
"Don't worry, Mr. Zhang, these shield vehicles, Fran cannons, and camel cannons are all useless. They don't know the performance of our weapons at all." Zhang Fan explained with a smile.
"Their Folang machines are all small-caliber, and they are too big for their camels to carry. The camel cannon is not big either. It is basically a large matchlock gun, similar to those big tubes in Japan. The maximum range is more than 300 meters. It's as high as the sky. If you want to hit the target, the effective range is only 200 meters."
"They are now 3,500 meters away from us. Our heavy artillery can hit them at this distance. However, this is the maximum range. They can only be ejected and cannot be aimed directly."
Zhang Wudian said: "If the artillery cannot be aimed directly, it will be difficult to hit the target."
In this era, there are no trigonometric functions and no way to calculate ballistics. It is impossible to predict parabolic trajectories, so it is impossible to aim indirectly.
Therefore, the effective range of artillery is the maximum range of direct aim. Without optical equipment, it is difficult for the human eye to see clearly beyond 200 meters. Even in modern times, those who can easily aim a rifle with the naked eye and hit a target 200 meters away are excellent shooters.
Therefore, after World War II, assault rifles were eliminated, and rifles using high-power fully loaded bullets were used. The effective range of 800 meters like the Mauser 98K has no practical significance. The 7.62X54mm bullet is large and heavy, which also affects the amount of ammunition it can carry.
In fact, the battle basically takes place at a distance of 200 meters to 300 meters. Long range is basically useless. At this range, density of fire is often more valuable than precision shooting. The bullet was replaced with the Soviet 7.62X39mm bullet. The West has also replaced it with several intermediate-power bullets of different calibers. Later, the caliber was reduced and replaced with smaller bullets.
"Mr. Zhang, you are a master of mathematics, but you may not have studied ballistics. Ballistics can be calculated using mathematical formulas. Coupled with the measurement and calculation of climatic factors such as wind direction, wind speed and humidity, it can be indirectly calculated through parabolic ballistics. Aimed.”
Zhang Wudian said in surprise: "Mathematics can also be used in artillery shooting."
Yang Fan said eloquently: "Of course, you see this is a shooting table. In fact, there is no need to calculate it on the spot. The table above has been calculated. Just adjust it according to the distance. You see, I will give you a show. Just face the one on the hillside. How about a cowhide marquee as a goal.”
Zhang Wudian also came over, looked at it for a while and said: "This is not close, it is probably seven or eight miles away. Can the heavy cannon on the bow of the ship hit that far?"
Yang Fan held a hand deep inside, giving a thumbs up, and looked through the glare window. They took turns closing one eye and doing some mental math. Said: "About three thousand four hundred meters. You can hit it."
Zhang Fengyi asked in surprise: "Brother Yang, what's your method? You can calculate the distance with your thumb. Can you teach me. It's really amazing."
Yang Fan said with a smile: "The thumb range measurement used by artillery mainly uses the "eye-jumping method"."
"Based on the fact that the distance between the two pupils is about one-tenth of one's arm length, multiply the measured width of the object on the ground by 10 to get the distance from the standing point to the target."
"When measuring, the observer faces the target, stretches out the thumb of his right hand between the eyes, closes the left eye, aligns the target with the right eye through the side of the thumb, and then observes with the left eye through the same side of the thumb. Remember the left eye With your eyes aligned with the object, estimate the distance between the object and the target, and then multiply by 10 times to get the target distance.”
Zhang Fengyi was dumbfounded. It was so complicated, so complicated.
Zhang Wudian said with a smile: "Xiaoqing, grandpa always teaches you to read more and learn more. You just don't like to read and study. Uncle Dingyuan's method sounds simple, but it requires very advanced mathematical knowledge. . You don’t understand. When you go back, grandpa will teach you the principles and you will understand.”
This method was uniquely created by modern Chinese artillery. This method has a large error and can only be used as a rough estimate. In use, certain practical experience is required.
This method is also called the visual distance method, which is based on the principle of triangle similarity. The length of the arm, the height of the thumb or the pencil held in the hand, and the angle between the line of sight and the top of the thumb or pencil held in the hand are known.
The far target is a tall, fixed mountaintop or an elevated object on a military terrain map. As far as its principle is concerned, it is derived from the principle of trigonometric functions to determine the standing point and target point.
Zhang Wudian is a scholar with profound attainments in mathematics, so he can naturally understand it. Zhang Fengyi is good at wielding swords and swords all day long. If you asked her to learn, she would have run away.
