At midnight, it was dark and I couldn't see my fingers, and the gloomy sky was covered with goose feathers and snow.

Fifty meters outside the trench, some fires were lit for lighting and easy to spot sneak attacks. The soldier leaning on the sandbag suddenly felt the ground tremble. They woke up one after another.

Jiannu all went out to push the shield carts that were transported from the other side of the river, and pushed the remaining twenty or so blowouts and small and medium-sized Furlong machine gun carts. Slowly pressed over, walked to the fire, and the slave soldiers extinguished the fire with snow. Soon the surroundings continued to fall into darkness.

Li Yu and the others heard the horns sounding on all sides of the camp, knew that the enemy had begun to attack, and hurriedly climbed the watchtower, but there was no moon tonight, so they couldn't see anything.

"This can't be done, we can't see it, the firearms can't exert their power, we have to think of a way, we can't wait for them to touch the car." Zhao Ren said.

Let the carpenter make a simple stone thrower out of the felled trees and large iron nails, burn the honeycomb coal we brought, and throw it out. Cut the wood into small pieces and light it, burn it red and throw it out. Li Yu thought about it for a moment and said.

"The lighting problem is a big problem, many soldiers nowadays are malnourished, their eyesight is very poor at night, we have to record it, go back and study it well, we musketeers are very dependent on the climate, strong winds will blow away gunpowder, and muskets cannot be used in heavy rain. It was too dark to see the enemy. When I saw it, I touched my side. The advantages are all lost. Wang Yihui said.

The musketeers in front saw a figure shaking fifty meters away, and was extinguishing the fire, and shot one after another regardless of it, and many figures were knocked down. But the fire was also gradually extinguished.

Immediately after the artillery fired, a large number of shotguns swept out, and by the light of the fire, a hundred musketeers hurriedly fired a salvo. The two guns were fired every 15 seconds, just as the muskets were also loaded, and the enemy in front of them could be seen firing by the light of the fire.

Although a large number of people were defeated, the enemy behind them learned from the rape and crawled forward directly on the ground. Soon they arrived in front of the barbed wire, blocked by the barbed wire, and I don't know how to cross it, and many people's clothes and armor were hung on the barbed wire, unable to move.

"Throw grenades, there's too many people gathered in front of you." Li Yu ordered.

The musketeers behind the carriage immediately threw grenades, and according to the usual training requirements, they should land as far away from the barbed wire as possible, so as not to damage the barbed wire with their grenades.

Boom, under the constant explosions and rising firelight, the groups of Jiannu who were constantly exposed were quickly bombarded by the flintlock muskets of the brown bess flintlock pistol, and fell in pieces.

Due to the strict discipline of Nanao Town during field training, torches are not allowed to be lit, so as not to become the target of the enemy, and it is pitch black inside the car formation, and Jiannu can also see no human figure.

At this time, Li Yiming, an engineer from the shipyard who followed him, came to find Li Yu. The Navy made a lighting device called a calcium carbide lamp searchlight. This time I came to do a night lighting experiment, and the equipment was on the carriage. It has never been useful if there was no chance before.

Li Yu was overjoyed and asked Li Yiming to quickly move the equipment to the watchtower.

Li Yiming quickly instructed his shipyard workers to start assembling the equipment, which was very rudimentary, with a steel drum the size of a gas canister riveted to a semicircular device similar to a small solar electric heater, which was silver-plated and polished to reflect the light and concentrate it in one direction. The outside is closed with flat glass to prevent the fire from being blown by strong winds. There are exhaust holes on it to prevent gas explosions. This one-meter-diameter headlight head can be rotated and pitched.

Calcium carbide lamp, the scientific name is acetylene lamp, which is illuminated by burning acetylene.

Calcium carbide reacts with water. CaC+H2O=Ca(OH)2+C2H2 products are calcium hydroxide and acetylene, acetylene is a combustible gas, and it will catch fire when lit. Calcium carbide can be prepared by calcining with coke and quicklime at high temperature in a furnace. These raw materials can be produced in Ma'anshan.

The composition of the calcium carbide lamp is very simple, the small calcium carbide lamp used in the general household, generally find a large iron container with a cylindrical bowl mouth as the matrix, open at one end, set a slightly smaller cylindrical iron container as the daughter body, at the end of the child body does not open, make a small mouth, rivet a thin tube, the other end of the thin tube, seal the pass, only leave the gas outlet of the same size as the eye of the needle, in order to burn the gas transported from the lamp body, in this way, a simple lamp is made.

The child body is filled with calcium carbide (calcium carbide CaC), and then put it upside down into the mother, and then fill the mother body with water, you will hear the reaction sound of water and calcium carbide, and smell a pungent smell. Then, with a flick of a lit match at the mouth of the lamp, with a bang, the lamp immediately emitted a dazzling light, sky blue, with a whirring sound, the flame appeared very strong, not like a kerosene lamp that could not resist the wind,

The lit calcium carbide lamp is composed of water, iron, and calcium carbide, and it is clumsy to move compared to other lamps. Once the lamp is lit, the gas generated by the calcium carbide must be burned at one time, because the gas in the storage bottle cannot be collected.

The next day, the residue of calcium carbide had to be poured out for the evening when new calcium carbide was installed. The preservation of calcium carbide should also pay attention to drying, otherwise it will be weathered and turned into nothing. Although calcium carbide lamps have many inconveniences, they are still very popular as a lighting tool whose brightness is second only to electric lights.

Li Yiming tinkered for a while, after installing the calcium carbide, to the water, immediately the steel tank sounded a rumbling sound, the gas nozzle in the lamp head began to hiss, the calcium carbide began to react when it met the water to generate acetylene, Li Yiming ignited the gas with a fire fold, bang, a huge flame appeared, and then shrunk into a dazzling incandescent light cluster, Li Yiming quickly adjusted the knob next to it to adjust the size of the flame. After adjusting and closing the glass lid, a blinding pillar of light shone into the darkness in the distance.

The beam of light is only one meter in diameter at the lamp head, and expands to a diameter of more than 50 meters when it reaches a few hundred meters away, and the reaction of calcium carbide and water to make acetylene is the gas source of early electric welding. The temperature of the electric welding is as high as several thousand degrees, the brightness of this lamp can be imagined, the tiger skin post station occupied by the Eight Banners in the distance is illuminated as bright as day, with the lamp head pitching up and down and turning left and right, the Eight Banners soldiers outside the high ground can no longer hide their figures, and they are exposed.