The Hongyi cannon fired again, and a team of Houjin soldiers carrying the ladder were hit by iron bullets, and fell down in a string with a bang, several Houjin soldiers were instantly stoned to death by iron bullets, and a few were touched by iron bullets, curled up on the ground and howled wolf.

The shotgun of the invincible general Franc came head-on from afar, and the Houjin army, who was carrying the ladder, relied on the thick armor on his body, but did not dodge, and charged forward in the rain of bullets. Several Houjin soldiers, whose faces were hit by projectiles, covered their faces with blood in one hand, and still carried the ladder with the other, staggering to follow the pace of the team. Shotguns are not powerful enough at long distances, they can't break armor, and even if they hit them in the face, they may not be fatal.

As soon as the ladder of the Houjin army was put up on the city wall, the rolling stones on the city wall fell like raindrops, and several Houjin soldiers who had just climbed the ladder were smashed, and even people and stones fell heavily from the ladder and struggled on the ground. Spurred on by the prospect of rewarding first-time climbers, more post-gold soldiers poured onto the ladder.

The defenders on the city wall stretched out their poles and pushed them out with great force on both sides of the ladder, each of which was held by several sergeants together, working together to push the ladder away from the wall. The ladder was pushed vertically, and it swayed high on the ground, and suddenly it exceeded the equilibrium point and spun backwards like a waterwheel. The Houjin soldiers on the ladder jumped down one after another, those who didn't climb high jumped to the ground, limped and dragged their injured legs away, and the Houjin soldiers who didn't have time to jump off the ladder fell to the ground with the ladder, shaking up a cloud of dust, and people were pressed under the ladder and struggled in pain.

"Order, fight with a white flag!" Huang Taiji looked coldly at the siege scene of the Houjin army, and the resentment against Mang Gurtai in his heart became stronger and stronger.

With a trumpet, Dolgon's white-flaged troops began to move. More than a dozen ladders were carried by the bannermen on both sides, and rushed towards the city wall under the cover of the chariots in front. Their ladders had iron barbs at the top, which were not easily pushed open by the poles once they were on the walls.

At this time, a fast horse galloped in front of Huang Taiji, and the leader on the horse turned over and dismounted and knelt down, and bowed to Huang Taiji and reported: "Great Khan, the gunpowder of the Jin merchants has arrived in ......."

Artillery is a weapon for siege. Huang Taiji led the army into the fortress this time, the march was rapid, and there was no artillery, and now the artillery of the Houjin army was captured from the Ming army in the battle, and the source of ammunition was lacking. The iron bullets can still be partially recycled, and the gunpowder is a complete expendable, so this attack on the city of Beijing did not send out artillery attacks.

Hearing the report, Huang Taiji's eyes showed a trace of imperceptible excitement.

"The carts and ladders retreated, and the artillery moved forward to attack." Huang Taiji ordered coldly.

On the city wall, Sun Chengzong, a bachelor in iron armor, and Shen Liangzuo, the eunuch of ceremonies, patrolled around to defend the city and fight. The first wave of attacks of the Houjin army basically did not pose much danger to the defenders, relying on the tall and strong city walls, the confidence and morale of the defenders were relatively sufficient, and the defensive arrangements were also quite orderly, and did not give the enemy any opportunity to take advantage of, Sun Chengzong was satisfied with this.

A group of Ming troops held various instruments in their hands and bent behind the arrow stacks, and the leading Wu Commander nervously observed the movements of the Houjin army from the battlements. A Ming soldier was hit by an arrow in the shoulder, and several soldiers carried him off the city wall with wooden planks.

"Ge Lao ......" looked at the gray-haired bachelor with iron armor, and moistened his eyes.

"Soldiers use their lives!" Sun Chengzong nodded his head and said approvingly.

"Tartar's cannon ......," shouted the commander of the Ming army who was observing the enemy's situation at the battlement.

Sun Chengzong was startled, took a step forward and looked at the battlement, only to see seven or eight artillery pieces pushed out from the Houjin army array under the city, and the muzzle of the black hole was advancing in the direction of the city wall. Behind the artillery, a cart loaded with projectile gunpowder was closely followed.

In the backyard of the General's Palace, the M777 howitzer had been deployed, the plough hoe of the chassis was tightly embedded in the solid ground, and the barrel had been raised at some angles, pointing diagonally at the southwest sky under the cover of tall locust branches.

The barrel of this M777 howitzer is 39 times caliber (the long-range model has 52 times the caliber, and the overall gun weight will increase from 3.745 tons to 12.3 tons of 39 caliber), the M777 howitzer has a caliber of 155 mm, and the barrel of 39 times caliber is 6.045 meters long.

In the distance behind the howitzer, Yang Ming stood behind the tripod and operated a high-precision gyro total station. This Leica gyro-total station is an indispensable measuring equipment for artillerymen, and its role is to accurately determine the direction and calibrate the reference angle for the gun.

The gyro total station uses the angular momentum of the earth's rotation to measure the true north position, which is not affected by the external weather, time and season, and can be used for all-weather and all-day autonomous directional measurement. The advanced gyro total station uses a magnetic levitation support gyroscope, which eliminates the adverse effects of the torsional moment of the suspension belt, and does not require zero observation, and its measurement accuracy can reach a 1 second angle, that is, if it extends 20 kilometers along the measured direction line, its end point error is less than 10 cm.

It took a few minutes to measure the first time to find the north, and Yang Ming took advantage of the gap in the work of the instrument to light a cigarette and smoke.

Xu Ying walked over from the verandah in the backyard, her emerald clothes bringing a touch of spring to the bare locust branches.

"General, the slave family has ordered that no one should enter the backyard......" Xu Ying looked at everything in front of her and said calmly.

"Oh, you're just in time, help me......" Yang Ming nodded approvingly.

"General, but please command." A hint of joy flashed on Xu Ying's face, and people also came over.

Yang Ming held a cigarette in his left hand and hugged Xu Ying with his right hand.

A puff of smoke sprayed on Xu Ying's face, Xu Ying frowned and turned her head to hide, "I hate it, why are you ......"

With a smile, Yang Ming gently kissed Xu Ying on the face.

"General......" Xu Ying's pretty face turned crimson.

"Xu Ying, I like you......" Without waiting for Xu Ying to answer, Yang Ming kissed her delicate lips.

Xu Ying sighed, and her body suddenly softened in Yang Ming's arms, and Yang Ming's hand around Xu Ying's waist could feel a tremor in her body.

The four lips were intertwined for a long time, until the cigarette in his hand burned out and burned his fingers, Yang Ming let go of Xu Ying, but he found that Xu Ying's face was already full of tears.

"What's wrong......? Xu Ying, don't you want to? ”

"General, I will always follow you." Xu Ying had a heartfelt smile on her face. Well, those tears are tears of happiness.

With Xu Ying's help, Yang Ming installed the benchmark according to the direction measured by the gyroscope total station. Long-range aiming is different from shooting at line-of-sight, shooting in the line-of-sight can be done with the M138 elbow sight on the left side of the howitzer to aim at the target, while long-range aiming must be done with the M137 circumferential sight on the left side of the howitzer and the M18 quadrant on the right side through the benchmark to determine the azimuth and firing angle.

Then Yang Ming climbed the locust tree to install a radio antenna.

"General, be careful......" Xu Ying looked up at Yang Ming who was climbing higher and higher under the tree, and shouted with concern.

"IT'S OKAY, LITTLE CASE." Yang Ming grimaced at Xu Ying and continued to climb up. The higher the position of the radio antenna, the farther the distance of communication, and today's task required Yang Ming to install the antenna as high as possible. Almost climbing to the top of the trunk of the locust tree, Yang Ming used a gong wire knife to fix the antenna hoop tightly on the trunk, and then took out the laser rangefinder, leaned out and looked around, looking for the central building of Shunyi City-stone building.

The stone building is a landmark building at the intersection of the North and South Streets and the East and West Streets in Shunyi City, and it is said that it was built in the Tang Dynasty. The stone building is carved from white marble, about three zhang high, the body of the building is like grease, the surrounding is decorated with copper bells, the body of the building is carved with lotus, Buddha statue, dragon, lion, tiger and other ornaments. The chronicle records: "A pillar inserts the sky, the octagonal surrounds, the stone is firm and the color is bright, the pavilion of hope is like jade, the four plates are supported by the coiled dragon, the lion elephant lotus Buddha seat is engraved, the lotus leaf treasure cover is covered, the golden bell is decorated on the side, and the wind moves exquisitely. Han Shuwen of Shunyi Zhixian County in the Kangxi Dynasty of the Qing Dynasty wrote a poem and praised: "The white jade supports the sky and reaches Siqu, and the jade horse drove the cloud car back then." At the end of the millennium, it is difficult to investigate, and the articles of the previous generation are dedicated to the book. ”

This stone building was demolished in 1953 when the road was widened, and then rebuilt on the original site in 1991, and the position seems to have been moved by about 20 meters, which brought a little trouble to Yang Ming's positioning.

"Xu Ying, you can help me remember a number......" Yang Ming reported the number on the laser rangefinder to Xu Ying.

"General, the slave family remembered ......" Xu Ying looked up at Yang Ming, stretching her hands forward, as if she was worried that Yang Ming would fall.

Yang Ming pointed the laser rangefinder at the four corners of the Shunyi city wall, measured the distance, and reported it to Xu Ying to write down.

"Okay......" Yang Ming said as he descended quickly, and when he reached three meters above the ground, he jumped off with a leap, rolled forward beautifully when he landed, and stood in front of Xu Ying with a smile.

"General, you're scared to death the slaves...... Such a tall ......" Xu Ying said with her hand stroking her chest, suddenly as if she had thought of something, with an angry expression on her face, giving Yang Ming a roll of her eyes.

"Hehe......" Yang Ming also seemed to think of something, smiled embarrassedly, hugged Xu Ying, and kissed her on the face a few times.

"General, don't ......, the slave family is going to forget the number......" Xu Ying's body gasped softly in Yang Ming's ear.

Serious matter, Yang Ming let go of Xu Ying, called up the Excel interface of the military notebook, entered the number reported by Xu Ying into the cell, and called up the record of the laser rangefinder and looked at it, this girl has a good memory, not bad! Yang Ming set up several trigonometric formulas to calculate, then switched to the interface of Afaz, called up the satellite map, found the location of the roundabout of the stone building, guessed and corrected the coordinates of the ancient stone building with the calculated data just now, and then according to the angle and distance with the stone building and the city corner, he clicked it on the interface of Afaz with the mouse, and an artillery sign appeared on the interface of Afaz, this is the location of Yang Ming's M777 howitzer - in the satellite map of the previous world, it is on a wide road!

The vicissitudes of life, Yang Ming sighed. inexplicably traveled back to the end of the Ming Dynasty, and he must make a difference in order to live up to his youth.

If you have GPS, you don't have to go so much trouble observing and calculating, just take out your mobile phone, and set the position in a few seconds. Yang Ming remembered the "Positioning-D30" app installed in his mobile phone, which was developed by a Ukrainian artillery officer named Sherstyuk to provide a simple "fire control computer" for Ukraine's old Soviet-made howitzers. Relying on the GPS sensor in the mobile phone, the Ukrainian artillerymen set up the artillery, took out the mobile phone, completed the GPS positioning within a few seconds, and got the coordinates of their artillery. Then enter the coordinates of the target to be shot into the input box of the "Positioning-D30" APP, and the APP can immediately give the azimuth and firing angle required for artillery shooting. Of course, this APP does not take into account terrain data, and simply uses the curvature of the earth to calculate the trajectory, and the accuracy is not too high, but it is already very effective in actual combat, and it has caused a lot of blows to the Russian army.

Later, in 2014, the Russian hacker group "Dream Bear" attacked Sherstyuk's email address, tampered with the "Positioning-D30" version of his blog, and planted a backdoor in the "new version" of the APP. When the Ukrainian artillery downloaded and used the "new version" of the "Positioning-D30" APP, the APP implanted in the back door sent its location to Russia, and the result was that before the Ukrainian artillery fired, the Russian artillery fired. Finally, after August 2014, the Ukrainian army collapsed, and the artillery units that had been proud of their might and suffered so many losses that they had to start a ceasefire the following year.

Retracting his thoughts, Yang Ming took out the RQ-11B "Big Crow" drone backpack and began to assemble the RQ-11B drone.

The RQ-11B "Big Raven" is a smaller version of the "Pointer" UAV, with a length of 0.9 meters, a wingspan of 1.4 meters, and a combat weight of 1.91 kilograms. It is powered by an Aveox 27/26/7 electric motor, powered by a lithium-sulfur battery, and has a capacity dozens of times that of an ordinary lithium battery. The RQ-11B has a small acoustic signature and can hardly hear the sound of the electric motor when flying above 91.44 meters. The mission endurance time is 1~1.5 hours, the maximum cruising speed is 96 km/h, the effective working radius is 12 km, and the practical ceiling is 4572 meters.

The RQ-11B's body is very small and can be carried in a backpack after disassembly. The RQ-11B can be remotely controlled from a ground station or fully automated using GPS route reference point navigation. The drone's controller is a handheld, large video game-like controller, and the display on the handle can display the video and surrounding information from the drone's CCD color camera or infrared camera in real time.

The RQ-11B Big Raven first flew in 2001, began deployment to the Afghan battlefield in 2002, and by 2016 had delivered more than 11,000 units. The RQ-11B UAV costs $35,000 per unit, and each system includes 1 ground control center and 3 UAVs, which are equipped to each platoon-level unit in Afghanistan for battlefield reconnaissance.

Yang Ming connected the feeder of the antenna installed at the top of the locust tree to the drone's controller through the SMA plug. The standard working radius of the RQ-11B is 12 kilometers, and now Yang Ming has extended its working radius to more than 20 kilometers by raising the communication antenna. In the Ming Dynasty, there was no electrical equipment, let alone radio communication, the electromagnetic environment was quite good, there was no interference, even if the antenna was not raised, it was possible to control the flight radius of 20 kilometers.

"Throwing a plane...... Yang Ming grimaced at Xu Ying, ran a few steps, and threw the RQ-11B towards the southwest sky like a paper airplane. The electric motor on the drone buzzed, driving the two propellers to rotate at high speed, soaring into the sky like geese.