After the signal flare exploded in the air, a large amount of smoke generated by the violent burning of white phosphorus appeared throughout the sky like silver lightning.

On this side, Lu Jiayu, the general of the Fourth Army of the Imperial Guard, who was marching, was sitting in an iron-armored four-wheeled carriage and looking at the sky in the distance with a monocular telescope.

On this vast grassland, the view is extremely wide, but it is difficult to find a landmark. If it weren't for the pre-arranged direction and compass, Lu Jiayu would really be worried that his Fourth Army and the Third Army would lose contact on this grassland.

At this time, he happened to see the white phosphorus smoke appearing all over the sky, and he also understood that the third army was already retreating and a large number of enemy cavalry were coming.

"The engineering battalion immediately sets up roadblocks, the Feitian battalion is ready to burn bags, the two cavalry battalions go to pick up the third army, the artillery battalion is in place, and the four infantry battalions are ready to fight!"

Lu Jiayu immediately issued an order. His Fourth Army was a complete mixed infantry corps, with a total of 20,000 main force. His combat effectiveness was only slightly worse than that of the First Army of the same infantry corps. The reason for the difference was mainly because his grassroots officers were mainly third-term officers, but compared with other officers of the Ming Dynasty, they were still relatively strong, at least in terms of discipline and execution of orders, they were not comparable to other classical armies.

As soon as Lu Jiayu's order was reached, the engineering battalion immediately carried a large amount of glass slags a hundred steps ahead, and began to place glass slags in an open area of ​​fifty steps and two hundred steps wider.

At the same time, yellow road signs were set up on both sides so that the Third Army would not be obstructed by glass roadblocks when it retreated.

At the same time, the artillery battalion here also began to debug the artillery on the four-wheeled carriage and measure the position of the white phosphorus burning. However, a quarter of an hour before the firing, the commander of the artillery battalion also fired a white phosphorus bomb to inform the Third Army of the Imperial Guard that the bombing was about to begin, and should speed up to avoid being injured by its own artillery fire.

The flying camp composed of hot air balloons and foot-pedal aircraft also began to prepare. After a large amount of methane gas produced by the Royal Academy of Sciences through microbial fermentation was ignited in a special device, a large number of violently burning flames were immediately generated, and the hot air balloon immediately expanded and slowly rose to the sky. Also brought to the sky was a combustion pack filled with a large amount of methane gas.

These flammable gases are mainly methane, but not just methane, but also a small amount of hydrogen sulfide and sulfur dioxide. They are produced by fermenting pig manure as inoculum, which is mainly produced by fermenting methane-producing methanobacterium with waste grains such as fermented rice and vinegar grits as culture medium.

These gases are collected from huge glass and porcelain cans that are fired (the reason why the iron cans are not used is to avoid gas explosions due to friction sparks during transportation)

When marching, these gases will be collected into a cotton bag covered with paraffin, which can enhance the airtightness and be used as explosives bags.

The Flying Camp wrapped in space with burning explosives filled (not fully filled) with methane and other flammable gases, while the foot-pedaled personal aircraft began to prepare to fly into space, with their hands holding bows and ignition devices at any time.

At this time, Mutar had already concentrated 20,000 elite cavalry to surround the Third Army's 15,000 cavalry. They had a great appetite and were preparing to annihilate the Third Army of the Imperial Guard by encircling left and right, in order to avenge their hatred for being massacred by the Third Army.

But the Third Army escaped slipperyly like a loach. When he saw white smoke bombs sounded, Oboi and others immediately turned around and pulled out the three-type flints at their waists, attacked and loaded the bullets. With one go, they overturned the projectiles all over the sky towards the chasing Khalkha cavalry.

The Khalkha cavalry, who could not defend the situation, did not expect that the Ming army, who had only known for fleeing, would suddenly stop and fight back so quickly. Many Khalkha cavalry who rushed too fast fell to the ground.

But when Mutar reacted in time and brought the cavalry to encircle from both wings, Oboi and his third army had already taken advantage of this gap to run farther away.

"Cunning Mingdog!" Mutal couldn't help but be furious, waving his scimitar and rushed over, but who knew that the cannon suddenly sounded loudly at this time, and countless iron bullets were suddenly seen pouring in like heavy rain.

These high-collision iron bullets plowed several bloody roads like plows of the originally very orderly Khalkha cavalry, and countless people and horses were knocked into meat pies.

That's not all. When Mutar and his cavalry were finally catching up with the Third Army in artillery fire, a large cloud suddenly appeared on their heads. When they looked up, they found that it was not dark clouds, but huge cotton bags.

Mutal didn't know what kind of guy this was, so he directly ordered his cavalry to shoot a few arrows first.

The Khalkha cavalry had strong archery ability, and the height of the arrows they shot was no less than the height of shooting white phosphorus bullets with rifled rifles. However, Mutar and his cavalry were surprised to find that these cotton bags were too soft. When the bow and arrow shot, he was easily bounced out of a nest. The impact after the bow and arrow reached this height was severely reduced due to the air resistance, which caused the cotton bag not only to be pierced, but also naturally ascended.

And at this time, the soldiers on the hot air balloon would spill a large amount of water on the cotton bags. The cotton bags had increased gravity due to the wetness and quickly fell down. As soon as they approached the heads of the Mutar cavalry, the soldiers on the foot-pedal aircraft would decisively shoot the rocket up.

At this time, the airtightness of paraffin decreased due to the wet cotton cloth, and the gunpowder on the rocket instantly detonated the gas in the cotton cloth bag, and a large amount of methane gas quickly burned into a fireball and sprayed everywhere.

The heads of a large number of Khalkha cavalry were directly burned into charcoal, and even the horses were burned, making people and horses very painful.

The Khalkha cavalry were shocked. They never expected to be attacked from the head. Many of them were scared. Although there were still cavalry rushing towards the front positions of the Fourth Army, most of them were just inertia.

Mutal endured the scorching pain on his face (burned) and rushed towards the Fourth Army with the remaining more than 10,000 cavalry. In his opinion, since he could not handle the Ming cavalry that ran faster than the rabbit, he was not more than enough to deal with the infantry.

But soon he realized that he was wrong, because as soon as his cavalry rushed in, he heard the fierce wailing of horses, and many horses began to retreat consciously.

Mutar was surprised to find that the cavalry and horses on his side were covered in blood. Naturally, he didn't understand what was going on, so he could only whip the horse hard and let the horse attack quickly. However, the horses were not really without IQ. The things that pierced their horseshoes or feet just now made them dare not go rashly.

At this time, seeing that the formation of the cavalry of the Khalkha tribe had been in chaos, and even the horses were in a hurry due to the broken glass, Obai led two cavalry battalions of the Third Army and the Fourth Army to encircle from left and right.
Chapter completed!