As soon as the belly of the fish turned white in the east, the Mongolian army in the camp was woken up by the noise from the direction of Guankou Village. Amidst shrill whistles and rude Mongolian yells, they yawned as they struggled to get out of the tents and huts with their eyes open. The new annexes rushed up the earthen walls of the barracks, while the Mongol cavalry ran towards the horses. At this moment, the Mongolian army in the camp did not pay much attention, after all, in the past few months since the construction of the barracks, the harassment from Guan Kou Village has not stopped, and the vigilance has gradually relaxed. Although the noise outside this time is a little louder, it is expected that it will only be a little more noisy.

In order to achieve the effect of a surprise attack. Cao Ergou gave the order for a silent march to the soldiers who attacked the Mongol barracks. In order to reduce the noise, the soles of the soldiers of the two infantry battalions were also wrapped with hemp fibers, and the four hooves of the artillery wheels and the four hooves of the mules and horses pulling the artillery were also wrapped in a layer of linen, and the mules and horses were naturally tied. Wrapped in sackcloth and marching in the dark, although the movement was slower than usual, but Guan Kou Village was only five miles away from the Mongolian army barracks, and it didn't take long to arrive in front of the trench of the barracks, which was still two miles away from the barracks wall. The Perak soldiers stopped here and began to set up their artillery.

At this moment, the sky had already brightened, and the commander of the Mongolian army saw that the black pressure outside was overwhelming a thunderbolt army, and his whole body was like falling into an ice cave, and he knew that something was wrong. Just now, before dawn, he judged from the sound that there were about 300 enemy troops attacking Guankou Village, and there were no cavalry. Although the Thunderbolt army has powerful artillery, the heavy artillery is heavy and difficult to move, while the light artillery has a short range and little power. During this time, he held the fortifications, relying on trenches, earthen walls, and trebuchets, and did not suffer any loss. In fact, when he was frightened by the noise before dawn, he had the idea of sending cavalry to drive him away. He thought it was just a larger harassment by the Thunderbolts.

The criss-crossing trenches surrounded the Mongol army camp for two miles. These trenches did limit the use of the Thunderbolt cavalry and light artillery. However, these trenches were also a double-edged sword, which also limited the speed at which the Mongol army could break out of the camp. The commander of the Mongolian army obviously could not watch the Thunderbolt army set up artillery, and urgently ordered his cavalry to go forward with the new annex army to raid, preparing to take advantage of the chaos of the Thunderbolt army's formation to burn the artillery with fire oil. His cavalry hundred-man squad still had more than seventy men after several consumptions, and it was originally used as a ranger to harass and drive away the Thunderbolt reconnaissance team.

The trenches surrounding the barracks were not completely enclosed, and the Mongol army reserved passages in front of and behind the barracks to facilitate travel. At this moment, the Mongolian army rushed straight to the artillery position two miles away from this passage, but before they could advance halfway, they were called back by the whistle. The commander of the Mongol army in the camp had already seen that sword and shield formations had been lined up on both sides of the artillery position, while several rows of spearmen were blocking the passage of the Mongol army's advance. The spears were five or six meters long, their long steel tips glistening in the early morning sun. If the Mongol cavalry insisted on attacking this hedgehog array, there would be only one consequence - to become a meat skewer. Seeing this, the commander of the Mongolian army was again in a burst of Mongolian words, and the more than 70 cavalrymen did not stop after returning to the camp, and rushed straight out of the back door and scattered.

As soon as the Thunderbolts set up their artillery, they launched an artillery bombardment. The two new field guns equipped with the field brigade are both front-loading firing methods, although the rate of fire is slow, but due to better sealing, the firing range is longer and more powerful. In fact, if it was cast in copper, the Perak Arsenal could also produce a rear-loading rapid-fire gun with equal power and range, which was later known as the Buddha machine. It's just that the Thunderbolt Army is too short of copper, and the existing copper is only used to make industrial machine tools and key tools, which is a bit nervous, and even the copper bullets used in muskets dare not be manufactured in large quantities. The officers and men of the field brigade have also repeatedly reported to the arsenal that the new type of field gun is heavy, and although it is equipped with wheels, the heavy gun still needs two healthy mules to pull, hoping to further reduce its weight. For this problem, the arsenal repeatedly optimized the design and casting process, but because of the poor ductility of the iron cannon, to ensure that the powerful gun barrel can not be too thin, so the total weight of the heavy gun is still 600 catties, and the light cannon has also reached 300 catties, which is much lighter than the fortress cannon of the same power.

Each infantry battalion of the field brigade consists of a light artillery company and a heavy artillery company, with 20 light field guns and 10 heavy field guns, and two battalions should have 40 light guns and 20 heavy field guns. It's just that due to insufficient production capacity, the current two battalions have only sixteen light guns and seven heavy guns. Among them, the range of light artillery is two and a half miles, and the range of heavy artillery is three and a half miles, and the firepower can cover all the Mongolian barracks. Due to the large area of the barracks, the Perak army did not test the artillery, but shelled the middle of the camp in one go—according to the Mongolian craftsmen, it was the Mongolian army's siege equipment warehouse, which was stored with fire oil.

With equal technical conditions, a large weight means more power, and also a longer range. These cannons are extremely powerful, not inferior to those old fortress cannons that cost thousands of pounds. It was only after a few rounds of shelling that Cao Ergou ordered the shelling to stop. On the one hand, the barrel has begun to get hot and needs time to cool down. In fact, these barrels produced under the strict quality system can still be fired, but the service life of the barrels will be shortened, and Cao Ergou feels sorry for these treasures. On the other hand, a fire had already burned out in the camp at this time. The oil was hit and flowed in all directions, igniting thatched huts, tents and horse yards. It was a dry winter day, and the fire became more and more intense, and it became a prairie fire for a while. The Mongol soldiers were scurrying around under the fire and began to flee to the back door of the barracks.

Just as the Mongolian troops were scattering and fleeing, the cavalry companies of the cavalry battalion of the field brigade and the reconnaissance battalion of the internal guard brigade were also dispatched. By the time the shelling began, they had already circled far behind the back door of the barracks. The Mongolian cavalry had already gone to move the rescuers, and only the new annex and the Mongolian commander and his personal guards were left in the barracks. Seeing that the situation was not good, the commander of the Mongolian army had already led his personal guards to slip away before the arrival of the Perak cavalry. The Thunderbolt Army's riding skills could not be compared to these natural knights, and they could only watch these Mongols disappear, so they had to turn their horses and intercept the new annexes fleeing in all directions. Seeing that there was no hope of escape, the soldiers of the new annex knelt down and asked to surrender. "Those who know affairs are handsome", not to mention that those who can run more than four legs on two legs at all, even the cavalry of the Thunderbolt Army has reached 400 people, which is more than the number of more than 300 new annexed troops.

The shelling just now did not kill or wound many people, as the objective was to destroy the siege weapons. These soldiers of the new annex army had already had a set of methods to deal with artillery because they had been harassed by the defenders of Guan Kou Village for a long time. As soon as the cannon was fired, they clung to the corners of the earthen walls or jumped into the trenches in the camp. Under the pursuit of the cavalry, all the soldiers of the new annex army were captured, and only a few were trampled to death and wounded by the Thunderbolt horses. Because most of the cavalry of the Thunderbolt Army is still not good at riding, they cannot move at high speed to stab or slash, and even a few people fell off their horses during the pursuit. The captured captives will naturally be the main force in difficult and dangerous positions such as construction and mining.

This time, the Mongolian army was completely annihilated in the camp with small casualties, but Cao Ergou was still not happy. One is because all the cavalry, including the commander of the Mongolian army, ran away, and on the other hand, the bookkeeper who defected from the Perak caravan died. Although he had not been in the caravan for a long time, he also knew a lot about the Perak army, and all of these things were told to the Mongol army as a greeting gift. He knew that the Thunderbolts hated traitors and traitors the most, and if they were caught, they would have to peel off their skins, so he simply committed suicide.