After many battles of destroying gold and going west, the Mongolian cavalry obtained a large amount of property, weapons and armor through plunder, and captured the skilled craftsmen of various countries, making it possible to develop heavy cavalry, and made its own fully equipped heavy cavalry, and the proportion in the cavalry army also continued to increase, and a team of 10,000 people could reach about forty percent, becoming a main force of the Mongolian cavalry.

Therefore, Zhao Yu was not surprised that the Mongolian army dispatched heavy cavalry to charge the battle, and he was constantly seeking a way to break the enemy in order to defeat the Mongolian Yuan and restore the homeland of the Great Song Dynasty for many years. With the Song army fully replacing firearms and the fact that it was difficult to change the lack of horses for a while, he changed tactics around the existing equipment of muskets and artillery, and gradually formed a model with musket infantry as the output and cavalry as the cover.

In addition to muskets, in order to make up for the lack of firepower output, Zhao Yu also 'invented' a variety of artillery, formed a special artillery unit, and constantly optimized. In order to make the heavy cannon move better, he used the experience accumulated in actual combat and production to reduce the weight of the barrel and gun carriage by shortening the length of the barrel without reducing the power of the gun.

In addition, Zhao Yu changed the use of single-row horse traction to double-row towing, so that the use of six horses can tow a heavy artillery cart that can fire ten-pound shells, and four horses can pull a medium-sized artillery cart that fires six-pound shells, rocket launchers, or Franc rapid-fire guns, and the gunners are equipped with more convenient shoulder tools that are "cattle and horses", so that the equipped artillery has a strong mobility ability.

At the same time, Zhao Yu equipped the gun carriage with iron axles and sturdy, large-diameter wheels, which greatly increased its traffic capacity and allowed it to travel on rough terrain. He instructed the firearms workshop to create more precise spherical and accurately diameter shells, which ensured the range and accuracy of the cannon, and reduced the charge of the cannon, which in turn further reduced the weight of the barrel. In addition, Zhao Yu also replaced the previous situation of separating ammunition and cartridges with prefabricated cartridges, and increased the firing speed of French gunners with a layered ruler and gun body adjustment device, thereby further increasing the rate of shell firing.

"Your Majesty, Ni Dushuai, please order!" After Tan Fei saw the flag issued by the main general, he stepped forward and said.

"I have granted him expedient powers, and he can command them without asking for instructions!" Zhao Yu was still looking at the battlefield with a telescope and replied in a deep voice.

"Yes!" Tan Fei immediately ordered Guan Tong to reply, thought about it and asked his guards to send orders to strengthen vigilance, and transferred the personal guard group to arrange a defensive line in front of the watchtower.

"Nervous?" Seeing this, Zhao Yu put down the binoculars and turned back to ask Tan Feidao.

"Well, my subordinates are a little uneasy!" Tan Fei nodded and did not deny it.

"Hehe, it's the first time that our army has faced such a large-scale charging scene, and so is I!" Zhao Hao smiled, not hiding his nervousness at all.

In Qiongzhou, due to the limitations of combat methods, the Mongolian army used the sea as the main battlefield for several invasions, and the enemy cavalry that could land was limited, so there was a fundamental opportunity to launch a large-scale attack; In the Battle of Quanzhou, the enemy army was dominated by the Han army, and the cavalry was limited, and the largest was the charge of a thousand troops; In the battle to recover Jiangnan, the largest battle against cavalry was in the Huangling area, but the Song army occupied favorable terrain and built complete fortifications, and it was difficult for the enemy cavalry to launch a battle of such a scale.

Therefore, in the face of the battle of tens of thousands of cavalry charging into the formation, not only Zhao Yu is the first time to experience, but everyone is also the same. But he felt that everything had a first time, and all the units had gone through the drills to resist the impact of the enemy cavalry, and they relied on the military fortress to defend it, and the terrain was also unfavorable to the performance of the enemy cavalry, which still gave him the confidence to attack.

"Ni Dushuai, why didn't you give the order to open fire, the enemy cavalry is almost under your nose!" Wang Yinglin saw the overwhelming roar of the enemy cavalry and quickly approached, while our forward infantry retreated, and had already given way to the artillery, but did not open fire, and couldn't help but get impatient and patted the railing.

"Governor Wang, don't worry, only hitting the front team can't curb the momentum of the enemy's charge, as long as the rear team is scattered, you can thwart the enemy's attack!" Zhao Yu said.

Zhao Hao knew very well that the most common combat method used by the Mongol army during the offensive was to line up the troops in many roughly parallel columns under the cover of light cavalry, and advance in a wide line. When the first column encountered the enemy's main force, the column either stopped advancing or retreated slightly according to the situation, while the rest of the column continued to advance, occupying the enemy's flank and the area behind it. This often forced the enemy to retreat to protect its lines of communication, and the Mongols took the opportunity to approach the enemy and cause confusion as they retreated, and finally completely surrounded and annihilated the enemy.

When the Mongolian army rushed into battle, the standard battle formation was composed of five horizontal teams, each horizontal team was a single column, and the horizontal teams were separated by a wide distance, the first two horizontal teams were heavy cavalry, and the remaining three teams were light cavalry. In addition, in front of these five columns, there were also some light cavalry units responsible for reconnaissance and cover.

As the opposing forces drew closer, the three columns of light cavalry in the rear advanced through the gap between the first two columns of heavy cavalry, and after careful aiming, they hurled javelins and poisoned arrows of devastating power at the enemy. Then, while still in full formation, the first two columns of heavy cavalry retreated first, and then the light cavalry in turn. Even if the enemy's line is solid, it will be faltered by this prepared and dense barrage of arrows, which can sometimes be relied upon to break the enemy apart and eliminate the need for a surprise charge.

If the column commander believed that the preparatory attack had completely disintegrated the enemy, then ordered the light cavalry to retreat. But if necessary, the heavy cavalry was ordered to charge. However, if the troops in the center have already engaged the enemy, the flanks will be flanked and circled to the enemy's flanks and backs. In such outflanking campaigns, smoke screens, dust are often used to confuse the enemy, or the cover of hillsides and valleys is used. After completing the encirclement of the enemy, the various units launched attacks from all directions, causing chaos in the enemy's formation, and finally completely crushing the enemy.

Encirclement was a common method of warfare used by the Mongol army, and they were particularly adept at using stratagem to carry out this tactic. However, due to the change in the mode of operation, the Mongolian army cannot afford to lose Yangzhou, so strategically speaking, it is actually in a defensive position, and in addition to the limited terrain and the narrow combat area, they are unable to give full play to the advantage of strong mobility, and they can only retreat to concentrate their forces on the frontal battlefield and carry out a hard-hitting combat method.

"Fire!" Seeing that the enemy cavalry was getting closer and closer, it really began to change formation as before, and the light cavalry on both flanks began to slow down, and the enemy heavy cavalry behind them interspersed through the reserved gap, accelerating towards their own defense line. At this time, the enemy cavalry also entered the range of artillery, it was the best fighter, Zhao Hao couldn't help but wave his fist and roared, as if he was commanding from the front.

'Boom, boom, ......boom' Ni Liang, who was in command in front of him, was like having a heart with the little emperor, and almost at the same time gave the order to open artillery, and Liu Ming, the commander of the artillery brigade who received the order, waved the flag, and in the artillery positions arranged in echelons, the rocket regiment and the medium and heavy artillery regiments took the lead in firing, and the position was instantly shrouded in gunsmoke, and only the flames sprayed from the muzzles and the bright bullet marks of the rockets could be seen.

Then I saw that the rocket group was the first to explode in the rear of the enemy, raising clouds of smoke, and the surrounding enemy cavalry immediately fell into it, and less than half of the enemy cavalry could struggle out of it. Although the flowering bullets fired by the artillery were not as gorgeous and shocking as the rockets, they also exploded huge sparks after they landed, and the broken shrapnel mixed with the burst of earth and stones flew everywhere and shot out in a radial shape.

"......Huh" Zhao Yu breathed a sigh of relief, with the roar of his own cannon, the battle spirit of the Mengyuan cavalry began to be chaotic, and the war horse that was suddenly frightened by the sound of the cannon was a little out of control. After all, the Mongolian army is an elite soldier who has experienced a hundred battles, and although its combat effectiveness is not worse than in the past, the foundation is still there, and in the interval after the first round of artillery bombardment, the officers of each department quickly gathered their respective troops, adjusted their formation, and continued to rush towards their own side.

"Ah......" Seeing that the enemy was only bombarded by artillery fire, there was only a short period of confusion, and he didn't even get off his horse, so he readjusted his formation while running, and pounced again.

'Boom, boom, ......boom' When the enemy's cavalry was still 200 paces away from their own position, the rapid-fire artillery placed in front of the Chinese army began to wield. The rapid-fire gun contained fifty small projectiles in the shotgun charge, which scattered fifty paces out of the muzzle under the impetus of gunpowder, and the distribution fan reached dozens of paces, of course, the farther the distance, the larger the dispersion area. Although the distance is far at the moment, the power of the small projectile that can be fired is undiminished, and even the iron plate half an inch behind can be pierced, and although the equipment of the enemy's heavy cavalry is covered with chain mail and covered with layers of iron leaves, it is also instantly penetrated, which is in line with the saying that 'there is complete armor under firearms'.

The rapid-fire cannon had a very high rate of fire because of the use of a sub-barrel to charge, and before the enemy cavalry could rush into a hundred paces, it had already fired three rounds, blocking the enemy cavalry from a hundred paces away from the front line, and from a high place, the enemy line had already formed a huge recess in the middle, like a crescent moon. At this time, the rocket artillery and artillery completed the reloading, and after recalibrating the firing range, a new round of artillery fire coverage began. Even the enemy cavalry that was hit by artillery fire was already suffering heavy casualties and corpses everywhere at this time, but under the inertia of the attack, they still rushed towards the Song army's defense line......