The Mongol cavalry, with thick smoke and dust behind them, rushed towards the Thunderbolt army in three directions at the same time, and the simultaneous striking of thousands of horses' hooves made the earth tremble slightly. The Hudu cavalry, who was in charge of outflanking the two flanks, had confronted the field division in the Battle of Jiading, and they saw with their own eyes that Liu Da'er's 200 cavalry was annihilated by artillery in an instant, and knew that the infantry must not be allowed to set up artillery positions, because that would mean defeat. Four or five miles of land was only a matter of time for the cavalry, and the Mongols were excellent in horsemanship, so after a few breaths, the Mongol cavalry on both flanks was only two or three miles away from the Thunderbolt army. In the order issued by Kudu, these Mongol cavalry had only one task, which was to burn the artillery of the Perak army with oil and powder packets.

When the cavalry of the Kudu Department moved, Yelumaizhu also led 800 Mongolian and Han cavalry to launch a frontal charge. Liu Heima also made a bloody investment for this battle, and he was willing to send his own descendants to launch a frontal charge, which was the capital he relied on to become famous. At this time, although the Thunderbolt army was changing formations, it was too late to set up artillery, and it had not even lined up the chariot formation and installed the rejecting horses, but the infantry on the periphery had already erected heavy spears. These heavy spears are five meters long, and the shafts are much thicker than usual, and once people and horses collide with them, it is inevitable that they will become meat skewers. Even if they were able to break through these heavy spears and rush into the Thunderbolt formation, they would inevitably suffer heavy casualties.

Cao Ergou was high on the wooden lookout in the middle of the central army formation, observing the situation of the entire battlefield with a telescope. This lookout is imitated from the "General Essentials of the Martial Arts", the structure is simple and very convenient to use, only the parts need to be assembled with fir nails. When the scout cavalry reported that Liu Heima was leading a large army, Cao Ergou ordered to start moving into a defensive formation and let this simple lookout be assembled. This five-meter-high observation platform, combined with a telescope, can clearly see the battlefield situation. At this time, the three battalions of the Perak Cavalry Brigade were charging towards the Mongol cavalry on the front, left and right, respectively, to gain valuable time for the infantry to form a formation.

The Thunderbolts' infantry and the basic militia transporting the baggage were busy and unhurried, and time was of the essence in this race to win or lose. Thanks to strict military orders and training on weekdays, the Perak Army's position construction efficiency is very high. Some people are erecting triangular nails, others are fixing the carriages of light guns, others are digging to build heavy artillery positions, and others are digging earth and putting them in sacks to build a low wall. In a short time, the Thunderbolt formation was already taking shape—the innermost was the baggage, the middle was a defensive array of shields and spears, the outermost was a large van and a low wall, and the artillery positions were behind. It is said that putting soil into sacks and then filling in iron frames is faster and stronger than traditional wall building, the only disadvantage is that it costs iron, but it is not a big expense for the steel production capacity of the Perak Army.

The Thunderbolts' defensive formation was not completely closed, but left a lot of gaps. One is to leave a firing range for artillery, and the other is to leave a counterattack channel. However, these gaps were not large and could be easily sealed with shields and spears, and even if the Mongol cavalry broke through into them, they would die under the spears. In fact, it was not easy to rush through this formation, and even if the enemy broke through the artillery blockade and broke through, the Thunderbolts could still scatter triangular nails in the gaps, and they could also throw dense grenades to deal with the enemy. As for the use of spears and knives to engage in hand-to-hand combat with the enemy, it means that the battle situation is glued, and it means that even if the field division wins, it will be a crushing victory.

While the Thunderbolt infantry was in full swing, the three cavalry battalions were already entangled with the Mongol cavalry. The Mongol cavalry on the left and right flanks were 500 people, and the cavalry of the first battalion of the Perak Army that went to block the attack was also exactly 500 people. To say that the Mongol cavalry is far superior to the Thunderbolt cavalry in terms of horsemanship, combat experience, and tactics, the battle loss ratio of the reconnaissance cavalry teams of the two sides just now also confirms this. However, in this large-scale hedging, the two sides were evenly matched, although the Mongols still had a slight advantage in the scene, and the reason for this was due to firearms. Although the Mongolian cavalry was the best in the world in cavalry shooting, the bow and arrow needed to be held in the left hand and the right hand to pull the string, and only a few people could shoot arrows on horseback at high speed. On the other hand, the Thunderbolt cavalry was equipped with a short rifle with a short range, but it could be used with one hand and could fire six times in a row, despite its short range and poor accuracy. In the case of the scout and cavalry duel, due to the scarcity of the two sides and the long distance, the poor accuracy and short range of the revolver musket are greatly magnified, but when the team battle melee is densely populated, these are not disadvantages, and they can hit the target without aiming.

The advantage of the Mongol cavalry was in the bow and arrow, but also in mobility. They often used the traditional Parthian tactic, that is, using the mobility of horses to retreat to a distance and shoot with a bow and arrow, and then pull away after the enemy approached, which is also called kite flying. However, this tactic was ineffective against the Thunderbolt cavalry, whose purpose was only to prevent the Mongol cavalry from approaching their own infantry. Kudu's order was to rush into the formation and burn the artillery, but it was only necessary to break through the resistance of the Thunderbolt cavalry to achieve this goal. Therefore, the Mongol cavalry on both wings had no choice but to use melee weapons to fight the Thunderbolt army hand-to-hand. It's just that the Thunderbolt cavalry used a short rifle to tell them that although the cavalry is powerful, it is not invincible in the world.

Compared to the glue battle on both flanks, the situation of the Thunderbolt cavalry battalion that was blocking the frontal was much worse. On the one hand, this is because the Mongol cavalry that attacked the front had 800 men, while the Thunderbolt army had only 500 men, and on the other hand, because this cavalry was not equipped with bows and arrows like the Mongolian cavalry, supplemented by scimitars, axes, bone duo and other equipment, but was equipped with mounted spears. As the saying goes, "an inch is long and an inch is strong", the role of the cavalry spear in hand-to-hand combat is much stronger than that of a knife and a short axe. Therefore, after a round of hedging, the Thunderbolt cavalry suffered dozens of casualties. After a few rounds, the Thunderbolt cavalry battalion that was blocking the head-on suffered heavy casualties, although the casualties of the Mongol Han army were even greater.

The battle situation in front of him soothed the anxiety in Yelumaizhu's heart a lot, because he knew what it would mean once the Thunderbolt artillery was erected. In the past two years, the Mongolian army has suffered enough from firearms, and he was demoted because he led his army to suffer heavy casualties in the battle of Hengyuan Fort. In the eyes of Yelu Maizhu and other Mongolian generals, their repeated defeats to the Thunderbolt Army were not inferior in skill, but because of the firearms developed by Ouyang Xuan. Before the war, the Mongolian army discussed many strategies to crack firearms, and also listened to the advice of Kudu and others, and plugged the ears of the war horses with cloth to avoid being frightened, but they were at a loss on the fundamental issue, and the best way was to destroy the artillery before it was deployed.

As time passed, the tide of the battle gradually tilted in favor of the Mongol army. It's just that although the casualties of the Thunderbolt cavalry are getting worse and worse, they still don't retreat. In particular, the cavalry battalion of the Perak Army, which was attacking head-on, had suffered more than half of the casualties, but it was still fighting bloodily, completely blocking the way of the Mongolian and Han cavalry to charge. This situation in front of him made Liu Heima anxious again, and he immediately ordered to blow the horn of the general charge, and killed the Thunderbolt cavalry desperately with casualties, so as to break into the Thunderbolt infantry formation and kill all sides.