After the preparations stopped, the Mongols attacked, to be precise, by the new annexed army. A large number of people, driven by the sabers and sticks of the new army, rushed to Yokohara Fort with dirt and wood on their backs—they were going to fill the moat. Only the south and east sides of Yokohara Fort have a moat, and the distance on each side is only a few hundred meters long, only a dozen meters wide, and less than ten meters deep. In fact, according to the design, the moat of Yokohara Fort should be wider and deeper, but due to the extremely tight construction period and the hard soil, it is more difficult to dig further down, so it did not reach the expected depth of 20 meters wide and 15 meters. Although it was the rainy season, there was no water in the moat. The main reason is that Yokohara Fort is located on a small mound, which is much higher than the surrounding terrain, and because the moat is not deep enough, the rainwater flows into the Wenjing River next to the fort. Therefore, this moat should actually be called a moat.

The soldiers of the new annex army stood half a mile away from Yokohara Fort, driving the people to fill the trenches in a steady stream. These people, in groups of several hundred, threw their things down the trench and ran, and then drove them back with the earth. At this time, the fortress wall did not open fire, but shouted: "Brothers, don't die for the Mongols, come to our side to have food, clothing, and ........" Cao Ergou really couldn't bear to kill these unarmed people. It was easy to escape, just slip down the bottom of the ditch to the south and run along the ditch to the mountain pass, which would allow you to escape from the clutches of the Mongols. It's just that the Perak soldiers shouted dryly, but only a dozen of them fled to the mountain pass. It's not that these people don't want to join the Perak army, but because they have many families, and if they escape, their families will definitely not escape the murder of the Mongols, and more importantly, they feel that they have no chance of winning in the Perak army, and they will be slaughtered by the Mongols in the past if they surrender. This is also the confidence of the new annexed army to hide in the rear and supervise the battle.

Cao Ergou saw that the shouting was not effective, and the people were still coming, and if they were allowed to fill in, the trench would not be filled in a long time, so he ordered an attack. It's just that he didn't give the order to use firearms, but ordered stones to be thrown down, and the few bows and arrows were also taken with iron arrows. The stones and headless arrows were not fatal, but they also caused the people to panic, and the cries of pain and pain intensified the fear, and they became cowering and stopped moving. When the new soldiers who supervised the war saw this, they beat the people with their swords and sticks, and the people cried wolf. To say that these traitor army was too ruthless to deal with their own compatriots, they wounded more people than the Thunderbolt army, and even killed a few people who walked slowly. Threatened by the bows and arrows of the warlords, these poor men had no choice but to tremble and continue to carry dirt and wood on their backs to fill the trenches. Cao Ergou was indignant at the evil deeds of supervising the new annexed army, and he immediately ordered to fire at these two ghosts. In order to avoid injuring the people, he used only a few light guns, and aimed them at the rear of the warlord's army. This shelling is not intended to have the greatest lethal effect, but only to deter these traitor troops.

As soon as the cannon sounded, the new annex army overseeing the battle fell into a small group, and most of the dead and wounded were pseudo-officers hiding in the rear, and the rest fled backwards. Seeing that the warlord team had fled, the people who were filling in the trench also dispersed in a hurry, some turned around and ran back, and more ran forward, they threw down their things and jumped down the trench and ran towards the mountain pass, and for a time more than 100 people ran. The sound of the cannon made these people suddenly wake up to the fact that if they did not escape, they would either die unjustly under the artillery, or die under the swords and arrows of the new army superintendent. "The lesser of two evils", there is still a chance of life in fleeing to the mountain pass, and as for the safety of his family, he really can't take care of it now, so he has to save his life first, and then make the next step.

Cao Ergou, who was standing on the wall of the fortress, felt a little proud in his heart. It is not difficult to repel the new annexed army, it is not difficult to shell the camp of the new annexed army and the Mongolian army, and it is not even too difficult to hit the overseer team half a mile away, as long as it is carefully aimed. However, in order to accurately hit the enemy without harming the people, it is necessary to have a precise grasp of the timing of the shelling. He easily thwarted the enemy's first round of attack and gained more than 100 people to defect, which made him feel very good.

After the new army overseers retreated, they stopped one after another when they saw that the Thunderbolts were no longer shelling. In their minds, artillery is a new weapon that is powerful, but the range is always a little shorter, and it is still not comparable to the two weapons of trebuchet and ballista. In fact, the firearms used by the Song and Mongolian armies were indeed primitive and weak in range, and were only used as secondary siege weapons. It was also for this reason that Ouyang Xuan had been telling Cao Ergou to use weapons cautiously and strive to achieve maximum results. In fact, among the dozens of fortress guns in Yokohara Fort, the light guns could hit more than one mile, and the six heavy guns of the largest caliber could hit more than three miles. If the amount of gunpowder was sufficient, the medium and heavy artillery of Yokohara Fort could reach the Mongol cavalry and the newly annexed camps. It's just that now the bombardment of the camp will expose the strength of Yokohara Fort and make the Mongols daunted. Easily letting the Mongols retreat and change tactics was obviously not Ouyang Xuan's purpose. His aim was to turn Yokohara Fort into a mill of flesh and blood for the Mongols, and to consume as much of the strength of the Mongol army as possible.

After a little formation, the new annex army escorted the people to the fortress, because they were afraid of shelling, and this time the new army stopped at a mile and did not advance, but forced the people to continue with bows and arrows. These traitors thought they should be safe a mile away. What they did not expect was that as soon as the men were out of range of their bows and arrows, they threw away their belongings and fled to the trenches under the shouts of the thunderbolts at the head of the wall. Seeing that the people were about to flee, the new annexes hurried after them. Although the Minfu was seen by them as a talking tool and could be beaten and scolded at will, without these cattle-like coolies, the Mongols would certainly have left them vacant.

It is said that the people ran very fast when they fled for their lives, and when they saw that hundreds of people were about to flee to the edge of the trench, the new annexed army behind them chased even more quickly, and they forgot the artillery on the city wall. Just as the people slipped down the trench, Cao Ergou ordered the rest of the artillery except for the heavy artillery to open fire together. There were more than a dozen small and medium guns on the south wall of the fortress, and the shotguns fired formed a dense network of fire, which in an instant caused a large number of new annexes to fall to the ground, and the rest were so frightened that they turned around and fled directly back to the camp. This round of shelling really hit the new annex army hard, leaving at least a quarter of the new annex army overseeing the battle dead and wounded, and there were more than 100 dead and wounded soldiers lying in front of Yokohara Fort alone. What's more, the defeat who fled back to the camp spread fear, which made the camp noisy. At this time, a group of cavalry rushed straight from the Mongol camp to the chaotic new annex camp. After a few moments, the commotion in the camp of the new annex became quiet, and several heads were raised high on the flagpole at the entrance of the camp. Then a large group of soldiers of the new annex army carried dozens of huge shields and escorted the people towards Yokohara Fort.