The advantages of the Shu army gradually expanded, and the scope of occupation became larger and larger, even if Cao Xiu forced ~ the Wei army to rush to this side like crazy, it was just to add some obstacles lying on the ground. The outer layer of vine armor soldiers slashed all the way through the armor of invulnerability and invulnerability, supplemented by thunderbolts, which greatly accelerated the speed of advancement.

And the fire that was caught in the inner layer by the rattan armor soldier ~ The gunners did not stop, they continued to load, shoot, and clear the chamber, and then loaded, shot, and cleared, and after loading, they put the gun on the head or shoulder of the rattan armor soldier in front of them to shoot, and after shooting, the gun was retracted back to clear the chamber and load, they were almost doing mechanical movements.

They mechanically do the actions that they have been trained thousands of times in normal times, and they basically don't need to aim when they are loaded with bullets, they only need to pull the trigger roughly in the direction of the enemy, and the Wei army is lined up in a dense human wall, and there is no need to aim at all, anyway, if the bullet misses this one, it can always hit the other one.

There is only one key to the fire ~ spearman, that is, fast, the faster the action, the more bullets shot in a unit of time, the greater the damage value output. In addition to moving quickly, one of the things they need to pay attention to is to silently count the number of guns they fire, and stop once they reach a critical point.

After a large number of tests, the troops have mastered the critical point of the barrel heating, generally speaking, the barrel of this number of bullets, its degree of heating will reach a critical value, if the fight continues, the barrel is likely to be bent, deformed, exploded and other dangers, so it is necessary to stop to replace the barrel or cool the barrel.

In addition, each fire~gun has a usage log, and each fire~gunner who uses it has to make a note of how many shots have been fired after each use. The reason why this was done was to count how many rounds of this fire ~ gun had fired in total. Today's fire~ guns are rifled, and rifling is the most vulnerable part to wear.

When the rifling reaches the wear limit, there is also a theoretical number of shots, when the total number of shots of this gun reaches this theoretical value, it must be tested by craftsmen, if the degree of wear is still within the acceptable range, the gun can continue to be used, but the craftsman needs to evaluate the remaining theoretical number of guns, and then be tested after reaching this theoretical number of fires.

When the level of wear is out of range, the barrel of the gun has to be replaced, and the replaced barrel is sent back to the firearms factory for recasting. In the final analysis, the smelting technology of this era was not very passable, and the life of the barrel was much lower than that of later generations, so this stupid method had to be adopted to control the number of single shots and the total number of shots of each gun.

Fire ~ After the gunner reaches the critical point in the number of barrel fires, he has to retreat and replace others to go up and continue shooting, so there is a passage vacated in the formation of the Shu army, this passage is called the traffic road, which is enough for two people to pass by, and this traffic road is constantly being moved, on the one hand, the people who retreat go back, and on the other hand, the people who supplement go to the front line.

In addition to the fire ~ spearmen, there are also rattan armor soldiers who go to the front line, because the rattan armor soldiers are not perpetual motion machines, they will be tired if they do too much slashing action, and they also need to rest, even if they don't need to rest, the knives in their hands will become dull if they cut too much, and they also need to be replaced.

However, the replacement of the vine armor soldiers cannot be as free as the fire ~ spearmen, and it is impossible to decide whether to retire or not. Because they are at the forefront, the slightest carelessness will cause the collapse of the whole line. The commander in charge of the front line would silently count the number of times the whole team swung and slashed, and calculated the fatigue level of the soldiers.

Officers usually participate in training with the soldiers and know the physical condition of the soldiers under their command well, of course, they do not wait for the soldiers to reach the limit of physical strength, and under normal circumstances, they will change the soldiers when the number of slashes has reached about half or a third of the maximum training capacity in peacetime.

This helps the soldiers to conserve their stamina, and if the soldiers are replaced when they reach their maximum training capacity, most soldiers will no longer be able to fight with their swords that day, but if they are replaced at half or a third of the maximum training capacity, they can continue to fight several such battles after resting.

However, the duration of each time needs to be reduced to maximize the soldier's physical strength. Another condition for substitution is that the replacement troops are ready, which generally does not need to be worried, the Shu army now has enough follow-up troops, and the reserve team will quickly arrive at the designated position along the traffic lane, under the command of the officer, the soldiers in the front row can be replaced at any time, and the replacement process is not even a second.

In addition to the movement of soldiers on the front line, there are also some auxiliary personnel who carry ammunition through it. The consumption of ammunition on the front line is very large, especially the thunderbolts, under the fierce impact of the Wei army, the soldier in charge of grenashing can quickly throw the thunderbolts that were originally hanging on his body, and at this time, the auxiliary personnel responsible for carrying the ammunition will come up in time to replenish their ammunition.

As more and more Shu troops entered the city, the camp of the Shu army became larger and larger, and then divided into several detachments and advanced in different directions. The Wei army could not resist at all, so they could only retreat again and again, even if the law enforcement team relied on slashing and killing the deserters, it was useless to prevent the soldiers from escaping, because the soldiers who were forced to fill in were quickly eliminated.

The obviously thick formation was quickly thinned layer by layer, and was even blown apart by thunderbolts. The soldiers who were blown up had nowhere to escape, because the terrain was narrow, the front was the Shu army, the back was the Wei army that was constantly driven up, and the buildings on both sides, and the only fate of the rout soldiers who were caught in the middle was to be killed by the fire ~ gunner or chopped to death by the rat armor soldiers.

Not long after leaving the city wall, it entered the residential area, and the advance of the Shu army was very fast, so the battlefield quickly entered the residential area from under the city wall. Originally, Cao Xiu was ready to fight a large-scale street battle with the Shu army, and he knew that if he faced it head-on, he would definitely not be able to defeat the Shu army, so he wanted to use the favorable terrain to drag the Shu army to death in the quagmire of street fighting.

However, the Shu army is different from their troops, they are always lined up in formations, when the terrain is large, they are lined up in large formations, and when the terrain is small, they are lined up in small formations. No matter what the formation, the periphery is always invulnerable and invulnerable. Poorly defended fire~ spearmen are always protected in the middle like minced meat.

This led to the ineffectiveness of all the Wei army's sneak attack methods. The Wei army originally had many pikemen in ambush in the rooms and shops on both sides of the road, and when the Shu army passed by, they would suddenly poke out their spears, and after a successful blow, they would immediately use the familiar terrain to hide or move. Originally, this kind of guerrilla warfare was very useful, but they stabbed it on the rattan armor just to tickle the vine armor soldiers.

On the contrary, it will immediately attract a counterattack from the Shu army. The counterattack of the Shu army was very simple and rude, that is, to throw a thunderbolt into it. They would not go in room to clear the Wei army in ambush, and find that there were enemies in that room, whether these enemies were soldiers, bandits or civilians, as long as they showed hostility, they threw a thunderbolt over and completely wiped them out.