In fact, the border army of the Ming army with a little experience and some decent battalion leaders knew that it was very dangerous to fire with a single live ammunition, so in the early days, both the Ming and Qing dynasties often used shotguns, which is also one of the important reasons why shield vehicles were still popular in the East for a long time.

However, this time, Xiao Xuan easily understood from a strategic perspective: if the battle is won, not to mention the whole world, at least many resources in Gyeonggi and even the surrounding areas will be his own. And consuming a few or several guns, or even causing dozens of casualties due to the explosion of the bore, is an affordable price, not to mention that in the case of defensive operations, I have already thought of some ways to avoid casualties among the gunners in the bombing.

Therefore, when firing live ammunition, the gunners of the newly formed Guards Battalion fired their guns with a special ignition device that could be pulled by a kite rope and pressed against the gun hole by lever in the protection of the cliff hole in the trench. When aiming, of course, when the gun is reloaded, the muzzle of the gun is restored to about one degree angle, and the direction is close to the horizontal, and the enemy is aim.

The loud sound brought by the simultaneous firing of the 25 guns made the officers and men of the new battalion on the outlying positions of the Imperial Horse Prison, and even the four or five thousand auxiliary soldiers of the craftsman battalion who stayed behind, feel a huge shock and panic, as if it was not their own artillery attacking, but the enemy's "10,000 enemies" thrown into their own positions.

Xiao Xuan, who returned to the command position of the auxiliary battalion, did see that during the shelling, a thick smoke that seemed to be like an explosion did not erupt outward, but directly rose into the air on the gun position. Perhaps the gunpowder was too good by coincidence, or perhaps the artillery was too old and had participated in some battles in the past, and a large general's cannon exploded directly in the gun position.

According to legend, the bronze cannon should not be easy to explode, or not so easy to explode without warning. But this bronze cannon made by the Ming army obviously has too much tin, and it doesn't look like the last smoothbore cannon at all. The closer gunners, who had taken refuge in the cliff holes and had earplugs on, seemed to be dead when the officers who were overseeing the battle arrived, and only after a few slaps seemed to recover from the loud acoustic vibrations.

Almost at the same time, the effect of the twenty-five first rounds of artillery shells was enormous. Although the instability of the performance of gunpowder and the natural accuracy of live ammunition firing greatly reduced the results of aiming, and only about half of the 12 shells at the direct firing distance of about 100 paces were missed due to ricochet or too high a miss, but still 12 shells fired hit the encircled enemy position. Many of the officers and soldiers of the Fifth Military Battalion under Wei Yingjia believed that these shield carts that were selected to imitate Jiannu were safe. Even if the general cannon can destroy the shield car when firing live ammunition at close range, it will greatly reduce the probability of casualties in the back.

However, he didn't expect that when the overdraft risk charge made the speed of the seven-pound live ammunition be about two-thirds of the speed of sound, the heavy shield vehicles near the commander of the fourth battalion of the Chinese army covering the heavy shield vehicles did not resist the powerful projectiles, and some of the projectiles broke through and smashed into the crowd, causing more than ten people to be killed or injured; Some hit the left and right parts of the car, and the scattered sawdust caused at least a few minor injuries, while others passed under the car, crippling at least several people on the left and right of the crowd. The shells that passed through the front line still brought casualties among some of the projectiles and auxiliaries behind.

According to various estimates, there were still about 70 casualties caused by this round of shelling, but 19 of them were killed on the spot and the severity of the injuries was determined to be able to be killed in battle.

The defenders had just carried out two rounds of artillery bombardment, and the approaching enemy group had about 150 casualties, about half of whom were not ordinary cannon fodder soldiers. Although the casualty ratio is not too large, the reserves are still temporarily suppressed. This also made many generals of the Fifth Military Battalion, including Wei Yingjia, know that they must retreat at this time. No one thought that the team, which had just been in the army for less than half a month, would be able to fire such sharp artillery fire.

"Order the battalions to retreat in turn! Don't mess around! ”

"Violators will be killed!"

After the cavalry and horse corps deployed in the rear slashed and killed a few deserters, they finally contained a trace of confusion caused by the besieging army as it began to retreat, and seemed to temporarily stabilize its position.

When he found that the enemy troops besieging him were preparing to retreat, Xiao Xuan did not hesitate, and directly ordered to ask the artillery teams and demolition engineers in multiple directions with the pre-agreed flag signal. "According to the previous plan, is it ready for the second live fire?" , Although Xiao Xuan had already seen the flags around him swaying, he still asked as usual.

"Ready!" A teenager next to him replied.

In fact, Xiao Xuan was also hesitating to let the artillery team and the small artillery team go on before, and then cooperate with the spearmen to launch a counter-assault, but after thinking about it, he still had no confidence in these teams that had only been in the army for more than half a month. If you don't have confidence, try not to command according to the methods of elite soldiers. What if the blow is too big for the opponent during the day, and those people don't come to attack at night? Could it be that he led these people to start a fierce street battle in the capital? That's always a little dangerous.

Thinking of this, Xiao Xuan ordered: "The first front is ready to launch a blasting attack, so that the children on the front line can hide for a while... ”

"Detonate only the first front?" The young man who gave the order suddenly had some doubts.

"Of course, only the first front will be detonated," Xiao Xuan said affirmatively.

The blood-red flags were waved crosswise, making it not easy for these teenagers to learn the flag language in a short period of time. Xiao Xuan himself doesn't actually know the flag language, but it is not difficult for people to be familiar with what pattern and flag represent what kind of orders in the wartime plan.

Violent explosions rang out one after another from the front of the outer position of the Imperial Horse Prison. At this time, a series of white smoke also came out neatly from the outside of the temporary earthen wall, and it seemed that the unknown situation seemed to think that the gunpowder stored by the defending side had exploded greatly.

In reality, however, this is a "pit of no conscience" in the shape of an earthen inverted triangle similar to that in the militia textbooks of the 70s. According to the militia textbook, five kilograms of black powder in the seventies can be pasted and exploded to open ordinary brick walls, or when detonated in the inverted triangle pit, the "Heavenly Maiden Scattered Flower Thunder" that blows up about a ton of stones, of course, the Ming army gunpowder in this era is preferred to be of the highest grade, because there is no reliable quality saltpeter, and the production method is not completely correct according to modern standards, and the gap is huge. But even so, about ten catties of old-fashioned black powder also threw thousands of heavy lead bullets of about six or seven taels towards the enemy group. At least tens of thousands of six or seven heavy lead bullets were blown up in the direction of the enemy group by about 40 "pits without conscience."