Despite the limitations of the accuracy of the bed crossbow, the six giant arrows fired in the first wave did not cause any serious losses to the conquest army of the Later Zhou court. However, the distance between the two sides was only 300 paces, and the artillery positions on the Zhou army's side were lined up in a dense formation, so only one of the six world arrows missed the target and did not hit any target, and the other five were more or less captured.

Seeing the giant arrows the size of spears piercing the giant shield and the soldiers behind the shield together, or skewering several of his own soldiers together and nailing them to the ground, Liu Guangyi, who was directing the firearms bombardment with all his might, had to be distracted to pay attention to this sudden situation. Although with the loading speed of the bed crossbow, even if the branch is in the branch, it will not cause much damage to the artillery position before the enemy blows up the city of Lanzhou. However, it was considered that such harassment would inevitably make the soldiers in the formation, especially the artillerymen operating the artillery, uneasy, and thus affect the effect of the bombardment. Therefore, after a little hesitation, Liu Guangyi still ordered one-third of the thunderbolts and ballistas to turn around, expand the originally set bombardment range, and shoot at the city walls a hundred paces away on the left and right sides of the south gate of the city of Lanzhou, so as to drive away the Zhenning army there, especially the bed crossbowmen, and eliminate their interference with his own artillery.

With Liu Guangyi's order, the well-trained Houzhou "Shenji Army" artillery quickly adjusted the direction and angle of fire, and before the bed crossbowmen of the Zhenning army defending the city fired the second wave of giant arrows, they hit the gunpowder bag and flowering bullets to the left of the position of the bed crossbow. With the explosion of the gunpowder bag and flowering shells, the Zhenning army's bed crossbow battle position was suddenly filled with smoke and screams, and the soldiers responsible for operating the bed crossbow were blown down. Those bed crossbowmen who were lucky enough to escape the bombardment ignored the shouts and scoldings of the officials, fled from the battle position without looking back, and rushed to the city wall, and ran away in a few moments, and the only equipment of the Zhenning army that could pose a threat to the Later Zhou army was useless - in fact, even if the bed crossbowmen did not escape, they also had no power to return to heaven in the face of the bed crossbows that were blown to pieces or burned by gunpowder packs and flowering shells. Moreover, these thunderbolts and ballistas that turned around scattered not only the bed crossbowmen of the Zhenning army, but also the crossbowmen who were shooting the Zhou army's chariots in the area within the reach of the artillery fire, and they were also forced to retreat again and again by the artillery fire, and could not pose any real threat to the chariots that were moving slowly and without the slightest pause in the direction of their city gates.

In fact, from this time on, the outcome of the Battle of Lanzhou was already doomed. For this point, Liu Guangyi, Zhao Kuangyin and others in the city are well aware of this, and Zhang Huaisheng, who supervised the battle in the city, is also well aware of it. The difference is that Liu Guangyi and Zhao Kuangyin's hearts are full of confidence to win and a vision for the future. At this time, Zhang Huaisheng's heart was filled with endless self-blame and remorse. Zhang Huaisheng blamed himself for not admonishing his father to give up the idea of forming an alliance with the Beiping Army, blamed himself for believing that the Beiping Army would send troops according to the agreement like his father and other subordinates who supported the alliance with the Beiping Army, and blamed himself for pinning his hopes on his father's initiative after the Beiping Army broke the alliance, and did not accept the suggestion that his subordinates should follow the example of the Northern Han Dynasty Taiyuan to defend the war, neither dug a trench outside the city of Lanzhou that could add obstacles to the Zhou army's attack, nor did he use earthen bags to besiege the city to prevent the Zhou army from directly bombarding the city wall, not to mention building a strong fortress on the top of the city that could resist the artillery bombardment of the Zhou army, in order to counterattack the siege troops of the Zhou army, so that he fell into a situation where he could only be passively beaten now, but had no power to fight back. At the same time, Zhang Huaisheng also regretted that he was panicked and panicked when the Zhou army pressed the border, and prematurely sealed the four gates of Lanzhou City with earth and stones, so that even if he wanted to send the brave men out of the city to attack the enemy's artillery positions and chariots, it was impossible.

It's just that there is no regret medicine to take in this world. Up to now, Zhang Huaisheng had no other choice but to try his best to maintain the morale of the army, so that when the Zhou infantry attacked the city and the artillery bombardment was suspended, he had no other choice but to counterattack the other side. As for the way to surrender, it has long been left aside by the Zhang family father and son - rather than being imprisoned in the capital as a prisoner to be humiliated, it is better to fight to the death to the end to be heroic and happy.

Zhang Huaisheng planned to fight to the death, but the preparations for the bombing of the Zhou army after the city were under the city were nearing completion. After more than 200 chariots gradually approached the moat under the cover of artillery fire, the soldiers in the carts first filled in a section of nearly 30 paces of river on the moat at a very fast speed, and then drove directly under the south gate of Lanzhou City at the fastest speed. With more than 200 chariots connected end to end, between the south gate of Lanzhou City and the artillery position of the Later Zhou Army, two passages covered by thick wooden planks, raw cowhide and mud applied to the raw cowhide were formed. Along these two passages, a bag of gunpowder weighing about 30 catties was neatly filled in the city gate hole until the top.

Speaking of which, the Zhenning army in the city is not without a chance to fight back. With the deployment of the cart in place, in order to avoid the danger of accidental explosion of the gunpowder package being passed through the car, after the cart passed through the moat, Liu Guangyi ordered to stop the bombardment of the south gate of the city and the 100 paces to the left and right, and instead focused the attack on the 100 paces away from the city gate and the inside of the city gate. At this time, if the defenders of the city return to the south gate, they can attack the chariots below. In this way, it can not only hinder the opponent's action of filling the gunpowder in the city gate, but also force the opponent to send soldiers to the city to cover the chariots, so as to give the opponent a direct blow to the enemy and get rid of the previous unfavorable situation of being beaten and unable to fight back. It is a pity that the soldiers and even officials of the Zhenning army, who were originally responsible for guarding the south gate and the city wall on the left, had already been defeated by the artillery fire of the Zhou army and fled, and the defenders on both sides of the south gate and in the city were blocked by the artillery fire of the Zhou army, and it was difficult to get close to the south gate for a while. Therefore, no matter how anxious Zhang Huaisheng was at the head of the city, he could only watch as the Zhou army's chariots were deployed in place and began to fill gunpowder in the opening of the south city gate, but there was no way to stop it.

It took about an hour or so, and five hundred packets of nearly fifteen thousand catties of black powder were put into place one by one. After confirming that the daredevils responsible for loading gunpowder had evacuated to a safe position, with Liu Guangyi's order, a soldier of the "Shenji Army" lit the fuse in his hand. A moment later, an earth-shattering loud bang came from the doorway of the south gate of the city, and a huge column of yellow-black smoke also rose into the air. With this loud bang, the South City Gate, the south city wall where the South City Gate is located, and even the entire Shanzhou City shook. The artillery position of the Zhou army, which was only 300 paces away from the explosion point, was also not spared. Not only were the soldiers staggered and unsteady on their feet, but even the heavy ballistas and even the thunderbolts were bounced off the ground and deviated from their original positions by the violent shock.

The explosion was so violent that after the explosion, the soldiers of the Zhou army and the Zhenning army would be in a state of shock, ignorance, and distraction for a period of time, until Zhao Kuangyin, who was in the middle of the Zhou army, saw that the south city gate and the city wall dozens of steps to the left and right had completely collapsed after the smoke had dissipated, and the ruins formed a gentle slope for the infantry to charge, leading the troops to rush to the direction of the south city gate, and then brought their minds back to reality.

Liu Guangyi, who regained his senses and found that his brother had already led his troops to charge, dared to delay any longer. While ordering the giant shield soldiers, pikemen, sword and shield soldiers, and two battalions of musketeers to protect the "Shenji Army" artillery that had restarted bombarding the enemy on both sides of the explosion point, he personally led the other two musket battalions to rush out of the artillery position, rush in front of Zhao Kuangyin's main force of the Chinese army, rush to the south gate of the ruins, and guard both ends of the ruins, so as to ensure the safety of this passage for his main force to enter the city of Lanzhou.

At the end of the afternoon of the 22nd day of the second lunar month of the ninth year of Xiande, the city of Lanzhou was broken by the army of the Later Zhou Dynasty. Zhang Yongde, Zhang Huaisheng's father and son, and other members of the Zhang family and cronies all died in the battle, and none of them surrendered or survived.