Luo Daniu put 100 imperial troops outside the east, west and north gates of Lan City, and all the remaining troops were put into attacking the south gate.

The way of siege is very simple, long-range suppression, pressing the defenders to the point that they can't raise their heads, and then the siege tower and cloud ladder ascend the city.

The cannon began firing when it advanced to a distance of one mile, while other siege engines and small artillery continued to advance.

When advancing to two hundred and fifty steps, the Guan Di army encountered a little trouble: there was a sudden sound of "bang bang" in the city, and then a burst of bricks flew out, about twenty in number, square, only the size of a fist, and fell into the formation of the Guan Di army with a roar.

The flight speed of these bricks was not fast, and the flight trajectory could be seen with the naked eye, but due to the suddenness of the incident, there were still four Guan Di soldiers who had no time to dodge and were hit.

Fortunately, the bricks bounced off the ground and didn't hurt the people behind.

Some of the remaining bricks fell on the open ground, and some hit the shield cart, making a loud noise, and the broken bricks flew everywhere, and a few lucky Guan Di soldiers were unfortunately splashed and injured.

However, the bricks did not cause much damage to the heavy shield carts at all.

Luo Daniu, who was pressing the formation behind, hurriedly shouted: "This is the catapult of the Ming army, pay attention to dodge, and hide in the shield cart when you hear the sound." ”

Not long after, there was a sudden sound in the city, followed by another burst of bricks flying out.

This time, as soon as the sound started, all the exposed Guan Emperor troops immediately hid in the shield car.

Most of the bricks missed, and a few smashed into the shield cart or the baffle at the front of the siege tower.

Just after the brick rain, Guan Dijun ran out again under the command of the officer and continued to pull the shield cart forward.

There are twenty catapults in the city, which were built temporarily in the past ten days, and in order to pursue the range, they did not hit heavy and heavy stones, but half a brick, which can hit a range of nearly 300 steps.

It's just that the power is a little worse, the accuracy is also poor, and it's easy to dodge.

Xue Dongting originally wanted to put these catapults on the city wall, but after seeing the opponent's distant and accurate artillery, he gave up this idea and placed them on a few streets behind the city wall instead, and raised the firing angle.

As a result, the catapult, which could hit 300 paces, became only able to hit 250 paces, and there had to be a cannon man at the head of the city to observe and direct the projection.

This is a helpless move, if it is placed at the head of the city, I am afraid that it will be bombarded into slag by the opponent's artillery.

Now, the catapult is safe, but Xue Dongting found that those bricks can't smash the opponent's shield car at all.

The opposing soldiers were all hiding behind shield wagons or siege towers, and there were no casualties at all.

The role of these catapults is only suppression.

Emperor Guan's army continued to advance slowly, and suddenly stopped when it was close to a distance of two hundred paces, only to see twenty marksmen carrying rifled guns on their backs, climbing up the five siege towers respectively, setting up their guns, and aiming at the officers, gunners, and artillery men on the city.

At the head of the city, Xue Dongting frowned suspiciously.

Why did you stop?

Do you want to hit the head of the city with a bird's gun?

Can you hit it from such a distance?

Just as he was puzzled, a burst of gunpowder smoke rose from the siege towers two hundred steps away, and when the gunshots came, Xue Dongting suddenly shook violently, and the whole person fell backwards, and a sharp pain and numbness suddenly came from his ribs, and the pain made him almost faint.

"Adult ......"

A few pro-soldiers next to him panicked and hurriedly ran over to help.

I saw that there was a hole in the ribs of Xue Dongting's body, and there was still blood in it, which was obviously hit by a gun.

Several of his own soldiers were even more panicked, and hurriedly helped him remove the armor and lift the cotton armor worn inside.

I saw a wound between his two ribs, and there was a gray lead bullet in it, the bullet had been flattened, but the tail was not round, but with a hole, and the shape was very strange.

Seeing the lead bullet, several pro-soldiers breathed a sigh of relief, and hurriedly lifted Xue Dongting up and ran down the city tower.

The lead bullet didn't hit his lungs, Lord Xue was just injured, as long as he dug it out in time, there shouldn't be any big problem.

The defenders on the city wall turned pale with fright, and the wave of bullets just now, apparently coming from two hundred paces away, knocked down twelve people at once, including gunners and a few officers who were commanding at the head of the city.

Those guns not only hit far, but they also hit the thieves accurately.

What's even more frightening is that it can break double armor.

Lord Xue has a pair of iron armor outside, and a pair of cotton armor inside, all of which have been pierced.

Those who don't have double armor will fall with one shot, and if you are lucky, you can still pick up a life, and if you are unlucky, you will be directly killed, and you will be killed.

"Fire, fire, don't let those siege towers come closer."

On the city wall, Shi Dekai lowered his body and shouted at a group of artillerymen.

The artillerymen ignited the ignition of the five Fran cannons.

In the rumbling cannonball, five shells roared away, some smashed straight into the formation of Emperor Guan's army, and some smashed on the shield cart or the baffle of the siege tower, banging and sawdust flying.

The barrels of these five guns were only three feet and five inches long, and the caliber was less than five feet, and they could barely hit a distance of 200 paces, but the power of the shells was limited, and they bombarded the shield carts and siege towers without destroying any of the shield carts.

At this time, gunfire rang out again on several siege towers, and most of the dozen or so gunners who were still firing their cannons just now fell.

Those who were not shot hurriedly lay on the ground, trembling, and did not dare to come out.

Shi Dekai kept his body low, so he escaped a catastrophe.

However, those gunners suffered heavy casualties, and the five Furlong cannons were basically scrapped.

The Guan Emperor army continued to advance against the shield carts, in the rain of bricks that fell from the sky from time to time, and the twenty rifled guns were also constantly harvesting the defenders' gunners.

When they reached a hundred paces, a few cannons rang out at the head of the city, which was nothing to the Guan Di army.

Not long after, Emperor Guan's army approached the city, erected the ladder above the moat, laid wooden planks on it, let the others rush through the moat, and erected the ladder.

Many of the defenders had already taken advantage of the chaos to escape, and the defenders who remained in the city were less than 500 people, basically all of whom were Xue Dongting and Shi Dekai's personal soldiers, as well as a few squire's guardians.

Intimidated by the power of the twenty rifled guns of the Guan Emperor Army, these people did not dare to show their heads, but only hid behind the incomplete female wall, blindly throwing stones out.

At the same time, the west gate of Lan Lan City was suddenly pushed open, and the suspension bridge was suddenly lowered slowly.

"Generals, we are willing to serve Lord Qin, saddle the horse for Lord Qin, and die."

At the head of the city, a group of defenders shouted at the hundred Guan Emperor troops outside the city.

The Guan Emperor army outside the city was excited, and hurriedly sent people to the south gate to report to Luo Daniu and Liu Youzhu, and sent two horsemen into the city to investigate, in case of fraud.

The two horsemen who entered the city looked around carefully for a moment, and then gestured out of the city.

The hundred-level outside the city immediately came with horses, roared into the city, and took over the defense of the west side of the city.

When Emperor Guan's army began to climb the southern city wall, Luo Daniu and Liu Youzhu received the news of the surrender of the north gate.

After a few words of discussion, Liu Youzhu led a thousand men and horses into the city from the west gate, occupied the east, west and north, and attacked the defenders of the south gate from behind.

Luo Daniu continued to attack the south gate, pinning down the defenders in the city and buying time for Liu Youzhu.

About half an hour later, Lanzhou fell.