There are two city walls at the junction of the imperial city and the Han city, which are connected by a huge city gate, and between the two city walls is an artificial ditch five zhang wide, which is edged with bluestone, and the depth is not bottomless.

The city wall of the imperial city is as high as three zhang and two feet, along the inner side of the city wall of the imperial city is more than 20 tall enemy towers, which are built with stone rammed earth, and there are bed crossbow archers stationed at the top of each enemy tower, which controls a large area within a hundred steps of the north and south of the city wall.

The walls of Seoul were only two zhang high, and they were completely under the blows of the enemy towers and the defenders on the walls of the imperial city, so there was nothing to rely on at all.

Standing on a tall building, Su Jin led the crowd to look at everything in front of them, and everyone was silent and worried.

The north wall of Seoul is in vain, if the imperial city has enough troops, it can attack Seoul at any time, and if you want to defend it, you can't hold it, Yelu Chongyuan's army is coming, he doesn't have to think of any way at all, he only needs to drive into the imperial city, attack from here, and it can be unimpeded.

"Liao Dog is really fucking snobbish, Hancheng is a place where Han people live intensively, they must be afraid that the Han people will make trouble, so they came up with such a method, the situation in front of them, not to mention attacking the imperial city, is to rush into the city wall within a hundred steps is a problem, damn, this is tricky." Pan Jiang scolded.

Jingtai sighed and said: "Yes, in the afternoon, our patrol team was shot and killed more than 100 people in the north wall, and the city wall could not be approached within a hundred steps. ”

Su Jin looked at the situation in front of him, and couldn't help but be amazed by the careful design of the Liao people, the only city gate was actually an iron gate, and the artificial canal between the two walls was bottomless, obviously designed to prevent climbing and stealing or digging in, if this pattern gave himself 10,000 soldiers to defend this city wall, he was absolutely confident that he could block the attack of 100,000 troops, and he thought that when he entered Hancheng, the imperial city was at his fingertips, but he didn't expect to encounter such a tricky fortification.

"Everyone goes to rest, I am alone and quiet, it is not a good strategy to attack, we only have more than 80,000 soldiers left, and I am afraid that we will not be able to break through all of them." Su Jin said quietly.

Everyone had no choice but to leave one after another, and each went back to the camp to rest; Su Jin asked the guards to make a pot of tea, and sat alone at the window in deep thought; In the past few years, it has not been once or twice that he has encountered tricky and difficult things, and there has not been a time like today that makes Su Jin feel at a loss to start; Ordinary siege warfare, if the trick fails, there is a last trick to attack, but it is absolutely not possible here, the consequences of the attack are unimaginable, and the army cannot break through this strong fortification if it is all filled in, how much Su Jin wants to have a few cannons in his hand at this time, and he will bombard the enemy tower on the opposite wall, and everything will be solved, but this is just wishful thinking.

There were a few screams in the distance, and several Song soldiers who were getting closer were sniped by the bed crossbow on the enemy floor, and the angry Su Jin almost crushed the tea cup.

In terms of weapons and materials, the resources in Seoul are enough to support their own consumption, the only problem is that the Liao army occupies an absolute geographical advantage, and how to break this geographical advantage is the most important thing; All kinds of means seem to be useless, and all kinds of methods of attacking water and fire, digging tunnels and sneaking through are not applicable here, and it seems to have become a dead end in front of them.

Su Jin drank tea slowly, calming the anxiety in his heart, outside the window, thousands of Song soldiers turned out from the corner of the street, they held a wide door panel to block their bodies and slowly approached the north wall, Su Jin recognized that the short and thick figure in the leader was Ma Han, and couldn't help frowning, this fool knew that the north wall was dangerous and came with soldiers and horses, is this death?

Su Jin was about to order someone to give them an order to retreat, but he saw that the soldiers of the Song army erected the door panel to block their bodies, and hundreds of archers shot several rounds of arrows with fire into the imperial city, and fire suddenly appeared in the invisible places inside the imperial city wall, obviously rockets ignited the houses or supplies.

The bed crossbow on the enemy's upper floor began to bombard, and the door panel could not block the huge impact force at all, and dozens of people were killed and wounded at once, but the enemy's ordinary bows and arrows were all blocked by the door panel, and did not cause greater damage.

It seems that Ma Han is angry that the Liao army shot the Song army, which is to bring people to retaliate; Su Jin smiled bitterly, watching the fire and smoke rise from the wall, although it was extinguished after a while, suddenly his heart moved, and a strange thought came to his mind.

Su Jin quickly got off the tall building, and Ma Han walked with the soldiers scolding as he walked, and saw Su Jin hurriedly standing and saluting.

Su Jin said with a straight face: "What are you doing?" ”

Ma Han scratched his head and said: "I can't be angry, I took someone to release a round of rockets over the wall, and taught Liao Dog to taste it." ”

Su Jin said: "What's the use of a drop in the bucket? ”

Ma Han said: "At least get angry." ”

Su Jin said: "If you want to do it, you can do it, there are basically no important facilities and materials near the city wall, if you can burn the fire to the hearts of the Liao people, then it can be regarded as a skill." ”

Mahan's eyes widened and he said, "I would like to, but in such a big city, what arrow can shoot so far?" ”

Su Jin laughed, patted Ma Han on the shoulder and said, "Brother, although you did something stupid, you inadvertently reminded me that I have a clever plan, if I succeed, I am afraid that the Liao people will cry for their father and mother." ”

Ma Han said happily: "I know that there is nothing that can stump the son, how to get it, the son will say it quickly." ”

Su Jinyi waved his hand and said, "Follow me." ”

……

At night, the wide compound of the Privy Council of Seoul was brightly lit, and there was a strange thing in the open space in the middle of the courtyard, several cooked cowhides were sewn into a spherical bow, and a large basket was hung below.

"Pull up the corners and stand up." Su Jin shouted.

Several guards pulled up the four corners of the cowhide ball and stood on the high stool and lifted it, Su Jin poured a full pot of fire oil and lit it in the hollow under the cowhide ball, and after a while, the whole cowhide ball was inflated and bulged, and after a while, the incredible thing happened, the cowhide ball slowly rose up, and took the big basket below and left the ground.

Su Jin jumped into the basket, the cowhide ball shook a few times, but it still staggered up, leaving the ground with Su Jin who was standing in the basket and rising to a certain height.

The generals below were stunned and shouted in unison: "Pull the big handsome down, it's terrible to fall down." ”

Su Jin said in a loud voice: "Don't pull, I'll come down by myself." ”

After that, he reached out and took out an iron piece with a handle in the basket and slowly covered half of the mouth of the brazier, the cowhide ball really slowly fell down, and when it was almost to the ground, Su Jin completely covered the brazier with the iron sheet, the flame was extinguished, the bamboo basket fell to the ground, and the cowhide ball also hula down to cover Su Jin's whole person in it.

Everyone pulled Su Jin out, Su Jin's arm was burned with several big bubbles, but he didn't realize it, and laughed arrogantly: "It's done, it's just that the stability is not enough, and it still needs to be adjusted." ”

Jingtai said: "Dashuai, what kind of thing are you doing?" ”

Su Jin said with a smile: "This is called a hot air balloon, which can be lifted into the air, and the height can reach tens of zhang and hundreds of zhang." ”

Pan Jiang rolled his eyes and said: "The handsome man is really good at playing, the last general is worried to death, you still have the heart to play." ”

Su Jin said: "You know a fart, don't you think this thing is very beneficial to our siege?" ”

Pan Jiang said: "What's the use of this thing?" ”

Jingtai reacted and said loudly: "The marshal is going to rely on this thing to transport soldiers into the imperial city?" ”

"Huh?" The generals took a breath.

Su Jin said with a smile: "I guessed a little right, but it is not used to transport troops, where did the 80,000 army get so many hot air balloons?" Besides, the closer you get to the ground, won't you become a living target? ”

Jingtai said: "Then this is ......?" ”

Su Jin said: "Air raid on the imperial city, understand?" We still have 4,000 barrels of fire oil, enough to burn the imperial city thoroughly, only a dozen of these things, take a large barrel of fire oil and fly over the imperial city, specifically against the Liao people's palace and hall, as well as the military camp to throw fire oil to burn, if they don't burn it, do they cry dad and call mother? ”

The generals' eyes are flying in the air, I am a mother, this method can also be thought of, if this is done, the Liao people will have a good feeling.

"Don't stand and watch the show, everyone helped me pull all the cattle in the city overnight to slaughter, the cowhide should be intact, it must not be broken, and dozens of big bamboo baskets, I will think about how to improve the stability, go quickly." Su Jin waved his hand, buried his head between the cowhide ball and the big basket again, and concentrated on his thoughts.