Tang Yan frowned and said: "The general loves the people and admires the officials, but Chang'an City is high and deep, and if it is attacked, I am afraid that it will be difficult to capture within a few months, but it will only increase casualties."

Liu Ziqiu waved his hand firmly, and said loudly: "What is the duty of a soldier, a soldier is to sacrifice for the country and the nation, and to achieve the goal by sacrificing the lives of the people, this is not a soldier, it is a robber city, and the idea of attacking Liu has been decided, and there is no need to discuss it, Lord Tang, Liu has two things to support."

Tang Yan heard Liu Ziqiu's righteous words, and he was ashamed in his heart, and hurriedly said: "Please give the general orders"

Liu Ziqiu waved his hand and said, "First, you properly settle those concubines and palace maids in the palace, and second, appease the people in Jingzhao County."

In fact, Liu Ziqiu already had his own plan for attacking Chang'an City, but after all, his subordinates lacked the talent to govern the country, and for everyone who could be subdued, Liu Ziqiu would try his best to fight for it, and this conversation just now was just Liu Ziqiu's temptation of Tang Yan, through the test, Liu Ziqiu had determined that Tang Ziqiu was loyal to the Great Sui and the Yang family, and Liu Ziqiu would break with the Yang family one day in the future, so even if he gained Tang Yan's trust, Liu Ziqiu still couldn't entrust Tang Yan with important tasks

These two things are not complicated things for Tang Yan, sending Tang Yan to do it can not only play his role, but also keep him away from the battle of attacking Chang'an for a while, and in the future, it will be rewarded for meritorious deeds, Tang Yan did not play a big role in the battle of attacking Chang'an, and his future merits will naturally be less, and Liu Ziqiu does not need to arrange too high a position for him

……

Although Liu Ziqiu's army moved quickly, as he approached Chang'an step by step, the news inevitably reached Yang Xuangan's ears, and Yang Xuangan was shocked when he heard that Chang'an had been surrounded on three sides, and he really couldn't understand where this army came from, could it be that they came down from the sky

Although Yang Xuangan still has 200,000 troops under his command, not all of these 200,000 troops are stationed in Chang'an, and a considerable part of them are stationed in Fengyi County, Tongguan in Fengyi County, Pujin Pass and Longmen Pass are the three passes east of Chang'an, where Yang Xuangan and Li Yuan are the focus of contention, and they must not send heavy troops to guard and stay in Chang'an City, although there are still 120,000 troops, but most of these 120,000 horses are newly recruited soldiers, lack of training, low combat effectiveness, and rely on these people to defend the city, it may be okay to rely on these people to defend the city, if you want to let them out of the city, and fight these enemies from nowhere, it is tantamount to letting them go to death

However, according to the report of Tanmalai, there are not many soldiers and horses on every road outside the city, and if you concentrate your forces to destroy the enemy, you are likely to completely turn the tide of the battle all the way

Whether to stick to Chang'an or go out of the city to find the enemy for a decisive battle, Yang Xuangan couldn't make up his mind for a while, only in this hesitation, he lost the opportunity to go out of the city for a decisive battle, and Liu Ziqiu's army had completely surrounded Chang'an City

After besieging the city, Liu Ziqiu ordered someone to invite Yuwenkai over and asked, "Lord Yuwen really has a way to make the army enter the city without knowing it."

When he was in Xiping, Liu Ziqiu told Li Changshan that he still had to wait for one person, this person was Yuwenkai, the two capitals of the Great Sui, Chang'an and Luoyang, both under his auspices, the pattern of the entire Chang'an City was built under his auspices, and he was more familiar with the layout of Chang'an than anyone else, and after Liu Ziqiu made the decision to go east, Yuwenkai boasted that Haikou could allow the three armies to sneak into the city unknowingly

Yu Wenkai ordered someone to carry a big sand table, this sand table is to know that Liu Ziqiu is going to attack Chang'an City, after making it himself, this time he has to follow Liu Ziqiu to march with him during the day, and he is busy making sand tables at night, its hard work can be imagined, although it is hard, but Yu Wenkai has no regrets, because he really admires Liu Ziqiu

Not to mention anything else, Liu Ziqiu's method of making a sand table alone has benefited Yu Wenkai, not shallow, Yu Wenkai is best at two aspects, one is architecture, the other is the mechanical sand table, which can not only be used in the military, but also has a great use in architecture, which can make many of his ideas more intuitive, especially Liu Ziqiu's concept of equal proportions, so that Yu Wenkai's design of the building, whether it is a sand table or a pattern, is more accurate, with his great inspiration

On the other hand, according to the method smelted by Liu Ziqiu, the iron smelted has raised a new height in terms of hardness and toughness, so that the machinery designed by Yu Wenkai can run more smoothly, and many parts are smaller than in the past, but they can bear greater weight

At the beginning, he presided over the construction of Chang'an City, which is a merit that Yu Wenkai was proud of, although the Luoyang and Shanglin Sixteen Courtyards built in later generations are inseparable from his handwriting, but after all, Luoyang Outer Outline City was built very simply, almost an unfinished project, and it did not conform to his original intention, and Shanglin Sixteen Courtyard was just a place for Yang Guang to play, no matter how magnificent it was, outsiders could not see its true face at all, so the most proud of the project he built was Chang'an

Seeing that there will be a big war in Chang'an, the result of the war will often cause great damage to the city, and Liu Ziqiu also prepared a large number of trebuchets, these trebuchets were developed by Yu Wenkai and He Chou, he knows very well the power of these trebuchets, even if the strong Chang'an City is difficult to withstand the blow of the trebuchet day and night, Chang'an City is like Yu Wenkai's child, of course he does not want Chang'an City to be destroyed in the war, which is another reason why he took the initiative to contribute

Yu Wenkai pointed to the sand table and said, "Lord, please look here"

Liu Ziqiu stared at the sand table for a while, nodded and said, "This is Guangtong Canal."

Guangtong Canal is also a part of the Grand Canal, passing through the city from Chang'an City, and the grain from all over the country is transported to Chang'an through this canal, but Chang'an City has set up two sluice gates, and the sluice gate has already been blocked, and the passage from Guangtong Canal to Chang'an City has already been blocked, and it is very unrealistic to enter Chang'an City by waterway

"Yes, this is the Guangtong Canal," Yu Wenkai smiled and said, "My lord, please take a closer look, there is a red line marked by subordinates here."

Liu Ziqiu's spirit lifted and asked, "Could it be that you have set up a secret path in advance?"

Yu Wenkai hurriedly said: "How dare my subordinates set up a secret passage without permission, here is a drainage culvert set up by my subordinates?"

I heard that Yu Wenkai set up a drainage culvert, Liu Ziqiu's heart lit up, he was born in a special forces, so he naturally understood what the drainage culvert meant, and hurriedly asked: "How high is the drainage culvert, does anyone else in the city know?"

Yu Wenkai thought for a while and said: "The lowest part of the culvert is also more than five feet, which can completely accommodate a person to pass, but you need to bend over, and most of the craftsmen who built Chang'an City were later transferred to continue to build Luoyang City, and there should not be many people in the city who know about this drainage culvert."

Liu Ziqiu couldn't help but groan, this is an adventure, if Yang Xuangan also knows that this drainage culvert is preset at the exit, as long as an ambush is set at the exit, then how many people and horses he enters, how many people and horses will be destroyed, but from the heart, Liu Ziqiu also does not want to destroy the original walls and other buildings of Chang'an City through a strong attack, he paced back and forth in the camp tent a few times, and asked: "Where is the exit?"

Yu Wenkai had already understood this, and blurted out in his chest: "If the lord wants to enter Chang'an City through the drainage culvert, the entrance will be on the Guangtong Canal, and there are three exits in the city, one is the Longshou Canal in the east of the city, and the other two are in the south of the city, one is called Yong'an Canal, and the other is called Qingming Canal."

"Chengnan, quickly point it to a certain person to see where it is in the south of the city," Liu Ziqiu was overjoyed, according to the detailed secret report that infiltrated the city in the early stage, although Chang'an City is large, but the population is seriously insufficient, there are very few residents in the more than ten miles in the south of the city, very cold and desolate, if the exit is in the south of the city, it is just right to let the army sneak in through the drainage culvert and assemble there secretly

Yu Wenkai looked at the sand table for a while, pointed to two places very definitely, and said: "Once the drainage culvert is determined, it is difficult to change it, it is here."

Liu Ziqiu nodded, pointed to an exit on the Qingming Canal, and said: "This is the main direction of attack, and the other two places must not be given up, Zhang Liang, you lead the military horses to launch a feint attack at the north gate, pay attention to suppressing the defenders of the city with bows and arrows, Shi Danai, you select 10,000 elite soldiers to sneak into the city from the culvert, and then take advantage of the night to capture the south gate Guihai, please select 5,000 elite soldiers to sneak in from the exit of Yong'an Canal, the task is to block the reinforcements sent to the south gate in the city, Wen Hao"

Wen Hao had just arrived from Tianshui and immediately surrendered his hand when he heard the order: "The lord did not let the last general sneak in from the Longshou Canal?"

Liu Ziqiu waved his hand and said: "Your task is to lurk outside the south gate, and you must make sure to capture and defend the south gate."

Wen Hao hadn't fought a tough battle for a long time, and he had been gearing up for a long time, but it was Shi Danai's task to capture the south gate, and he was a little disappointed when he just served as the answer, and said: "The lord will be willing to sneak into the city and smash the palace city with his army."

Liu Ziqiu said with a smile: "Most of your subordinates are cavalry, and after Shi Danai captures the city gate, you will lead the army to break in, and use the mobility of the cavalry to quickly highlight the two military camps in the city while the defenders have not reacted, this is your main task, there is no problem."

Breaking into the enemy barracks, there will naturally be a fierce battle, Wen Hao became excited, and said loudly: "Please rest assured, the lord will not disgrace his life."

Liu Ziqiu waved his hand and said, "Okay, let's split up and prepare, just wait for the news in the city to come out and launch an attack."

Zhang Liang frowned and asked, "The lord doesn't know who led the group that infiltrated the Longshou Canal."