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It's all about paper, but it's shallow. Although the Cao family has also sent people to Yecheng sentinel many times, Guo Jia can almost draw a general structure map of the city based on this information, but for the troop allocation, the defensive weapons on the city, it is difficult to find out - even if it is detected, the other party will change it - if you want to come up with a strategy to capture Yecheng, you have to go outside the city to observe.

Theoretically, it is necessary to start one or two rounds of attacks to test the strength of the enemy army and its determination to resist before we can come up with a more stable plan.

Therefore, the Cao family strategists had no choice but to wait in Liyang for the time being, and at the same time spread out sentry to find out the surrounding situation. Fortunately, time is running out, that is, there is news to return, and Zhang Heshun won Neihuang. So Cao Cao gave an order, temporarily left Dong Zhao in Liyang, ensured the transportation of materials, and the army set off from the village to take Yecheng.

In the past few years, the scale of the Cao family class has become larger and larger, and there are more and more talents in Sikong Mansion, and under the leadership of Xun You and Guo Jia, the division of labor is clear. Now that the number of literary scholars under Cao Cao has also increased steadily, there is no longer a need for Xun Jiantian'er to follow him to help draft the decree - now this work has fallen on Yang Xiu and Yang Dezu. Cao Cao occasionally gave orders to let Shi Xun take charge of some trivial matters, but Shi Xun turned his head and pushed it to Dong Meng or Guo Huai.

Therefore, his main job in the past few days is to hold meetings with Xun You, Guo Jia, and Jia Xu to analyze intelligence, study and judge the situation, and draw up various offensive and defensive plans.

Wait until the army sets off from Liyang, two hundred miles smaller. It didn't take three days to kill under Yecheng. Yuan Shao really didn't go out of the city to fight head-on, just as the Cao family's strategists expected. Pulled the main force to the filthy city to the west. In addition, between the Dirty City and Yecheng, there is also a small city, Wucheng, and a team of soldiers and horses has also been arranged to communicate and echo.

According to less accurate information, the main force of Yuan's army stationed in the Dirty City was about 40,000; There were less than 5,000 people in Wucheng, led by the general Zhang Nan; Of the more than 20,000 people who stayed in Yecheng, the main general was to judge and judge Zhengnan.

Cao Cao summoned Shi Xun to ask: "Hongfu went to Yecheng, Yuan's generals." If you have more knowledge, can you know how to judge and match? ”

It was Xunxin who said that I really haven't had much contact with Xian Zhengnan, and just seeing that side in the water pavilion on the outskirts of Yecheng can't judge this person's ability and character at all. But fortunately, he traveled through the later generations, and although the records are not detailed, what did he do in the original history, but he can also make some reference. So the language is slightly organized. replied to Cao Cao and said:

"Trial, Wei people also, at the beginning of the aspiration to Han Fu, and then for Yuan Shao to rely on the heart. His humanity is rigid, his majesty is strict, and he is not on good terms with his colleagues. However, Yuan Shao was not moved by slander and alienated, so I expected that his heart was very strong, and he could not be moved by words. Moreover, the trial is arrogant and has no big plans, but there are small plans. The best way to guard the palace, Yuan Shao stayed in his Ye City. It can be described as a winning soul. The lord is cautious, and there is a trial in Ye, which is no less than the frustration in the past. ”

Cao Cao couldn't help but fall into deep thought. Although Cao's army has a great advantage in numbers, morale, and food and grass materials, it is impossible to divide the troops into the enemy-the other side occupies a geographical advantage everywhere, and if the troops are divided and the battle is fought, their own advantages will be completely wiped out--only part of the troops can only be divided to monitor and defend the two enemy armies, and first strive to defeat the third enemy army with the main force, and adopt the tactics of each breakdown.

So, in which direction should the main forces be delivered? The answer is very clear: if you attack Wucheng, you will be attacked from the east and west directions (Yecheng and Dirty City), which is the next policy; If the main attack on the polluted city, Yecheng will be able to send troops to attack the back of the Cao army, he has a strong city to rely on, and it is a big deal to shrink back, it is difficult to capture and destroy, and this is also a strategy; The only way to do this is to attack Yecheng with the main attack, and under Yecheng, the morale of Yuan's army will be weakened and it will be defeated.

But the problem is that Yecheng is broad and lofty, and Shi Xun said that he is good at defending the city, so the enemy of Yecheng is actually the most difficult to gnaw.

After weighing the pros and cons, Cao Cao ordered Xiahou Lian to surrender to Gao Lan, and led 5,000 elite soldiers to be stationed on the south bank of Zhangshui to monitor the movements of Wucheng and Dirty City. Wucheng has less than 5,000 soldiers and horses, more than self-preservation, and insufficient sorties; If the Yuan army of the polluted city came to reinforce Yecheng, not to mention that it had to cross the Zhangshui and sewage, the two places were more than 40 miles apart, and it would take more than an hour to arrive.

In fact, Cao Cao was hoping that Yuan Shao would attack from the Dirty City, so that he could defeat him under the city of Yecheng. What I am afraid of is that I will not be able to attack Yecheng for a long time, and after the morale is low, Yuan Shao will suddenly attack again, and the danger factor will be great.

Cao Cao pondered, I will stay under Yecheng City for three months at most, and there will be no progress after three months, so I have to retreat for the time being and wait for another opportunity.

The main force of Cao's army drove directly to the south of Yecheng, Xu from the city, and set up camp.

Yecheng was originally the county governance of Wei County, and after Yuan Shao became the master, it was expanded and increased many times, the scale was grand, and even passed the new capital Xudu, and approached the old capital Luoyang, and the Cao family strategists climbed the oars and overlooked, and they all couldn't help but gasp. Only Shi Xun was unmoved - this city wall is quite high, but is it comparable to the ancient city wall of Xi'an that he had seen in his previous life? The city is quite big, but is it comparable to the old Beijing city that I saw in my previous life? Especially in these years, the city walls were mostly earthen ramparts, and they were only reinforced with partially burned bricks near the city gates, so what was the grandeur and solidity to speak of?

It's just that...... The siege equipment of these years cannot be compared with later generations.

But after climbing the heights and looking, he couldn't help but have some doubts, and pointed to the small wooden houses on the city that protruded from the city walls every hundred steps, and asked Jia Xu beside him: "The last time Xun came before, I didn't see this thing, what is it?" ”

When he was brought to Yecheng by Xun Chen last time, he saw that there were buildings in the four corners of the city, but now he has built a lot of new temporary buildings, among which the huts and arrow oars that are convenient for the soldiers to rest, he knows what they are used for at a glance, but those wooden houses are haT again?

Jia Xu replied: "This building protrudes beyond the city wall, with holes on three sides, which can cross each other and lock the city wall. ”

Shi Xun listened to his explanation, and at the same time carefully observed for a long time, and then finally realized that he couldn't help but be surprised-this, this is the same principle as the fortress! Medieval bastions created many concaves in the walls, and with the exception of some dead ends, attacking at any point would expose the attacker to two firing points, and the defenders could deliver multiple blows with guò crossfire. Yes Xun remembered that in a certain time-traveling novel, the protagonist returned to ancient times and built a fortress on the borderline, but he didn't expect that the wise ancients who dared to love this ancient man would have it for a long time. This kind of wooden house is naturally not as good as the fortress itself in terms of solidity, but the defensive effect that may be achieved is the same, and it is built in case of alarm, and demolished if there is no police, and it does not need to be set up in advance when the city is built, and it saves countless materials than the official fortress!

If you think about it carefully, there are often urn cities outside the city gates, which are square or semicircular, protruding beyond the flat city walls, so that the two sides of the city gate can achieve the effect of crossfire on a certain distance. You really can't underestimate the wisdom of the ancients!

In the face of such a wall, it will be difficult for ants to attach themselves - what to do? Shihoon couldn't help but fall into deep thought. He recalled the history books he had read in his previous life, how did Cao Cao conquer Yecheng in the original history? Oh, first, Cao Cao dug a long trench outside the city, diverted water from the Zhanghe River to inject, cut off internal and external contacts, and then destroyed Yuan Shang's siege-breaking soldiers and horses, which greatly weakened the morale of the city. Finally, after the food was exhausted, the city was sacrificed......

Can this trick be used today? It doesn't seem like a good fit. Digging a trench is a big project, and it is easy to be obstructed and destroyed, so in the original history, Cao Cao dug shallowly first, and saw that the trial in the city sneered, and it was completely inappropriate, so that he could increase the number of people overnight and complete it quickly. But now Yuan Shao's army is forty miles away, and if he suddenly kills when he hears the news, Cao's army, which is busy digging trenches, may collapse in an instant. In the original history, Yuan Shang's department was not as good as today's Yuan Shao, and there was Yuan Tan behind him, so Cao Cao dared to bet on it, at least at this time, he couldn't gamble.

Shi Xun pursed his lips slightly, and said in his heart I will keep this plan for now, and then depending on the development of the battle situation, if the situation is in order, I will give it to Cao Cao, now...... It's better not to mention it.

When he came down from the tower, Cao Cao had already scattered his soldiers and horses and surrounded Yecheng. The west and north sides of Yecheng are on the verge of Zhangshui, and Cao's army built a pontoon bridge on the water and crossed the Zhangshui to set up part of the camp. The so-called encirclement, of course, cannot really spread all the people, hand in hand water is impassable, except for the main direction of attack, as long as it is possible to set up some barracks to prevent the enemy's contact and escape. Cao Cao naturally put the direction of the main attack on the south and east sides of the water, and the number of camps on the other side of Zhangshui was not much, which was also a sign of weakness to the enemy, hoping that Yuan Shao would be dizzy for a while, and would lead the army to surprise the army, so that he could wave the main force to cross the river through the pontoon bridge and go to a decisive battle with Yuan Shao's main force.

Zhangshui is an obstacle to his own attack, and it is also an obstacle to the trial of going out of the city, if there is a war in Zhangbei and Zhangxi, he wants to take advantage of the duel with Yuan Shao to suddenly go out of the city and attack, and the difficulty is also quite large. In a sense, this will be more effective than a decisive battle on the plains south of Yecheng.

Cao Cao had finished camping, so he first summoned Shi Xun and Liu Ye over and said, "Qing and others will prepare war equipment, and they will attack the city in three days." Liu Ye admonished: "When our army first arrived, the equipment was not finished, and it was too urgent to do it for three days?" Shi Xun smiled slightly, and said the opposite: "The trial must expect me to attack each other in three days, why not attack immediately without knowing the day, surprise, or victory?" ”

Cao Cao frowned and looked at Shi Xun: "You can attack the city tomorrow?" There is no joke in the army! ”