Of course, the situation like the walls on both sides leaning against each other will never happen. Fang Zhiwen is not so stupid yet. After all, he is a fortress camp. How could the walls be higher than the other party? If the distance is too close, no matter how you look at it, the other party will take advantage of it, and you can even launch a counterattack.

Fang Zhiwen's camp stopped three miles away from the city wall, and then Fang Zhiwen began to dig trenches to deal with the strong city. This kind of thing is the most effective.

At the beginning, Fang Zhiwen just dug around the camp, in order to prevent Sima Fang's cavalry from approaching the camp at will. Especially at night, these cavalry always ran around the camp and attacked them. It was very annoying. Fang Zhiwen, who always liked to use cavalry to harass the enemy, was finally attacked by the enemy.

After the trenches are dug, it is difficult for the enemy's cavalry to get closer, especially in the dark. You will not know where there are ambushing snipers in these crisscrossing trenches. After suffering a considerable loss, the enemy's cavalry finally dared not get closer. Fang Zhiwen could also calm down at night.

Then the trench began to extend towards the city wall. Fang Zhiwen built the trench very high level. The layout of the trench not only effectively defended against huge rocks, giant crossbows falling from the sky, and even oil tank fire attacks. As for ordinary crossbow arrows, it is difficult to attack targets hiding in the trench.

At the beginning, Sima Fang tried to use cavalry to destroy and prevent Fang Zhiwen's trenches from spreading, but soon he discovered that except for his continuous loss of cavalry, he could hardly achieve any effect.

Then Sima Fang dispatched heavy infantry to seize the trenches that Fang Zhiwen had already dug. He even planned to cross the trenches to attack Fang Zhiwen's camp.

However, Fang Zhiwen relied on the trench to resist for a little, and then withdrew all the soldiers back to the camp, allowing Sima Fang's infantry to occupy the trench and the surrounding ground positions. Fang Zhiwen used the height of the village wall to attack the enemy on the surface. In the face of advanced shooting command skills such as Huang Zhong, Fang Zhiwen and Wenpin, it would be extremely tragic to expose any established troops to the range.

As for the troops in the trench, they soon discovered a problem. Fang Zhiwen only used a few trenchers and kept attacking with tinder oil and fireballs to several fixed places, and successfully cut off Sima Fang's attempt to counterattack along the trench. Even if some of them rushed over without fear of death, there were snipers and enemy generals waiting for them behind them.

It was bloody during the day, and it was even worse at night. Fang Zhiwen's sniper was elusive and attacked any exposed enemy from the trench and the ground. Sima Fang was fierce and tried to attack once at night. It turned out that Fang Zhiwen's irregular camp was set up very strangely. His own troops could not be deployed at all. The troops could be deployed in the attack were quite limited, and the attack suffered extremely heavy losses. More than 10,000 corpses were left in front of Fang Zhiwen's camp in one attack, especially the number of grassroots generals who lost was even more amazing. The cautious Sima Fang no longer dared to try to defend and attack.

Fang Zhiwen unswervingly digging the trench, allowing Sima Fang and his son to do all their magic tricks. Fang Zhiwen has only one, digging the trench and killing people!

Sima Fang has carefully counted it. No matter what method he uses, as long as he attacks, the losses exceed 10 to 1. This result made Sima Fang and his son puzzled. How did Fang Zhiwen do it?

In fact, the reason is very simple. The key is Sima Fang's attack. The exchange ratio between the offense and the defense depends on the generals, soldiers and defensive facilities of both sides. Don't underestimate these simple trenches on the ground. These trenches are more useful than tall city walls. Fang Zhiwen is already a master-level trenches warfare expert on the Yingzhou battlefield. He naturally takes advantage of Sima Fang who has not undergone trenches warfare training.

The key here is the issue of damage ratio. Sima Fang's attack can indeed cause certain damage to Fang Zhiwen's troops. However, due to the existence of the trenches, Fang Zhiwen's initiative to freely replace the injured soldiers. Injury but not dead is useless in the game. However, Sima Fang does not have such convenience. In fact, Fang Zhiwen's troops have strong grassroots command power and rich experience. They have always chased the injured enemy to fight to the death. This is the secret of the high exchange ratio between the two sides.

Therefore, the situation on the battlefield became that Fang Zhiwen and his side were honestly digging ditches. Sima Fang was full of wits and tricks, but he took advantage of it and did nothing. Fang Zhiwen, who was unchanging and responded to changes, fought very well, but Sima Fang was defeated by the generals.

In desperation, Sima Fang also calmed down. He simply made up his mind. I think you can dig the trench into the city? You must know that Chang'an City has a moat. When the trench is close to the moat, Sima Fang plans to pour water into the trench directly. Let's see what else can Fang Zhiwen do?

However, Fang Zhiwen did not dig the trench so close, three hundred steps away from the city wall and two hundred steps away from the moat. Fang Zhiwen's trench still spread to both sides. In a blink of an eye, outside the wide East City of Chang'an City, all of them were traversing gullies at first glance.

Why three hundred steps? Because at this distance, the skills of Fang Zhiwen's grassroots generals can already shoot at the defenders on the city wall, and those with high ranks can even shoot behind the city wall, but they can only shoot blindly.

Next, Sima Fang knew what it means to be beaten and not fight back. Fang Zhiwen had a total of 52,000 soldiers, including nearly 2,000 grassroots generals. These two thousand generals were divided into two shifts and took turns to the front of the trench and threw skills at the target on the wall. Even if one skill could only kill one defender, Sima Fang would have to lose thousands in one day. How could this work?

This is undoubtedly a very stupid method, but this method effectively reduces the number of Sima Fang's troops day by day. The remaining 400,000 troops of Sima Fang are only a matter of one or two hundred days. Anyway, there is no time limit, so Fang Zhiwen is very calm and just tries slowly, so he doesn't have to worry.

On the contrary, Sima Fang and his son were very anxious, but it was useless to be anxious. Fang Zhiwen was stable and impeccable. This is the advantage of being upright. It is difficult for you to find loopholes, but if you fight so hard, the final exchange is more unacceptable than Sima Fang.

Except for throwing stones and crossbow arrows hopelessly every day, Sima Fang had very limited things to do. Sima Fang was anxious and organized a counterattack, temporarily snatched part of the trench, and then quickly dug through the moat, trying to flood Fang Zhiwen's trench.

But it was not until the water was poured in that Sima Fang discovered that these trenches could still change the passage at any time. The final result was that the moat water flowed along the trenches, passed through Fang Zhiwen's camp, and then merged into the irrigation canal in the east. It seemed that Fang Zhiwen had already prepared!

Sima Fang was ruthless and kept investing troops to compete with Fang Zhiwen for control of the trench. He would let the water fall apart after taking the next section. Fang Zhiwen seemed not in a hurry. Anyway, Sima Fang would have to pay the lives of the soldiers every time he robbed the trench, and what Fang Zhiwen needed was nothing more than time and physical strength.

Until the entire east side of the city had been flooded by the crisscrossing rivers, Fang Zhiwen moved the camp to the south side and repeated the same thing. The poor Sima Fang found that his cavalry had lost the space to move on the east side, and more than 100,000 infantrymen fell outside the east wall.

The same tactics were the only way to move the battlefield from the east side of Chang'an to the south side. Sima Fang was still facing the same situation, still helpless, and was still eroded by Fang Zhiwen bit by bit every day.

There is no seasonal or climate change in this copy, otherwise Sima Fang would be even more helpless when the river freezes in winter. However, even so, when Fang Zhiwen moved his position from the south of the city to the west of the city, Sima Fang had less than 200,000 troops in his hands. As the number of troops decreased, Sima Fang's combat losses increased, because Fang Zhiwen's strategy of prioritizing killing the opponent's grassroots generals in the battle played an increasingly important role.

Although Fang Zhiwen's entire tactics look stupid, they actually fight very carefully. If you analyze them carefully, you will find that Fang Zhiwen's troops use many subtleties to expand their advantages bit by bit, and then lock in the victory.

After 136 days of perseverance, the gate of Chang'an City finally fell. The battle that should have become fierce was still stable. Needless to say, Fang Zhiwen had no idea about defeating, Sima Fang had no idea of ​​defeating, and just fought the last battle step by step.

Four days after the city gate was captured, the palace fell and the long offensive and defensive battle in Chang'an was finally over.

....................................................

“Is it fun?”

The intelligent brain, who was holding Sima Fang's shell, seemed to mind Fang Zhiwen's slightly joking question at all, and nodded with a smile: "It's very interesting. Don't you think the collision of wisdom here is interesting?"

"The collision of wisdom is interesting, but isn't the collision of human nature more interesting? It might be more interesting if it was a real person fighting!"

"That... forget it, let them know too much, it's not fun. Moreover, will the real-person battles cause you any psychological burden? Killing is not an interesting thing after all!"

"I didn't say I'd replace all the soldiers with real people."

'Sima Fang' smiled and shook his hand: "It's almost done, I'm not watching the real person's story like this."

"Then isn't this task redundant?"

"Haha, don't test me. When you reach the top of the mountain, you will naturally know the answer. Then you will know if it is unnecessary. Come on, climb, boy! Haha..."

With the laughter, Sima Fang's expression gradually became colder. Fang Zhiwen shook his head helplessly, squinted his eyes and felt a little unconscious. He didn't know what he was thinking. After a long time, Fang Zhiwen slowly walked towards the stairs. (To be continued...)
Chapter completed!