Liu Jiajun already has quite strong strength and has the strength to challenge the current imperial court. Even if the city doesn't surrender, they can attack it. Even if the shell of walnut is strong, it can't resist people eating its meat.

But Liu Jun was very happy, because it meant that they saved time and reduced unnecessary casualties.

Of course, those who fight the most are those who give orders and subdue people without fighting.

We should know that Liu Jiajun can achieve such a great success in Jiangnan, that is, they beat the slow with speed and beat the mediocrity with elite. When the other party is in a mess, they attack and advance quickly. When the other party has no time to respond, they have appeared in front of the other party and defeated the other party.

They stay in Zhenjiang for one more day, which means that Nanjing has one more day to prepare. They will transfer more soldiers from other places, draw more family and strong men from the city, join the army and improve various guarding facilities.

If they can advance quickly and attack Nanjing when the other party's army is not formed and the defense is not completed, they will achieve greater victory.

Therefore, after the other party opened the gate, Liu Bu immediately ordered General Mao Shengli to accept the other party's surrender, and ordered several generals to lead their elite infantry and ride to Nanjing immediately.

Zhenjiang is stuck in their only way to Nanjing. If they take it here, they will have a complete wharf and army, and they can officially launch the siege. It is believed that if they take it here, hundreds of thousands of people will rush to Nanjing and besiege Nanjing.

Liu Bu knew the meaning of this place very well, so he didn't celebrate after he took it. He just sent some troops to disarm the other party and take over the urban defense. Then his troops quickly moved to Nanjing. At the same time, he also sent a large number of logistics soldiers and civilian men to improve the official ethics, Because he wanted to pull these cannons and all kinds of luggage in a steady stream.

Liu Jiajun's action was as fast as lightning. That was when they took Zhenjiang, they took over the four city defense. Their army immediately passed through the city and directly drove towards Nanjing. Naturally, it was their elite cavalry who took the lead.

Zhenjiang and Nanjing are only a few decades away. If the cavalry charge with all their strength, they can arrive in more than an hour.

Of course, they all know that the other party has long known that they began to land here and that they rebelled. Nanjing city has long been preparing defense and various equipment to stick to. It is not easy for them to win Nanjing city.

Nanjing has superior geographical conditions, with the Yangtze River in the north, abundant water resources and convenient transportation, and the Qinhuai River around the city in the south. It is a water transportation distribution center. Since ancient times, it has the reputation of "dragon flat and tiger crouching". Zhongshan has a dragon flat in the East, Shicheng tiger crouching in the west, and there is a large water surface of Xuanwu Lake in the north.

The main urban area is located at the intersection of Qinhuai River and Yangtze River. It is the hub of external transportation. It has dense residents and prosperous commerce. A large number of handicraft workshops serving the imperial court are also set here.

Because it is close to the Imperial City, the ministers' second houses are also concentrated in this area, such as Xu Da's house in Dagong square, Chang Yuchun's house in Changfu street, Zheng He's house in Mafu street, etc. the 16 large restaurants ordered by Emperor Taizu are distributed in the southwest of the old city where the commercial market gathers.

Huangcheng district is located in the east of the old city, with Fugui mountain as the branch of Zhongshan Mountain in the north and Qinhuai River in the south. It is not only convenient for water transportation, but also closely connected with the old city. It is ideal in all aspects. It is also in line with the model of Yangzhai back mountain, facing water and facing the sun pursued by Feng Shui. The only disadvantage is that the terrain is low-lying, but surrounded by mountains on all sides, which is a strategic hub for strategists.

From the inside to the outside, the city wall is composed of four walls: Palace City, Imperial City, capital city and Waiguo city. It does not follow the old system of taking square or rectangular as the ancient capital city. It has unique design ideas, exquisite construction technology and grand scale. Between the beautiful mountains and rivers of Nanjing, the capital city wall meanders for 36 miles, longer than the Beijing city wall, and is the largest city wall in the world, Waiguo city has a circumference of more than 60 Li and is known as the largest city in the world.

His construction thought has both inheritance and innovation, and has a great impact on the construction of Fengyang, the capital of the Ming Dynasty, and Beijing, and occupies an important position in the history of capital construction.

When Taizu Emperor Zhu Yuanzhang built Nanjing City, he regarded it as the capital of the country and launched millions of people's corvee in several surrounding provinces to build and work on it. It took 20 years to build such a large city.

After its completion, as the capital of the Ming Empire, it commands everywhere and dares not to obey. It is also a huge military fortress. Its defense measures and various equipment are very uniform. Even if it is surrounded by hundreds of thousands of enemy troops, it can resist the enemy's encirclement only by its strength of one city, which can be described as solid as gold, copper and iron walls, However, this huge military engineering system did not play its due role. In this huge city, it did not defeat and bring down the enemy when it was besieged several times.

For example, when Zhu Di fought here, the officers and soldiers guarding the city surrendered.

In the later Manchu and Qing Dynasties, they fought here and at the door. These officials did not want to use the most powerful defense system to resist the enemy, but took the initiative to surrender the city.

Therefore, the Taizu emperor spent endless efforts and manpower and material resources to build the giant city, which did not play the role he imagined. Especially after Zhu Di moved the capital, Nanjing's status was declining, and its prosperity was no better than that of the capital, but it was far worse in military terms.

Now the capital is in a mess. When they heard that Liu Jiajun took Yangzhou, they were in a mess.

According to the past habit, Nanjing city is only in charge of more than a dozen Southern Zhili governments. There is no way to take care of other provinces. Therefore, the imperial court will send Wu Zongda as the supervisor of Jiangnan to mobilize the resources of the whole Jiangnan. Nanjing has always been a nominal place, but now it doesn't even have this most basic name.

The problem is that their front feet have just completed the transfer of open rights, and the chaos in Yangzhou has occurred in their back feet.

They called Chen Wenruo's mobilization the Yangzhou rebellion. The disastrous consequence was not that Chen Wenruo captured Yangzhou and captured Wu Zongda and others alive, but that they attracted Liu Jun from Shandong and let Liu Jun advance westward along the river and sweep the whole Jiangnan.

Several big men in charge of guarding Nanjing city were completely stunned and frightened.

They understand one thing, that is, the soldiers are no longer trained because of the long period of peace in Jiangnan and the waste of military equipment. Coupled with the lack of food and sound, there is no way to resist the wolf like Liu Jun.

When Liu Jun's fleet moved westward and shelled all the cities, they were terrified. On the one hand, they immediately rushed 800 miles to report the emergency situation here to the imperial court. On the other hand, they ordered the officers and soldiers of Huguang province and other places nearby to quickly transfer back to defend Nanjing.

Because many people understand that Liu Jun came to Nanjing this time. As long as Nanjing, the whole situation in the south of the Yangtze River will collapse.

Even in the time of peace and prosperity, the imperial court supplied a large amount of money, grain and utensils needed by the north. Now, in the era of various disasters and wars, it is even more dependent. Who knows that they know that Liu Jun's retaliation has attracted him, which makes him very frightened.

The power of Nanjing city lies in the hands of the Nanjing Military Ministry, the Imperial Guard, Xu Guo Gong, and the eunuch eunuch. Several of them have been making plans since they heard of the change in Yangzhou, and then mobilized all the troops that could be mobilized to defend the thirteen gates and two water points in the city.

There is a saying that they have suffered from military training for a hundred years and have no useful soldiers in battle. This is what they say. The imperial court spends a lot on military affairs every year, which has become an extremely heavy burden. However, when they need to use troops for war, they find that there are not so many soldiers at all.

Nanjing is the broadest city in the world, with a vertical and horizontal range of 50 or 60 miles. It has 13 gates and two water gates. Even if 100000 troops are deployed, they may not have sufficient troops. Now their troops are only tens of thousands, and they are mainly old, weak, sick and disabled. So many troops are scattered in so many places that they can't defend at all.

Even though they have issued an urgent call order and ordered the soldiers from all over the country to quickly enter the guard and come to support here, they did not respond much. The nearby state capital heard that Liu Jun had come and great changes had taken place in Jiangnan. Many people did not dare to take action easily and mainly guarded their own territory.

What's worse, they managed to put together an army to support Zhenjiang and defend Zhenjiang. As a result, they met a small group of troops sent by Liu Jun and were defeated by the other party.

They had no choice but to close the city gate, forbid entry and exit, and then stick to it. They thought that Zhenjiang had sufficient troops and was as solid as gold. They could keep it for at least half a month. With half a month, they could calmly prepare and transfer more troops from all over the country. At that time, they would not be so flustered and stretched as they are now.

So they hurriedly gathered all the people they could, and studied day and night how to defend Nanjing and deal with the enemy.

Who knows, the frightening news came at this time, that is, Liu Jun began to cross the Yangtze River in an all-round way within hundreds of miles of the Yangtze River, forcibly cross the Yangtze River, attack Zhenjiang in the East and Anqing in the west, and prepared to besiege Nanjing. Zhenjiang fought extremely fiercely. The other party's documents for help flew to Nanjing like snowflakes ten times a day. The situation was extremely critical.