The use of the room is a very profound science and a move that was proposed early in the art of war.

"The Art of War: Yongjian Pian" has special annotations on it.

In thousands of years of history, the word spy has never been cut off. As for the Ming Dynasty, the most conspicuous ones were Xu Zengshou (Duke Ding) and Li Jinglong in the Jingnan Campaign.

Li Jinglong, who once led an army of 500,000 to fight against Zhu Di, became the number one hero of Jingnan after the war. He was specially promoted to the Guanglu Dafu and Zuozhu Kingdom, and was awarded the title of Prince Taishi, and added an annual salary of 1,000 stones. Every time the court discusses major events, Li Jinglong was at the head of the train. Isn’t that ridiculous?

However, time flies. By the end of the Ming Dynasty, the Ming Dynasty, which claimed to be a civilized man, was repeatedly defeated by the barbaric Qing Dynasty during the war.

When I was old slave, the Later Jin Dynasty was not good at siegeing the city. Whenever I took the big city, I would take the fine works first, first hide the fine works, attacking the inner and the inner fights, Fushun, Qinghe, Kaiyuan, Tieling, Chenyang, Liaoyang, and Guangning, all the battles. Their importance to fine works was far above our Ming Dynasty. It is reported that only one day after the slave soldiers conquered Chenyang, they sent meritorious spies to Liaoyang. Some gentry in Liaoyang had an relationship with Jiannu, and brought slave spies into the city in the name of family servants. In addition, spies who were originally in the city even knew that "slave spies are everywhere in Liaoyang", but the civil and military officials in the city ignored it. As a result, when Jiannu attacked the city, fine works detonated the Xiaoximen Gunpowder Deposit, and fired everywhere, and the city was in chaos, and the city was trapped.

This has to make people feel very emotional. The quality of the civil and military officials in the late Ming Dynasty is high or low, and have the scholars and officials in charge of military power really read the books into their hearts?

After Zheng Zhilong fought with the Qing Dynasty, the Zheng family had become a thorn in Dorgon's eyes. Not only Tianjin, Denglai and other places, but also Quanzhou in Fujian, I don't know how many people are lurking now.

Outside a small alley in Tianjin City, a middle-aged man selling chaos at the entrance of the alley was looking for change for the guests while whispering: "The peddler has walked by. If it is good, the news should have been spread."

The middle-aged man kept silent when he spoke, but the guest grabbed a handful of copper in his hand and whistled softly. The sound of footsteps sounded, and the people who hadn't known they had hidden there before came out, with a total of twenty or thirty people.

"Work!"

It was not the first time he had done the arrest. Every one of the twenty or thirty people behind him was experienced. A group of people quickly blocked an inconspicuous mansion in the alley. Then he broke into the door without hesitation!

The screams and the chaotic sounds were louder in just half a stick of incense, and the people in the house were captured in one fell swoop.

How difficult is it to completely eliminate the meticulous work of Tianjin?

However, Tianjin City has its own unique position. It is a military center, and internal and external information is not smooth. It is not clean to catch the inside, but what about the outside? As long as you pay attention to the channels that can contact the outside world, you can quickly and later pull out the pests.

When Zheng Hongkui received the news from Hei Bingtai, he smiled unconsciously. It would be better to concentrate the Tartars' attention on Yanjing, so it would be much easier for them to go to Shanhaiguan.

The latter is no longer Wu Sangui's nest.

After this Ming Dynasty Pingxibo surrendered to the Tartars, the Qing Dynasty gave him great favors. The entire Liaoxi Corridor fell into the control of the Guanning Army like the fiefdom. Shanhaiguan naturally fell into the hands of the Tartars.

Is this an exchange?

One hundred and twenty million Liao people from the army who were moved to Luanping by Wu Sangui, all returned to their hometowns.

It seems that everything is so beautiful.

Although it took a little longer, Mandahai finally managed to control Shanhaiguan in the middle of last year.

However, this western Liaoning Corridor is really not a Feng Shui treasure land. There is Juehua Island next to it. In order to deal with the threat from the Zheng army, Wu Sangui left nearly 20,000 troops here.

This is Dorgon who wants to borrow the Wu family to resist Zheng Zhilong's army, but why is Dorgon who is borrowing the Zheng family to suppress Wu Sangui?

Zheng Zhilong couldn't see Wu Sangui's dog head. But he felt it was necessary to go to the western Liaoning Corridor, and at the same time he could see if he could take down Shanhaiguan.

The latter's unique terrain and geography make it have all the conditions to become a solid fortress. It is close to the sea and has smooth logistics. As long as it can be taken down and remediated, it can become an indestructible fortress.

It can better cut the Tartars inside and outside the pass!

Zheng Zhilong has been aiming at this place for a long time, but he used to play chess pieces in Tianjin and Denglaibu, so he always had to be stable in these two places so that he could have spare energy to manage other places, right?

"Since that's the case, "Du (Zheng Zhipeng's name), I'll set off." Zheng Hongkui said, and went back without looking back. Only Zheng Zhipeng's eyes were full of envy behind him.

It is different if it is a brother of the compatriots. Zheng Hongkui first had the achievements of seizing Fujian, pacifying the people, supplying military supplies, and giving food, paying soldiers and arsenals. This could compare to Xiao He's contributions. Although Zheng Hongkui was facing many times better than Xiao He.

And now, when you lead the troops, there are 30,000 people, hundreds of warships, and hundreds of auxiliary ships, which are vast.

The first battle was to fight Shanhaiguan, and they were still raids, and even took advantage of the situation.

If such a war is still defeated, Zheng Hongkui is really inferior to a pig.

In the blink of an eye, a few days had passed. While receiving the information from Tianjin, the Qing Dynasty also received news that Zheng Zhilong gathered the canal ships in Jining. Although it felt absurd, Tulai, Turge and others still proposed to prevent Zheng Zhilong from heading north along the canal.

It was followed by news that Zheng Hongkui led the army of sea and land to kill to Tianjin.

Zheng Zhilong wanted to lead his army north, joining the men and horses brought by Zheng Hongkui and the original soldiers and horses of Tianjin, which should not be underestimated.

If Ajige's horse army remained in the Central Plains, and the soldiers outside the pass were still stationed outside the pass, and Zheng Zhilong led his army to attack Yanjing, then the soldiers and horses in Yanjing would be really difficult to resist.

But are we going to draw Ajige and the troops outside the pass now? Is that a bit of a joke?

When his own combat effectiveness of his troops did not have the advantage on the battlefield, the Qing Dynasty now also felt the discomfort of Zhu Ming at the beginning.

Whenever I fight against an enemy whose number is far less than that of my own, I must maintain an absolute advantage in the enemy's military strength so that I dare to go forward and fight. This is really a quick repayment of debt in June.

Now it is the Tartars' turn to worry about gains and losses.

"Our ancestral land is outside the pass. The imperial court moved south, and the land of thousands of miles was already empty. If the troops were drawn and the Zheng army came to harass him again, how could Prince Li resist it?"

"The fullness of ten miles outside the pass is less than the profit of one mile inside the pass. Where can I go, it is clear at a glance!"

"The Qing Dynasty has been in the pass for several years. Could it be that someone has returned to the outside of the pass to drink the wind and snow after salvaging it?"

After discussing and discussing in Yanjing City again and again, Dorgon could not come up with a definite way. Therefore, when Zheng Hongkui led the naval and army to the outside of Shanhai Pass, Ajige's army was still in Kaifeng, and the troops outside the pass were still outside the pass.

Dorgon and others were wrong, but instead made the most correct choice.

However, the cornerstone of the victory or defeat of the war is the real strength of both sides. In the three-point land of Shanhaiguan, the Qing Dynasty even brought green flag soldiers with the Eight Banners, and gathered only 5,000 people. Most of the artillery at the pass were towed away. How could they be the opponent of the 30,000 Zheng Army Land Division?

"Send someone to tell Shi Fu and let the plywood ship come forward. Smooth the cannons in Ninghai City for me."

Zheng Hongkui led the ship straight to Ninghai City, which is the old dragon head well known to future generations. It is a small town near the sea to the east of Shanhaiguan.

The vast Shanhaiguan is called Yiguan, but in fact there are as many as seven cities in front, back, left and right. From the Bohai Bay to the east to the Jiaoshan to the west, it is surrounded by mountains and seas, with the Great Wall as the main line, and the city is centered on the city, including many acropolis, passes, dozens of city platforms, enemy platforms, beacon towers, etc. It is a complete military defense building complex.

To the west of Ninghai City is the South Wing City, and to the west is the square Shanhaiguanguan City. The north and south of Guancheng have east and west Luocheng. You can completely regard the latter as the outer city of Shanhaiguanguan City. There is also Weiyuan City in the north of the city, a small fortress standing on Huanxi Ridge.

There are two sentry cities between Ninghai City and Nanyi City.

The so-called whistle city refers to the small independent fortress outside the city.

And further west of Shanhaiguan is the North Wing City and Jiaoshan Pass, and even the Yudao Pass and the Water Pass that goes westward, Zheng Hongkui doesn't care about it.

Because he didn't need to care about those people. He was not going to divide his troops to capture those places. He just took down the city and cleaned up all the Tartars and Tartars. Isn't everything complete?

And in the south of Ninghai City on the coast, on the flat open space, a dock that has been abandoned was once a point for the Liao army to transport grain and fodder.

Now Zheng Hongkui also took this eye on this and was preparing to use it as a dock for the army to land. As long as he swept away the several cannons at the top of Ninghai City, no matter how many troops the Tartars had hoarded in Ninghai City, it would be useless.

Bows, arrows, muskets cannot hit the port.

The three large plywood ships are obviously happy to show their skills here.

After hearing the same orders, the captains of the three warships all laughed loudly, and they loved to fight to the death.

Unfortunately, since the war with the Dutch, they have never encountered any real opponents. As for North Korea and Japan, they are just small fights.

As there were more and more large plywood ships in the Zheng army's sequence, their use of them was less and less. They either stopped at the port terminal or went to patrol and post in Nanyang.

This time, the fleet headed north as a deterrent - targeting Jinling, and it was rare to really use them. Now, it would be a pleasure to be able to fight.

"Brothers, everyone is moving, all moving. Let the other brothers see our majesty."

No one took the few artillery from Ninghai City in his eyes. The Qing Dynasty transported most of the artillery from Shanhaiguan, and the remaining artillery was concentrated in Ninghaiguan, and it could not withstand the number of artillery carried by any of them.

The three-meter-high Ninghai city was covered with soldiers and flags were waving. Especially at the fort, the third-class Melezhangjing Zhuobutai was in charge and erected the flag high at the top of the city.

As Oboi's younger brother, Zhuobutai is proud of his elder brother.

During his lifetime, Obai was a famous warrior in the Qing Dynasty.

Zhuobutai knew that he would never be as good as his brother Oboi by force, but he had a heart that was no worse than Oboi.

The sunlight completely dispels the morning mist, and the waves on the sea surface are shining, and seagulls pass by from the low altitude. In the distance, you can see the white sails that are undulating with the wind and waves, with shadows and shadows.
Chapter completed!