Zheng Guochang sighed in his heart when he saw that the emperor was in a hurry and Shoufu didn't agree, so he had to say to the class:

"Your Majesty quickly issued an order to the governor of Sichuan, Lord Fu Zonglong, and the general of Zhengxi, Mrs. Qin, ordering them to hold on to Sichuan without mistakes, and to prevent the Sichuan army from being surrounded and annihilated by the rogue and Qing troops alone.

If Sichuan is driven straight into Sichuan by the Liukou again, the great southwest will be in danger, and the consequences will be unimaginable. ”

This suggestion was targeted, and Chongzhen immediately ordered the cabinet to send the draft to the celebrant for approval.

Liu Zhilun was worried that the emperor would make another stupid move, so he said: "Your Majesty, Xianyang, Xi'an, Guyuan, Yan'an, and Hanzhong have been lost, and the Liukou in Shaanxi have now become the climate, and at this time, you must not send reinforcements there."

Now we can only take a defensive position to prevent the spread of the Liukou to Sichuan, Henan, and Shanxi, Lintao Mansion is too far away, and the imperial court whip is beyond the reach, so the only way to give up is to be lucky, if the army and civilians can be evacuated to Ningxia Town.

Zheng Chongjian, the governor of Ningxia, should still be able to organize 20,000 or 30,000 border troops, and it is difficult to take the initiative to attack, but it is still possible to defend the territory. ”

Chongzhen said with a crying voice: "I don't know that the reinforcements are all wiped out, and Shaanxi has nothing to do."

I am now worried about the safety of Tongguan, if Liukou and Dongnu break through Tongguan, how many men and horses can I gather to resist, and it is very possible to be beaten all the way to Jingshi. ”

Liu Zhilun said: "Your Majesty can rest assured that Tongguan not only has 10,000 Beijing battalions of Sun Dudu, but also at least one battalion of the 'Red Banner Army'.

It is impossible to be broken in the short term, and the minister is actually worried that the Yellow River will freeze after the autumn, and Liukou and Jiannu will not be able to seize Tongguan and directly kill Ben Henan or even North Zhili. ”

Chongzhen said: "I don't know if Aiqing has a plan now? ”

Liu Zhilun said: "Of course there is a strategy, I'm afraid that all the civil and military officials have thought of it, and the minister thinks that His Majesty actually has a decision in his heart." ”

Chongzhen was not mentally retarded, he understood that Liu Zhilun meant to ask for help from the general of the conquest, and asked, "Does it have to be like this?" ”

Liu Zhilun affirmed: "Only so! The situation is so deteriorating that only the 'Red Banner Army' can turn the tide. ”

"Yes! In the face of so many rogues and Qing troops, what other way can the imperial court be able to fight? Chongzhen, who was deeply saddened, once again chose to compromise and agreed to ask the general to send troops to solve the urgent need.

You have to show your own attitude when you ask people to do things! The emperor issued an edict to the cabinet, asking them to discuss the canonization of the Duke of Liao as the "King of Hanjiang County".

Three days later, it was the auspicious day of the zodiac, and the Ming court appointed Zheng Guochang and Liu Zhilun to Shanhaiguan to issue a decree.

In early February, 10 battalions of the first type plus the personal guard battalion entered the grassland, and more than 100 Mongolian tribes were conquered.

As soon as the earth thawed, the Chifeng Acropolis continued to grow taller in the hands of tens of thousands of soldiers and civilians.

Not only the construction of the Chifeng Acropolis, but also the restoration of a part of the hundred and thousand households, these small castles have to take on the task of cutting off the connection of this area.

The small castle must meet the garrison of a hundred households, which means that the garrison and the small family of seven or eight hundred people live in the fortress and do not seem crowded.

The medium castle is, of course, a thousand households, and the garrison here is controlled at about three hundred households, which must meet the needs of at least two thousand people.

All the small and medium-sized castles are arranged in two points and one line in the large cities Chifeng Acropolis and Ningyuan City, and the castles are separated by 20 miles.

Each castle has a tall watchtower, similar to a lighthouse, designed with a cannon muzzle, eye-catching and defensive function, and made of brick or concrete or stone and concrete.

The watchtower is guarded by guards around the clock, and the liaison officer on duty uses a 32-fold fixed telescope to overlook the flags on the two nearest castle lookout posts twenty miles away during the day, and can convey the message at night with the agreed light code.

After the deployment was completed, it was discovered that the enemy situation was relayed through the flags of each castle, and it only took one hour for Ningyuan City, six hundred miles away, to get the news.

The agreed flag is very simple, and when conveying military information, it is as concise and concise as sending a telegram, and it is generally kept within ten words.

For example, after receiving the information of the five characters of "Sandong and Ten Jiading", the Ning Yuan Zanhua Branch was able to understand that this was discovered by the outpost of the hundred households numbered Jiading, and there were more than 100 and less than 200 enemy cavalry ten miles east of the castle.

The number of enemy troops was agreed in advance, one represents the single digit number of enemy cavalry, two represents the number of ten digits of enemy cavalry, three represents that the enemy has more than 100 men and less than 200, and four represents that the enemy cavalry will not exceed 400 if 2 or 300 enemy cavalry does not exceed 400......

Each small castle was equipped with eight three-pounder furlong cannons, and there were more than a hundred defenders with self-generated guns and mini guns, and the Manchu and Mongolian cavalry launched a surprise attack to besiege such a fortress that could not be taken in a hurry.

The besieged castle can report the military situation at any time, and can get the instructions given by the superiors in time, and within six hours, the cavalry of the nearby "Red Banner Army" will complete the assembly and rush to encircle and destroy the invading enemy.

With a castle in twenty miles as a supply point, and thousands of cavalry patrolling the "Red Banner Army" non-stop, this line of defense will extend all the way to the Great Desert, which will be equivalent to dividing the Monan Prairie into two when completed.

After defeating Jiannu and conquering Mongolia, this line of defense could stretch north through the Gobi Desert desert and through later Mongolia to the shores of Lake Baikal.

Divide and conquer is simple and effective, once this defense line is built to the edge of the Gobi Desert, the Jiannu will not be able to make a detour through the steppe to plunder the Ming Dynasty, unless they concentrate men and horses to pull out these castles one by one.

Although the castles of the "Red Banner Army" are not large, they are all steel, masonry, and concrete structures, and all have at least eight anti-aircraft guns, which were absolutely indestructible in the Middle Ages.

Moreover, each fortress is not isolated, at least twenty miles apart there will be two adjacent castles, and under normal circumstances, among the three castles, there will be a medium fortress with a garrison of more than three hundred.

With the poor ability of the Manchurian and Mongolian cavalry, it is impossible for a hundred households to rely on such a fortress, and five thousand Manchu and Mongolian cavalry cannot capture it in a short time.

And as long as the Manchu and Mongolian cavalry approached this line of defense, their troop deployment would be clearly seen by the many lookout posts.

On that day, not only Ning Yuan would get accurate information, but even the Shanhaiguan Headquarters would be able to obtain the specific situation of the enemy's army.

Knowing that they were invincible in a hundred battles, the eyes of the Manchurian and Mongolian cavalry were blackened, and the "Red Banner Army" knew their situation well.

Under the precise attack of the "Red Banner Army", which was ahead of the equipment for an era, there were question marks over whether the Manchu and Mongolian cavalry who came to touch this defense line could escape back.

This is not self-talk, the Manchurian cavalry could not have imagined that the small castle suddenly besieged by them would keep in touch with the headquarters thousands of miles away at any time, and the net of encirclement and annihilation had been unfolded.

Even if they retreat voluntarily, they will not be easily escaped, and they will continue to encounter accurate strikes.