First, Lin Dan Khan was only the nominal Great Khan of Mongolia, and Lin Dan Khan only controlled some tribes in Mongolia, and some tribes did not obey Lin Dan Khan's orders, such as the Horqin Tribe.

Second, Lin Dan Khan's mistakes in internal affairs, he did not crumple the whole of Mongolia into a mess, but went to conquer those tribes who did not obey him, and as a result, Shengsheng pushed these tribes to the side of Jiannu, and those tribes in turn united with Jiannu to attack Lin Dan Khan.

Third, Lin Dan Khan's failure in diplomacy, did not handle the relationship with the Ming Dynasty in a timely manner, and did not receive substantial military assistance from the Ming Dynasty, in fact, this is also a huge mistake in the diplomacy of the Ming Dynasty, which undoubtedly gave Jiannu a chance to break through.

Chongzhen and Lin Dan Khan didn't think of the truth of the cold lips and teeth, and as a result, Lin Dan Khan and Chongzhen both died and the country was destroyed.

Fourth, Lin Dan Khan also has many fatal mistakes in command and operation, there is no doubt about this, **Hachi's sons are really good, almost everyone is a general, and I don't know if Hachi's old turtle has taken shit luck, Lin Dan Khan is really not the opponent of these little turtles.

After Yang Tingjian set off, he traveled for a long time, and suddenly a soldier shouted:

"Look, my lord, there is wolf smoke, three piles of wolf smoke on the side of the Great Wall."

Yang Tingjian hurriedly turned his head to take a look, and sure enough, he saw three black pillars of smoke rising into the sky on the Great Wall that was faintly visible in the distance.

This pile of wolf smoke means that the number of Tartars who have entered the Kou is less than 100, and two piles of wolf smoke indicate that there are more than 100 people and less than 1,000 people.

This is equivalent to an extremely urgent military situation, and other beacons have also lit wolf smoke one after another, and the wolf smoke carries relevant information, and will soon converge on military forces like Datong and Xuanfu, and the governors of Datong and Xuanfu will make corresponding arrangements, of course, their response is always closed, allowing the Tartars to plunder in the border area.

As long as the city is not lost, they have no guilt, and even military towns like Datong and Xuanfu dare not send troops to fight against the Tartars, let alone those guards.

Yang Tingjian hurriedly picked up the binoculars and took a closer look, this wolf smoke was indeed emitted by the beacon tower outside the Great Wall, and it should not be caused by a mistake.

Yang Tingjian shouted to the soldiers beside him:

Map ......

The soldiers hurriedly opened the briefcase and took out a map marked Shanxi from the bag, Yang Tingjian opened this satellite map of Shanxi on the war horse, and soon found his location:

"Huyukou...... This is Shanghuyukou,...... How can there be a ...... in Xiahuyukou?"

Yang Tingjian looked at the map in his hand, and suddenly his heart throbbed, this Huyukou is a good place to ambush!

Huyukou is divided into upper and lower Huyukou, in fact, it is a narrow passage, both sides of the passage are steep cliffs of more than 50 degrees, the widest part of the whole passage is about two miles, the narrowest out is also one mile wide, and the whole passage is five miles long.

This kind of terrain is indeed a good terrain for ambushes in modern times, but it is not very useful in ancient times, because even if the soldiers and horses are ambushed on the high mountains on both sides, they cannot attack the enemy in the middle of the passage.

But Yang Tingjian has a very good musket and artillery in his hands, and setting up an ambush in such a terrain will definitely have unexpected effects.

"The whole army was ordered to immediately halt its advance...... All turn to Huyukou, and be sure to ...... quickly It's the Mongolian cavalry, but we can't outrun the Mongolian Tartar light cavalry.

The sudden wolf smoke did not make Yang Tingjian immediately speed up his escape, but made Yang Tingjian have a burning passion for fighting. Besides, even if he immediately accelerated and fled, it would only bring down all the morale, but Yang Tingjian's four-wheeled carriage could run past the light cavalry of the Mongol Tatars, and as a result, he left his back to the Mongol Tatars, and Yang Tingjian would never do such a stupid thing.

The Jinyi Wei New Army has just seen a little blood, and it must not be destroyed because of this sudden incident, it must fight a winning battle, and thoroughly beat the spirit of the Jinyi Wei New Army, the Jinyi Wei New Army is the future of Yang Tingjian, and it is also Yang Tingjian's absolute power to save China.

Several pro-soldiers immediately rode their horses to convey Yang Tingjian's order, and a small flag with the word "order" written on them was planted behind them, and they shouted loudly as they ran:

"The whole army was ordered to immediately halt its advance...... All turned to Huyukou. ”

In an instant, the shouts of mutual orders were passed on to each other in the entire convoy, and the horses pulling the cart also snorted with a "poof", and the whole convoy began to turn. From the official road to Huyukou, the area is a flat river, because the weather is dry, so the entire road is basically passable by four-wheeled carriages.

The sound of "snapping" horsewhips continued to sound throughout the convoy, and the sound of "clicking" horses' hooves also sounded as quickly as a stormy wave, and the dust began to spread in the direction of the convoy.

From the official road to Huyukou, there are about seven or eight miles in, the speed of the whole convoy is not slow, and it takes more than 20 minutes to arrive at Huyukou.

However, when Yang Tingjian took the convoy to Huyukou to take a look, Yang Tingjian's heart suddenly cooled in half, only the remnants of the rock wall were left in the Huyukou gate, and the wall blocking Huyukou was only about two meters left, which seemed to have been removed by the Tartars who entered the Kou.

"Click...... My lord...... The three lowly officials came to receive the order. ”

After Lu Jianxing and Shen Lian arrived at Huyukou, they hurriedly reported to the Chinese army under the banner of the Chinese army, which is the combat rules of the Jinyi Wei New Army, and after they get the specific military orders, they will immediately return to the troops and do their best to complete the military orders they received.

Yang Tingjian turned over and jumped off the war horse, and directly spread the map on the ground, Shen Lian and the three of them also immediately dismounted, and started a brief military meeting on the spot, Yang Tingjian pointed to the mouth of the tiger valley and said:

"We're here at this moment-Xiahuyukou, you have to take a closer look at the terrain here, is it a good pocket, so I want to put the Mongolian Tartars in my pocket here.

But as you can see in the situation at Xiahuyukou, there is only a remnant wall of less than two meters, and it is very difficult to defend against the Mongol Tartars with full cavalry in such a position, because everyone is still facing a large-scale cavalry battle.

But at this time, we have no way to retreat, there is no escape, we can only die and live, so we can only fight these Mongolian Tatars here.

I conceive it this way, we will completely annihilate the Mongolian Tatars who have entered the Kou and the canyon between the upper and lower Huyu passes, and we must not let even one of the Tartars escape.

The specific arrangements are as follows:

Lu Jianxing and Shen Lian, with hoplites and musketeers, defended on this remnant city wall, and the artillery was placed behind the city wall, and at the same time blocked all the passes, of course, you can also take advantage of the time when the tartars did not arrive.