North of the Great Wall, this piece is the territory of the Wuhuan people, the once powerful Han Dynasty has been about to collapse, just waiting for some people with ulterior motives to ignite the first fire, the northern Xiongnu, Qiang, Wuhuan and other ethnic groups are no longer in the eyes of this former giant.

Two years later, in the first year of Zhongping, taking advantage of the Yellow Turban Rebellion, the Eastern Han Dynasty court was unable to look westward, the Qiang Hu people Beigong Boyu and Huangzhong Yicongqiang leader Li Wenhou would unite with Bian Zhang to revolt, the momentum was huge, the Eastern Han Dynasty court sent Dong Zhuo and Huang Fusong to encircle and suppress, Huangfu Song took advantage of the suppression of the Yellow Turban Uprising, but was repeatedly defeated, and finally replaced Zhang Wen for recruitment.

Qiu Liju was even more in contact with Zhang Chun's rebellion before, and the difference with history is that there was no open rebellion, but it is not far away, Qiu Liju's ambitions have not changed, I am afraid that there may be an open rebellion at the earliest this year, at the latest next year, this has a lot to do with Yao Jie, once Qiu Liju rebels, he will definitely not let go of Youbeiping, and it is very likely that he and Gongsun Zan will go north to encircle and suppress at that time.

There is also a rising Xianbei, this is the real enemy, if the Han Dynasty in the Central Plains has decayed, when it is time to change the dynasty, the overlord of the grassland will also have a successor, since the Xiongnu Empire fell apart, no one on the grassland can help anyone.

Wuhuan, Qiang, Buyeo, Goguryeo and the Southern Xiongnu tribes of the Han Dynasty did not have the strength to become the overlord, and now the Xianbei people are rising, the sphere of influence of several other ethnic groups is constantly compressed, and it will not be long before the Xianbei people will pose a huge threat to the Han, it can be said that the strength of Xianbei is close to the original Xiongnu Empire, but the influence is not as great as the former, after all, the Xiongnu Empire's sphere of influence has been extended to the Western Regions.

Tuyin County, Yao Jie has carried out an expansion after his arrival, it is more than enough to accommodate 50,000 people at present, most of the people brought by Yao Jie are in Tuyin, and a small number of about 20,000 people are scattered to Xu Wu, Junmi, Wuzhong County, after the expansion of Tuyin County, Yao Jie has also heightened the city wall, the right Beiping is a vast and sparsely populated place, it is difficult to keep the enemy around to attack their hinterland, out of the Tuyin County outside the county office, the biggest change is Junmi County, Junmi County is different from the other three counties, located in the north of the Great Wall, is the most vulnerable to attack, so Yao Jie allocated more than 10,000 people to enter Junmi County to enrich the population, and at the same time heightened the city wall of Junmi County to three and a half zhang, one zhang in the Han Dynasty was 2.31 centimeters, and three and a half zhang is more than eight meters.

With the progress of this city construction technology, the city wall is getting higher and higher, for example, the capital city of Chang'an in the Tang Dynasty is only 6 meters high, and the Nanjing city wall in the Ming Dynasty is 12 meters high. Generally, the capital city is the highest, and other cities are shorter than the capital.

However, there are exceptions, that is, the border fortresses, such as the Yanmen Pass is 10 meters high, and the average height of the Great Wall is 7.8 meters.

Due to the different geographical environment in different regions, the height of the city is also different, such as the Xia Guotong of the Sixteen Kingdoms, the city wall is 10 thousand miles high, about 8 meters, which is higher than some city walls in the Central Plains at that time.

In ancient times, the construction of the city tower is a very huge project, there are great restrictions on the material and some technical aspects, and then the construction of the city wall has to be very wide, since the Han Dynasty when the city wall has been 12 meters wide, even a very wide carriage can walk on it, and in ancient times it was built by manpower, if the city wall is built too high, it may require huge manpower, so that the people will complain. Therefore, the real situation is not necessarily what is described in film and television dramas, after all, film and television dramas need effects, and the higher the city wall, the more majestic it will be.

And the eight-meter-high city wall with a longbow is enough to cause huge losses to the Wuhuan people, the Wuhuan people are nomads, mainly cavalry, siege has always been their weakness, the history of the nomads into the Central Plains are not cavalry, Wuhu chaos Huahu people are plundered a large number of Han craftsmen, created siege weapons, plus the main force of the Jin army in the Eight Kings Rebellion lost, the rest have almost no combat effectiveness, a touch of collapse, in order to capture the north.

Although the Mongols are known as invincible in cavalry, but they also rely on the infantry composed of the return cannon and other servant armies of various ethnic groups to break through the city, the Song army has been experienced in the opposing cavalry for hundreds of years, and it is difficult to win the Song army with cavalry to defend it, the bow and crossbow of the Song army shoot farther than the Mongolian army, and the crossbow can shoot through the armor of the heavy cavalry, so it is difficult for the Mangu to be effective against the Song army.

Later, the Tunguska people started with heavy infantry, the so-called cavalry and archery are just misleading descendants, most of their cavalry are Mongols, and the reason why the Tunguska people can enter the Central Plains is mainly due to the traitor Kong Youde gave them a large number of craftsmen, so that they have artillery and can break through the fortified cities of the Central Plains.

Now that the longbow was born in advance, Yao Jie has suppressed all the armies of this era in terms of range, and whether the bow range of the Wuhuan people is one-third of that of the longbow is a problem, and it is destined to be passively shot.

A month has passed in the blink of an eye, and Yao Jie has already equipped five thousand longbows, mainly because the purple shirts are not enough, in order to prevent there will be no materials in the future, so now Yao Jie is planting a large number of purple shirts.

The stock of stirrups, saddles, and horseshoes has exceeded 20,000 sets, but the iron is not enough, so Yao Jie's heavy infantry plan can only be pushed back, without the heavy infantry, although Yao Jie has no way to scare the Wuhuan people on the flat ground, although the other party can't play archery to play you, but the cavalry is not only cavalry, even light cavalry can pose a huge threat to ordinary infantry, and the Wuhuan people are anxious and rush up directly against your several waves of arrow rain, Yao Jie, who does not have heavy infantry, is afraid that he will be dumbfounded, just rely on his thousands of cavalry? Don't be funny, the Wuhuan people have at least 100,000 cavalry, and the riding skills are not comparable to the Yao Jie cavalry who are still training, and the equipment is also an advantage of three treasures on the Wuhuan people.

This autumn, Yao Jie may only be able to rely on defense to kill and injure a large number of Wuhuan people, as for taking the initiative, unless Yao Jie holds back heavy infantry or a large number of elite cavalry.