In the ensuing time, there was basically nothing serious, but the plateau was not idle. Although Jiang Huanwu and Ling Feng hadn't come back yet, of course, it was impossible for them to come back in such a short time. But this does not mean that the plateau can only wait in Daigun, but can do some preparations. The first is to prepare supplies for the military operation of the assault on Yinshan. In addition to the most basic horse weapons, there were also vehicles, tents, food and grass, including cotton clothing for each soldier, and so on.

Of course, these things were handed over to Ning Qi, Shen Shen, Geng Zhong and others. Subsequently, Gao Yuan ordered the garrisons in various localities to concentrate on drills and step up military drills. In fact, after the end of the autumn harvest, most of the people in various places basically do not have much agricultural work, so it is also the time to organize the people to practice martial arts and practice military exercises. After all, in this era, war may be launched at any time, and the people's martial arts practice must also be grasped.

The people are like this, so the professional army must be strictly trained, because the attack on the Xiongnu's Yinshan camp will be carried out soon, and of course some targeted training will be carried out. Gao Yuan also specially organized two seven-day field marches for the army of Daijun, so that the soldiers could get used to this kind of long-distance marching and accumulate experience in long-distance marching operations. Fortunately, the area of Daijun is vast, and beyond the Great Wall, there is enough space for marching and training.

Time also passed quickly, more than twenty days passed in a blink of an eye, and at the end of October, and at this time, Ling Feng returned to Daijun with ten soldiers and reported to Gao Yuan about the passage of Yinshan and his party.

The Yinshan Mountain Range is an important mountain range in northern China, which runs east-west, high in the west and low in the east, starting from the Wolf Mountain in the middle of Bayannur League in Inner Mongolia in the west, and connecting with the Mongolian Plateau. Huashan in the northwest of Hebei Province in the east, across the central part of the Inner Mongolia Autonomous Region, is more than 1,200 kilometers long from east to west, 50 to 100 kilometers wide from north to south, is the northern natural boundary of the Yellow River Basin, but also the northern barrier of the Hetao area.

In ancient China, the Yinshan area was also an important place for communication between the Han people in the interior and the northern nomads, and the wide valleys between the mountains were mostly the thoroughfares between the north and the south. Because it is the central area of the Yinshan Mountain Range, that is, the Ordos area of the later generations, because the terrain is steep in the south and gentle in the north, and the northern slope is dominated by low mountains and hills, forming a lot of basins, collecting water into lakes, and abundant water and grass, it is also an important pastoral area for the northern nomads. This time the Xiongnu went south, and the camp was also set up here.

On this trip, Jiang Huanwu and Ling Feng brought fifty soldiers, three other guides, a total of one hundred and twenty-six horses, and changed into nomadic clothes, pretending to be grassland herdsmen, starting from Yanmen Pass, all the way to the north, passing through the eastern section of the Yinshan Mountain Range, going around to the north of Yinshan, and then turning westward, arriving at the middle of Yinshan, walking non-stop for nine days along the way, and drawing a detailed route map, marking the location of rivers and lakes along the way.

In fact, after crossing the Yin Mountain, you have completely entered the grassland, and some nomads can be found grazing along the road, and the closer you get to the middle of the Yin Mountain, the more nomads there are, and they are basically dominated by the Huns.

When they arrived here, they did not dare to be careless, so they bought some cattle and sheep from some nomads, disguised themselves as small tribes of grazing, mixed with the Huns, and found a place to settle down. Such small tribes are very common among the Huns, and many of them can speak Xiongnu, so as long as they are careful, they can get by. Then Jiang Huan Wucai ordered everyone to disperse and go to find out the news of the Xiongnu. After more than ten days of investigation, I also got a lot of useful information.

Although there were more than 100,000 people in the Xiongnu who went south to Yinshan this time, they did not gather together, but scattered into several parts, respectively, to find suitable places to station and graze, so the distribution is extremely wide, and the difference may reach hundreds of miles. However, this time, the camp of the Xiongnu's main general, Youxian Wang Tousu, was stationed on the shore of Wuliangsu Sea, with about 40,000 people.

Wuliangsuhai is located in the territory of the former banner of Bayannur Urat in Inner Mongolia, which was originally part of the Yellow River in ancient times. Later, the Yellow River was diverted to form Heji Lake, which was later the largest lake in the Yellow River basin and one of the eight major freshwater lakes in China.

Generally, nomads choose to settle close to rivers and lakes, because the survival of livestock requires a large source of drinking water, and the aquatic plants along rivers and lakes also grow luxuriantly, which is more suitable for pasture. And Wuliangsuhai is the largest lake in the Yellow River Basin, not only the water and grass by the lake are abundant, and there are many fish in the lake, but also a large number of birds and beasts inhabit, not only grazing, but also the best area for nomads to live and camp, so the head of the right sage king will also set up his main camp here.

Jiang Huanwu and Ling Feng also sneaked into the Wuliangsu Sea, checked the main camp of the Xiongnu, and drew a detailed map, and according to the observation of the two, the defense of the main camp of the Xiongnu was very lax, except for the Wang camp with some guards, and built a simple wooden fence wall, the tents of other Xiongnu residents were basically defenseless. First, the Xiongnu were nomadic people, and they had no fixed residence, so it was impossible to build strong camps everywhere they went. Second, it is also because the area in this area is now the territory of the Xiongnu, and other nomads have long been driven out of this area by the Xiongnu, so there is no other force that can threaten the Xiongnu. And the plateau of Daijun was not taken to heart by the Huns, it was more than 2,000 miles away from Daijun, how could the army of the plateau kill here?

Therefore, Jiang Huanwu also believed that as long as Daijun's army could suddenly reach the shore of Wuliangsu Sea, it would be able to break through the king's camp with a very light face. So Jiang Huanwu immediately decided to send Ling Feng to lead ten people back to Daijun to report to the plateau, while he still stayed in the Xiongnu camp, while continuing to collect intelligence while waiting for the arrival of the plateau's army. However, on the way back, Ling Feng and the others were paired with three horses and took turns to change trips, and it only took six days to rush back to Daijun.

After listening to Ling Feng's report, Gao Yuan was also very satisfied, Jiang Huanwu and Ling Feng really did not disappoint themselves, the information they collected was very important, and they could launch a military operation to raid Yinshan.

So Gao Yuan also immediately summoned Li Yinghong, Ning Qi, Shen Shen, Zhao Xuan and others to discuss the plan of attack.

The first is to determine the number of troops to be sent this time. The population of the Huns stationed in the Yinshan camp is about more than 100,000, of course, this number includes all men, women and children, according to the normal ratio, young and middle-aged men should be between 30,000 and 40,000, but the Karun Department has been wiped out, this Xiongnu army is all composed of young and middle-aged men, so now among the Huns in the Yinshan camp, the number of young and middle-aged men should only be more than 20,000, and it will never exceed 30,000.

However, the Xiongnu nation is the whole people, once there is a war, in addition to the old people and children who can not fight on horseback, men, women and children can go into battle to fight, so that the Huns in the Yinshan camp can send up to 70,000 to 80,000 troops. Although it is difficult to say how effective it is, it must not be underestimated just by looking at this number. Fortunately, now the Xiongnu are scattered and grazing, so the Wu'an army can also be broken one by one.

Everyone finally decided that the strength of the Wu'an army this time was 30,000, of which the cavalry should be about 20,000 and the infantry 10,000, of course, the infantry army was also on horseback. According to one soldier with two war horses for the journey, in addition, a war horse is required to carry food and supplies to ensure the speed of the whole army. And if you calculate it like this, if you send 30,000 troops, you need to send about 100,000 war horses. Therefore, the dispatch of 30,000 troops is almost the limit of the current force.

And this time, Gao Yuan did not intend to recruit soldiers from the common people, but drew troops from the garrisons in various places to form an expeditionary force for this sortie. The final troops dispatched were the Xiao Cavalry Army and the Shengjie Army of the Wu'an Legion; the flying cavalry army and the Changjie army of the Yanmen Legion; the Cavalry of the Legion in the Clouds; The mighty cavalry army of the Upper Valley Legion consisted of four cavalry armies and two infantry armies, with a total strength of about 31,000 people. And this time, the main players who led the team will be Gao Yuan, Li Yinghong, and Yuan Xuan. Because Shanggu and Yunzhong counties had to prepare for the attack of Yan and Qin, Sima Shang and Chen Shi were stationed in place. Although troops were drawn from Shanggu and Yunzhong counties, the people in all parts of the country are now training their troops, and in fact there are enough defensive troops in both places.

Judging from the time it took Ling Feng and the others to stay and return twice, Gao Yuan estimated that it would take about ten days for the army to set off from Daijun and arrive at the Yinshan Xiongnu camp. The time of the battle in Yinshan is estimated to take about ten days, plus the time of the return journey, and some unpredictable time, the maximum time of this sortie will not exceed forty days. Of course, there was also a plan for the march, how much distance it would have to cover each day, where water could be obtained, where camps would be stationed, and so on.

When the army set out, it carried fifteen days of food, and all of it was carried as mature food, so that at least one-way food supply could be guaranteed, as long as it arrived at the Xiongnu camp in Yinshan, it could get food supplies from the Xiongnu. In addition, because there are water sources along the road, you don't need to bring too much water, and only prepare drinking water for three days. It was the end of October, the weather was getting colder, and there was a possibility of heavy snow on the way, so each soldier had to bring a leather shirt and a fur cloak. to protect against the cold.

Originally, after the plan to attack the Xiongnu camp in Yinshan was put forward on the plateau, everyone thought it was incredible, but after all the plans and arrangements were formulated, everyone felt that the success rate of this assault was still very high, and it seemed that the plateau was not a whim. And Gao Yuan also immediately ordered the troops in various places, and the troops participating in the assault immediately set off to meet in Zhuwenze.