On the morning of March 12, after the troops had a full meal and were ready to go, after Lü Bu made a brief mobilization, Li Su led 2,000 cavalry to set off first.

Following Li Su's actions were a team of scouts in charge of this area, who were sent by Lu Bu to Li Su as guides.

Linhe City along the south bank of the Yellow River to the west is not far from the territory of Heyin County, only more than 150 miles away from Heyin County, it was originally the territory controlled by the Xiongnu Right Xianwang Department, after the rise of Lu Bu's power, the Huns retreated to the west for 50 miles, as a buffer zone between the two sides, although the Huns retreated, but there are still a lot of scouts, closely monitor the Lu Bu forces, if there is a wind and grass, they are ready early.

This time, the young and strong people of each euple were withdrawn, and King Youxian asked each eupon to retreat westward and concentrate their forces around Heyin Castle to facilitate defense and rapid transfer.

For this kind of order, the tribes did not hesitate to carry it out immediately, and no one would gamble with their own lives, besides, the nomads had to wander around, chasing more fertile water and grass to live, and they had long been accustomed to migration, without any dissatisfaction or resistance.

Li Su divided the scout tun into two parts, the first part was a team, which continued to be led by the tun commander, and closely monitored the surroundings of the cavalry unit to ensure that the normal march of the troops was not disturbed; The other team, led by those old scouts, went out within a hundred miles of the troops, spying on the news of the Xiongnu settlements, and was responsible for killing the Huns' scouts, trying to ensure that the troops' itinerary was not leaked, so that they could raid the Xiongnu settlements, they set off early, and were asked to keep in touch at any time.

There was a cavalry tun in front of the road responsible for opening the road, and Li Su led a large army in the center; Finally, they are responsible for transporting food, arrows and other supplies, but in order to protect themselves, they all ride on horseback, and they are fully equipped with bows, arrows, spears and other weapons, ready to enter the battlefield at any time.

Li Suji's scouts continued to report that the Xiongnu Yiluo had been evacuated and all concentrated within 50 miles around Heyin City, and that the Xiongnu cavalry would not be encountered on the first day, so he ordered the troops to advance rapidly, and they must advance 80 li that day, and raid the Xiongnu Yiluo tomorrow.

In order not to slow down the marching speed of the vanguard troops, the baggage bend did not carry many logistical materials, and a large amount of materials were carried by the troops under Lu Bu's jurisdiction. The cavalry under the command of Lü Bu set off immediately after Li Su, but due to the drag of the baggage, the speed was slow, and it hung about ten miles behind Li Su.

The terrain here is very complex, the north is an alluvial plain, with fertile soil and convenient irrigation, which is a good agricultural area; To the south is a sandy belt, the soil is sandy loam, suitable for forest and grazing; Further to the south is the platform topography, which is a hilly soil and rocky mountainous area, and the soil belongs to the limestone soil type, and the terrain is undulating.

Lü Bu's initial goal was to occupy the north and center, so the troops were divided into three divisions: left, center, and right, with Lü Bu leading a large army in the center and carrying logistics and heavy supplies, marching along the southernmost side of the alluvial plain; Wei Xu led 1,500 cavalry to clear the Xiongnu towns on the northern plains and became the right route army; Cheng Lian led 1,500 cavalry to clear the Xiongnu grazing towns in the sand belt.

The speed of the Huns' evacuation was very fast, and from Lü Bu to the time when the large army set out, the Huns had been evacuated in just three days.

That night, after camping, Lü Bu received reports from Li Su, Wei Xu and Cheng Lian of the three routes, but none of them encountered the Xiongnu Yiluo; In this regard, Lu Bu was very angry, and he marched seventy miles in a hurry that day, but there was no result.

After thinking about it, Lü Bu decided to readjust the plan, Li Su will march quickly tomorrow, raid Heyin City, if it can't be successful, he will continue to move west, go to raid Shuofang City, even if the raid fails, it can block the route of the Huns in Heyin County to evacuate.

Cheng Lian's troops marched west along the sand belt, blocking the route of the Huns' evacuation to the south.

He will lead a large army and Wei Xu's troops to support Li Su, if Li Su does not conquer Heyin City, when he goes to Shuofang, when the Huns relax or chase Li Su, he suddenly kills from behind the Huns, and strives to occupy Heyin City with one drum, or to deal a devastating blow to the Huns.

Lu Bu has lived in the frontier for a long time, and understands the disposition of foreign races to bully the weak and fear the hard, and now that the Huns have withdrawn so decisively and quickly, they must have encountered a threat of life and death, and the main force of the cavalry must have been withdrawn, which made his self-confidence even more inflated, and only occupying Heyin City could no longer satisfy his inflated desire.

Since the enemy was now weak, he had to take the opportunity to occupy Shuofang City as a western warning point, so that he could take Heyin County as the center and Linhe City as the eastern warning point, and the alluvial plain between the three cities would be a good agricultural area, and if anyone planted crops, it would be enough to be self-sufficient and solve his greatest trouble.

As for the sand belt in the south, it is a good grazing area, which can not only increase protection, but also serve as a warning point and buffer zone; The plateau area is not yet within the scope of Lu Bu's plan.

Moreover, the occupation of Shuofang City opened a breakthrough along the south bank of the Yellow River into Shuofang County, otherwise the large army would not be able to detour from the larger sand belt in the south, and could seriously threaten the Xianbei people in the north of the river.

Lu Bu's quick adjustments were strongly supported by everyone; In the past few years, Lu Bu has been intoxicated with Gentle Township, guarding his wife and daughter all day long, only occasionally going out to rob the finances of Xianbei and Xiongnu, and he is not enterprising enough, and he is very proud of running Linhe City well; Everyone has long wanted to expand their territory, and now Lu Bu's adjustment is very much in line with everyone's appetite, which is in line with the demeanor of the "flying general".

Wei Xu, in particular, supported Lu Bu's decision, so that the trade routes with the Xianbei people and the Xiongnu Youxian King tribe were all in their hands, and all the caravans could not bypass it.

In the future, the southern part of their territory will be surrounded by sand, and walking along the plains on the south bank of the Yellow River will be a shortcut, and the risk of the caravan crossing the sand is too high, and it is likely that they will lose all their money.

Previously, there were caravans that set off from Manbo County, bypassing Wudu County and Linhe City and arriving at the alluvial plain of the Yellow River, which made Linhe City lose a lot of fees. This is very much in line with Wei Xu's original vision.

Since Cheng Lian worships Lu Bu as the main prince, his interests are closely related, of course, he hopes that Lu Bu's strength will develop greatly, and he can get more personal benefits; As for those cavalrymen, they hated the Huns and other alien races to the core, and they wanted to kill the aliens and take revenge, and Lu Bu's adjustment was in line with their expectations.

For Li Su, he does not value the advantages and disadvantages of the territory, as long as he can kill, he arrived in Gaoshun for nearly a year, busy training the army all day, learning the art of war, only a few small battles after the year, or in strict accordance with the plan of the military division, the art of war he learned has not been brought into play, this time, he led the army alone, facing the weak Huns, the most is when he shows his skills.

Long-distance running warfare is one of the tactics he learned in Gaoshun, and it is also the tactic that Wei Huo used to use at the beginning, he is ready to take the Huns and test it a little to see how it works.

The decision had been made, and Li Su ordered the baggage to be adjusted overnight, to abandon the carriage, and to transport all the baggage on horses, so that it could carry three days' rations, and to speed up with the army tomorrow.

Subsequently, Li Su summoned the cavalry commander and the commander, announced Lü Bu's order, and encouraged everyone, the rear is Lü Bu's large army, do not worry about the danger of being besieged by the Huns, just go forward to kill, must not fall into the prestige of Lü Bu's "flying general".