In the past, when the Xianbei people retreated, the Wei army watched them leave and did not take any means of pursuit.

Of course, this has a great relationship with the environment in which the Wei army was at the time, and it is very risky to go out of the city to pursue, in case the Xianbei people set a trap when they retreat, and when the Wei army pursues, they suddenly kill a horse gun, then the Wei army's losses will be very large, and it is likely that the Xianbei people will take advantage of the weakness to attack the city, so that the gains will outweigh the losses.

Moreover, the Xianbei people are all cavalry, and if they really take the initiative to retreat, it is completely impossible to leave a chance for the Wei army, which is dominated by infantry, to pursue.

In view of this, every year when the Xianbei people withdrew their troops near the winter, the Wei army only watched from afar on the top of the city and did not take any action.

After the Xianbei people withdraw, this winter the land of northern Jin will stop some, and when the spring flowers bloom next year, the Xianbei people will come back to attack, and it seems to have become a practice every year.

But Cao Liang has the intention of breaking this convention at the moment, and the Xianbei people are attacking every year, which makes the military and people of the state very annoying and tired of coping. Even if the invasion of the Xianbei people did not cause substantial damage to the state, it greatly hindered the economic development of the state.

Originally, after Cao Liang put down the Xiongnu rebellion, he wanted to make Bingzhou his own base, vigorously develop the economy of Bingzhou, increase the population, reserve grain and grass, and have his own place when he confronted the Sima family.

But the Xianbei people didn't seem to want Cao Liang to get his wish, and they constantly harassed northern Shanxi, making Cao Liang tired of coping with it, and had no time to engage in economic and production.

Seeing that the period of the Gaopingling Incident was getting closer and closer, the Sima family frantically cultivated forces in Luoyang and plotted to launch a coup d'état, but he was entangled with these Hu Yi here, wasting time in vain.

It seems that it is time to take the initiative and solve the Xianbei people once and for all, if the Xianbei people withdraw this year and attack again next year, this is not a solution after all.

Wang Ji served as the assassin of the state, did become Cao Liang's solid backing, he not only sent more than 20,000 villagers to the front, but also in Tuntian, also did a very good job, Wang Ji sent back Cao Liang sent back tens of thousands of Xiongnu prisoners of war were imprisoned in Tuntian, to solve the problem of insufficient labor in the state.

The land is vast and sparsely populated, along both sides of the Fen River, is a large area of uncultivated or abandoned farmland, Wang Ji implemented the Tuntian field on both sides of the Fen River, and led the Fen River water to irrigate it, and achieved a lot of harvest, now Jinyang here to support the army in the north of the Jin Dynasty to fight the grain and grass, more than ninety percent is from the harvest of the Tuntian.

Wang Ji has been a Taishou in Anfeng, Huainan for many years, and has a lot of experience, Anfeng is also a border county, adjacent to Eastern Wu, and from time to time to suffer from the invasion of Eastern Wu, Wang Ji not only has to govern the people, but also has to deal with the continuous attacks of Wu, so he is still comfortable dealing with this kind of situation.

With Wang Ji as his backing, Cao Liang has no worries at all, and he can devote himself to the war with the Xianbei people.

The strength of the Wei army is increasing year by year, but the morale of the Xianbei people is declining year by year, and the original unequal strength is slowly getting closer.

In August, although it was not yet time for the Xianbei people to retreat, the signs of the Xianbei people's retreat had already appeared, and some non-combat teams of the Xianbei people had already begun to move and evacuated to the outside of the Saiwai.

But how to attack has always been a problem for Cao Liang, sending troops to intercept the retreating Xianbei army on the front line of the Great Wall?

This seems a little unrealistic, after all, the Xianbei people have more than 100,000 soldiers, even if there have been repeated casualties on the battlefield in northern Jin in recent years, but the emaciated camel is bigger than the horse, and now Cao Liang has not swallowed all the Xianbei people who invaded northern Jinbei, and if he wants to eliminate the Xianbei people, he has to chew slowly and come one bite at a time.

However, where is this first bite, it is indeed a question that needs to be carefully considered, and it is necessary for Cao Liang to move the whole body with a single hair, what Cao Liang needs most is such an entry point, if he does not attack, as soon as he attacks, he must hit the sore spot of the Xianbei people, inflict heavy damage on the enemy, and eliminate the possibility of him coming again next year.

For this question, Cao Liang still consulted Huan Fan.

Huan Fan said leisurely: "Fight the snake and hit the seven inches, in order to kill the snake, to deal with the Xianbei people, you have to find their seven inches, and kill them with one blow." ”

"Where does the gentleman think the Xianbei people are seven inches?"

Huan Fan snorted lightly and said, "The general has been governing the army for many years, and he still doesn't know the urgency of an army?" Why the Xianbei people are in a hurry to withdraw the army, it is not because the grain and grass in the Senai are unsustainable, how can the general burn the grain and grass in the Xianbei people's nest in one fell swoop, this cold winter is enough for the Xianbei people to survive. ”

Robbed the grain and grass camp of the Xianbei people, Cao Liang did not think that Yuan Shao and Cao Cao fought in Guandu, and the strength of the Yuan army was several times that of the Cao army, but Cao Cao finally defeated Yuan Shao and pacified the north because he seized the opportunity to burn the Wuchao army of the Yuan army.

There are so many examples of warfare, and the action of robbing the enemy's grain and grass can often play a decisive role in the development of the campaign.

The supply of grain and grass has always been the shortcomings of the Xianbei people, because the Wei army has always controlled the Yanmen Avenue, and implemented the strong wall to clear the wilderness, leaving no grain for the Xianbei people, so the Xianbei army that entered the northern Jin Dynasty has always had an unsustainable situation of grain and grass, which is also the reason why they had to withdraw to the outside in winter.

But since the grain and grass is the urgent place of an army, the Xianbei people do not pay attention to it, according to the news heard before, almost all the grain and grass of the Xianbei people are stored in the base camp in the clouds, and the Xianbei army left in the clouds has already stored a large amount of dried meat and forage before the autumn to ensure that the withdrawn men and horses have something to eat.

The winter outside the plug was cold, almost to the point of dripping ice, and the thick snow buried everything until the following spring.

During this time, the grass on the grassland was covered with snow, and the horses and sheep all relied on the hay stored before autumn to survive the winter.

And the Xianbei people, who have no horses and flocks, seem to have nothing but the fate of starvation.

Huan Fan's suggestion was to let Cao Liang sneak attack the grain and grass in the Xianbei people's base camp, as long as some of the grain and grass were burned, the end of the Xianbei people would come.