Although Gaodu is only a county seat, its geographical location is very important, it is the second city in Shangdang County after the county governance Huguan, and it is a strategic place in the south of Shangdang.

According to previous intelligence, Cao Liang had appeared in Gaodu, and Gaodu City also gathered a large number of Bingzhou troops, which indicated that the Bingzhou army was likely to concentrate its forces to hold Gaodu, and the Sima army only needed to take Gaodu to completely eliminate the main force of the Bingzhou army.

Therefore, all of Sima Yi's strategic arrangements are to go to Gaodu, in order to prevent the sneak attack of the Bingzhou army, Sima Yi deliberately discharged this long snake formation, and concentrated all the troops on a line, looking at each other, interlocking, hitting the head and tail, hitting the tail should be the first and last, and hitting the waist should be the first and last, before reaching Gaodu, this formation allows Sima Jun to have sufficient offensive and defensive capabilities.

But they didn't expect that when they arrived at Gaodu, Gaodu City turned out to be a city gate open, and there was no figure inside or outside, and it was completely empty.

Sima Shi was afraid of the scheme, so he didn't enter the city easily, but just sent a death squad into the city to check it out, and at the same time sent someone to report to Sima Yi as soon as possible.

Empty city? After hearing the news, Sima Yi couldn't help frowning, what conspiracy did Cao Liang have by giving up such a strategic location?

Although the war of this era is not completely confined to the competition for one city and one place, the two sides still attach great importance to many strategic places, and it is rare to take the initiative to give up strategic places.

This time the attack on Gaodu was in the air, so that Sima Yi had a feeling of overexerting force but flashing his waist, he concentrated his heavy troops to attack Gaodu, intending to complete the decisive battle with the Bingzhou army in Gaodu, but Cao Liang avoided the real and fled without a trace, which made Sima Yi very depressed.

Sima Yi has fought a lifetime of battles, whether it is Zhuge Liang of Shu, Sun Quan and Lu Xun of Eastern Wu, and Gongsun Yuan of Liaodong, these opponents are all famous generals and military geniuses, but an opponent like Cao Liang, Sima Yi has really never encountered it.

He was able to annihilate two armies in a row in three days, but he could also take the initiative to abandon strategic points, and his actions were indeed unheard of and unseen.

The scout team sent into the city has comprehensively investigated the situation in Gaodu City, and it is certain that there is no doubt that Gaodu City is empty, not even a chicken dog is missing, and the scout team has also ruled out the suspicion that the state army has an ambush in the city, and there will indeed be no problems such as fire and water attacks.

But despite this, Sima Yi still had no intention of entering the city, but set up the camp of Sima Jun's army on the bank of the Dan River east of Gaodu.

The Dan River is the second largest river in Gaodu, second only to Qinshui, and the reason why it is named Dan River is because during the Battle of Changping that year, Qin killed 400,000 Zhao soldiers in Baiqikeng, and dyed the river red, so it was named Dan River.

Sima Yi's northern expedition was not to attack the city, Gaodu became an empty city, and Sima Yi had no need to station, he set up his army on the bank of the Dan River, facing the mountains and rivers, and was blocked by the Dan River, at least in the east direction, Sima Yi did not have to worry about Cao Liang's actions.

Moreover, in terms of transportation convenience, along the north of the Dan River, you can directly point to Huguan, and it is also convenient for the movement of the army.

Now Sima Yi's primary task is to track down the whereabouts of Cao Liang and the Bingzhou army, after the Gaodu is in the air, Sima Yi is still looking for the opportunity to fight a decisive battle with the Bingzhou army, he constantly sends scouts to expand the search area, even if it is three feet into the ground, Cao Liang must be found.

But the special geographical conditions of Shangdang are mountainous, so that Sima Yi's search is very futile, Shangdang east is Taihang Mountain, west is Taiyue Mountain, south is Wangwu Mountain, just these mountains, enough to hide millions of soldiers, if Cao Liang escaped into the mountains with an iron heart, Sima Yi may not be able to find even if he looks for ten years.

Such a battle is undoubtedly difficult to fight, divide the troops and advance, it is easy to be broken by each other, concentrate the troops, the other party is hiding again, and they don't even take a look at each other, how can this battle be fought?

In this case, Sima Yi is indeed very helpless, Cao Liang has been running the state for several years, and naturally knows the terrain here, in fact, the most important thing to fight a war is three points, time, location, and people, and now Cao Liang has an advantage in these three aspects, so the situation is very unfavorable to Sima Yi.

Of course, the main reason is that Sima Yi has put all his energy in managing the territory in Luoyang Chaozhong and Guanlong over the years, and those who get Guanzhong win the world, Sima Yi's attention to the Guanzhong region has always been the highest, and he has always firmly held the Yongliang land in his own hands.

Relatively speaking, his infiltration of the state is slightly insufficient, a few years ago when the Xiongnu rebellion, Sima Yi intended to let Chen Tailai serve as the general of the Xiongnu assassin and protect the Xiongnu, wanting to control the situation in the state.

If Cao Liang had not come out to stir up the situation at that time, it was likely that Bingzhou would have been able to be included in the Sima family's sphere of influence from now on, but unfortunately, Cao Liang's birth took away the control of Bingzhou from the hands of the Sima family, and turned Bingzhou into a base against the Sima family.

At present, Sima Yi's intelligence sources in Bingzhou are relatively weak, and most of the time he can only send scouts to spy on the enemy, and it is difficult for a scout who is not familiar with the place to obtain valuable information, no matter how high the level of reconnaissance is.

Just like now, Cao Liang can know Sima Yi's every move, but Sima Yi can't even find Cao Liang's shadow, and the asymmetry of intelligence information is destined to make Sima Yi's actions difficult.

Sima Jun was stationed in Danhe, there was no battle to fight for two consecutive months, the consumption of 100,000 military supplies was also very amazing, and the weather was getting hotter and hotter, and the morale of the army was inevitably a little slack, even Sima Yi couldn't help but be a little shaken, and was considering whether to retreat first, and wait until the weather cooled down in the autumn to march.

Of course, if he marches again, Sima Yi will definitely do a good job of the military intelligence system first, and without accurate and detailed information, fighting a war is like a blind man touching an elephant, and such a war will be a complete mess.

However, at this time, Sima Yi suddenly got a news, that is, Cao Liang appeared in Huguan, according to the person who sent the information, this was what he saw with his own eyes, Cao Liang and Huan Fan appeared in Huguan City at the same time.

Sima Yi's eyes lit up suddenly, this news was simply too important to him.