After observing for a while, Cao Yue's face immediately changed: "It's the Jiannu cavalry!"

The telescope was made by Cao Yue when he was in Beijing. During the Ming Dynasty, glass products were no longer a rarity and were easily available, and many people with bad eyes wore glasses to improve their eyesight. With the current glass, Cao Yue, who had been a soldier for many years before the crossing, of course thought of a telescope, which has a very large military use. If you don't have a ready-made one, you can make it with what you've learned.

Generally speaking, only junior high school physics knowledge is needed to make a simple telescope, and Cao Yue did not have much effort to make several sets of monoculars that can be used and are simple and easy to carry. Binoculars and more complex telescopes with rulers, Cao Yue has not been able to make them yet.

Several of Cao Yue's important cronies were equipped with such monoculars, and users immediately discovered the great usefulness of this object. Their admiration for Cao Yue also rose to a new height with the small telescope.

In the eyes of some, Cao Yue has become synonymous with omnipotence.

Through the binoculars, Cao Yue spotted the Jiannu cavalry that suddenly appeared near the Great Wall a few miles away.

There was no indication that the other party had spotted them, which was a lucky thing.

Cao Yue's family troops were all dressed in snow camouflage, white clothes, white cloaks, and white hats, even if they were not far away, they might not be able to find such people on the snow.

Cao Yue also immediately issued an order for emergency response, and nearly five hundred family members followed him in an orderly manner and hid in a forest.

Cao Yue also made a decision immediately after briefly discussing with several leaders of the Jiading troops. He led a group of Jiading, the first to rush back to Datong, set up defenses, the new leader of the Jiading troops, Cao Xin, led a hundred people to delay the speed of the Jiannu cavalry, and waited for an opportunity to sneak attack.

Cao Xin is a distant brother of Cao Yue, who is very clever and outstanding in martial arts, and has been fighting with Cao Wenzhao and Cao Bianjiao. He took on a heavy duty in a battle and returned home to recuperate for two years. Now that Cao Xin has recovered, Cao Yue asked him to lead his own troops. Cao Yue has already promoted the other capable personnel of the Jiading army to important positions, and the leaders of the Jiading troops can only be selected.

Today is also the time to test Cao Xin's ability. Cao Yue knew that the Jiannu cavalry appeared in the defense area of Datong Town this time, and they must have come towards Datong. Of course, Cao Yue couldn't personally stop the Jiannu cavalry, he had to rush back to Datong as soon as possible and arrange defenses.

There are also people with extremely high IQ among the Jiannu, they may feel that the weather is cold, and the snow is covered everywhere, this kind of season that everyone thinks is not suitable for military operations, our Ming army will definitely not be guarded against, and they want to come to a sneak attack without knowing or knowing. Cao Yue could even conclude that the appearance of the Jiannu cavalry near Datong this time was coming at him, and it was a planned revenge after Jiannu knew that he was guarding Datong.

Today's Datong town army is not on high alert, if it doesn't rush back as soon as possible to make arrangements, maybe it will be caught off guard by Jiannu, or Cao Yue will suffer heavy losses.

After assigning the task, Cao Yue ordered the more than 300 family members who went back with him to hand over all the grenades they carried, that is, the wooden-handled fire dragon cannon that the family members said, to the more than 100 people led by Cao Xin, who stayed behind to block the attack.

After handing over the wooden-handled grenade he brought, Cao Yue immediately led more than 300 families to Datong as quickly as possible.

It took more than half a day for Cao Yue to rush back to Datong with three hundred tired dog-like families. When he arrived in Datong, it was already dark, and the city gate had already been closed.

After entering the city, he immediately ordered his subordinates to urgently summon the officials and generals of Datong to discuss matters with the general army located in Datong City. Originally, Cao Yue set up the general army in the camp outside the city, but after the weather turned cold, he still listened to the advice of Wei Daben, the prefect of Datong, moved the line back to the city, and moved all the men and horses of the first battalion to the city.

Soon, Wei Daben, the prefect of Datong, and Cao Jie, the general of the first battalion, as well as some other officials living in the city, were summoned to the general army.

"Mr. Cao, what happened?" Wei Daben, the prefect of Datong who entered Xingyuan, saw Cao Yue's solemn face and couldn't help but ask out loud.

Because of the cold weather, Wei Daben had already fallen asleep, and after receiving Cao Yue's emergency summons, he immediately guessed that something urgent must have happened.

"Lord Wei, when the general led his troops to inspect the border pass today, he bumped into the Jiannu cavalry near the Outer Great Wall, and they were less than a hundred miles away from Datong. The Jiannu cavalry must have come from a sneak attack on Datong, and the general would not dare to have any delay, leaving a group of men and horses to block the enemy, and immediately rushed back to Datong. According to the general's estimate, Jiannu will be able to kill Datong City as soon as tomorrow evening to noon the day after tomorrow. ”

The Great Wall of the Ming Dynasty is west of Juyongguan, divided into two lines in the north and south to meet in Shanxi Partial Pass, and is called the Inner and Outer Great Wall.

The Outer Great Wall is the northwest of Juyongguan through Chicheng, Chongli, Zhangjiakou, Wanquan, Huai'an and enters the Tianzhen, Yanggao, Datong and Zuoyun along the junction of Inner Mongolia and Shanxi, reaching the partial pass and the river meander; The inner Great Wall enters the Lingqiu and Hunyuan of Datong from the southwest of Juyongguan through Yixian, Hunyuan and Fuping in Hebei Province, and then passes through Yingxian, Fanzhi and Shenchi to Laoying.

The Jiannu that Cao Yue met was already near the Outer Great Wall, and it is estimated that their itinerary in the past period should have crossed the Outer Great Wall, and perhaps they would have arrived near the Inner Great Wall. The Outer Great Wall is remnant of many passes, and Jiannu often crosses through the broken passes.

Hearing Cao Yue say this, Wei Daben and Cao Jie were suddenly shocked into a cold sweat, they never expected that in such bad weather, Jiannu would lead the army to attack Datong for a long time. But fortunately, when Cao Yue led his troops to patrol the pass, he accidentally ran into Jiannu, and was able to escape and return to Datong to arrange defenses. Although Wei Daben has not really seen Cao Yue's ability, and he also feels that Cao Yue is a little too young, but judging from Cao Yue's performance during this period of training, this is a very capable general.

The situation is critical, and now only Cao Yue, the general soldier of Datong, can rely on, and the 50,000 recruits just recruited.

Wei Daben was also a decisive person, and he immediately said to Cao Yue: "General Cao, how to deploy defenses and how to resist the enemy are all up to you. Just say it directly, what you want the government to do, as long as the government can do it, you will do it, and you will never dare to refuse. ”

In the Ming Dynasty, the status of civil officials at the same level was much higher than that of military generals, but Cao Yue did not have this concept, he subconsciously believed that the military generals who controlled the army were the most vocal, so when discussing things with Wei Daben, he never accompanied him to be careful, and he was commensurate with the lower officials.

And Wei Daben surprisingly didn't care about this, or he didn't show his concerns.

"Okay," seeing Wei Daben so crisp, Cao Yue couldn't help but admire, and immediately said his request, "Ben will hope that the prefect can transfer the people outside Datong to the city before Jiannu arrives in Datong, and prepare the corresponding food." The Jiannu expedition rarely carried military rations, and they always fed on the spot to feed the war. This time, Ben will not give them a chance and find a way to do it. ”

After hearing this, Wei Daben frowned slightly, and immediately stretched out, and agreed very happily, "Okay, then the mansion will prepare overnight." We must find a way to mobilize the people from outside the city into the city as much as possible, and prepare enough food. ”

"That's great, with such vigorous cooperation from the Wei Governor's Mansion, Ben will be fully confident that he will repel Jiannu, and even severely damage them under Datong City!"

"Chief Cao, if there are no other orders, then the mansion will immediately make preparations!" Wei Daben said, arched his hand at Cao Yue, and immediately ordered those officials under him to follow him to prepare overnight.

Zhang An, the supervisor of Datong Town, also came a little later, and he was not proficient in military affairs, and now only Cao Yue can be relied on. He also repeatedly assured Cao Yue that he was willing to provide all conveniences as long as he needed to fight the war. Zhang An's statement also made Cao Yue very pleased.

After discussing privately with Zhang An, he also reported the news of Jiannu's attack to Beijing in the form of an urgent report in their own names, suggesting that the imperial court strictly order the garrisons of various prefectures near Beijing to be on strict alert to prevent Jiannu's sneak attack.

At this time, the leading generals of various departments also came to Cao Yue's line one after another.