Four days later, in the afternoon, Zhang Yue led his troops to Huai'an County, Gyeongju, which was set up as Huai'an Prefecture in the Tang Dynasty, that is, the Prefecture of Prison Prefecture, to house the Turkic subordination, and now it has been reduced to Huai'an County, which is a mixed place of Tibetan and Han people.

The dilapidated county town is very low, located in the hilly area of the river valley in the east of the Baima River, between the mountains of more than ten miles north of the county seat, there is still a section of the ancient city wall of the Wei and Jin dynasties, but no one is stationed, it is weathered badly, and now it is not one in ten.

Therefore, this mountain is called Guchengling, more than 20 miles to the north is the Maidaochuan trade road, Zhang Yue's military camp is stationed under this Gucheng Ridge, the camp is arranged, and the soldiers have settled down. Li Yanxing, the commander of Huai'an County, received the military order, led the county commander, the chief bookkeeper, and the county lieutenant, and led the government to send dozens of carts of grain and hundreds of sheep to the army.

Zhang Yue was overjoyed and asked the judge to accept all the orders, and Xuan Chongwen and Li Chuyun took over the grain and were responsible for military logistics. Since this is used as a base camp, then the officials of Huai'an County who come to the army will have to meet with them, and it is very costly to transport the food needed by two or three thousand soldiers from Yanzhou, and it is best if they can supply it on the spot, and the summer harvest has just begun, and there will be no shortage of food.

The four chief officers of this county were quickly brought into the big tent of the Chinese army, and Feng Qianhou was accompanied by him, Zhang Yue beckoned the four of them to sit down, and asked after letting the soldiers serve tea: "Is the price of salt in this county stable?" Are the Tibetan tribes on the west bank of Machuan still stable? Did you take part in the raiding of past traders? ”

"After the new assassin Shi Zhai Congen took office, he visited the county, pacified the Tibetan people, and has been committed to maintaining the salt price set by the chapter inspection, so the Tibetan people are very grateful, and they did not make trouble, and it is impossible not to participate in the looting, this is purely the work of the robbers, and has been active in the Qinggangling, Maidaochuan to Baiyu Mountain, Luoyuan County County Commander has reported to the state government many times, saying that the traces of the robbers have been found, and the county has only heard of it, and has not been aware of it." Li Yanxing, the county magistrate, replied.

"And when was the last time the robbers were on a sortie?" Zhang Yue continued to ask.

"It is said that nearly 1,000 horsemen were dispatched to attack the tax card in the Huamaliang Mountains at the beginning of this month, and they have not appeared since, and no caravan has dared to go north recently."

"Could it be that this Celestial Wolf has grabbed enough and disappeared?"

"Patrol Zhang sent someone to Luoyuan County to inquire, maybe there will be a harvest." Li Yanxing thought about it and said with some uncertainty.

"What Li County Commander said is very true, nearly 3,000 people from the headquarters are stationed here, and Li County Commander is needed to help prepare grain and grass, of course, Yanzhou will also bring some of it, this is no problem, right?"

"The state government has arrived, and Zhai Tingshi has rushed to assist with his troops, and the county should handle this matter by itself." Li Yanxing opened his mouth to reveal an important news.

Zhang Yue was overjoyed when he heard this, and politely greeted a few people and sent them out of the barracks. After dinner, Zhang Yue convened the commanders of each battalion to discuss the account, and everyone agreed that it was necessary to find out the whereabouts and purpose of the Hun Tian Wolf.

This is the first time that Zhang Yue has led the troops independently since joining the army, recalling that in the past, Hebei went to fight against the Liao army and went south to take Yuezhou, in fact, it was a tailwind battle, and this time to suppress bandits, training is more important. Although the time was a little tight, Zhang Yue didn't feel any pressure.

Zhang Yue immediately ordered, tomorrow with Xuan Chongwen and Ming Jinrong each led 50 horses, carrying goods and pretending to be a caravan as scouts, first to Luoyuan County to understand the situation, reconnoiter the surrounding terrain of Luoyuan County, and the valley at the southern foot of Qinggangling and Baiyu Mountain, and re-survey and map in detail.

"Surveying the terrain and surveying and mapping maps is the duty of scouts, why do you need to be the main general himself?" Feng Qianhou said he didn't understand.

"Their reconnaissance skills are okay, but what about drawing...... I'm afraid it's going to be terrible, and I'm going to take charge myself, so I don't have to ask for instructions back and forth, so I don't miss any clues. Zhang Yue had no choice but to explain, and then said: "You may not be convinced, but I do have a new type of drawing technique here, and I will teach you it now when I have some time, and I can pass it on to officers and scouts at all levels in the future." ”

"Is it so mysterious? Isn't it just a map! I used to be a tooth soldier, and I often did this kind of thing......" Ming Jinrong shouted and questioned.

Zhang Yue didn't pay attention to it, asked Chen Jia to find a large piece of white cloth and hang it on the wall, and then picked up his own special charcoal, first of all, he explained it systematically, and then explained the application of the scale, that is, to reduce the actual distance to the scale on the map, and when looking at the map, the actual distance can be calculated only according to the scale. The algorithm is easy, list the formulas for them, and the officers can understand them, but it's too early to learn.

Then there are the terrain symbols, which are a bit more complicated and are divided into small subjects such as feature symbols, feature colors, etc. He illustrated various geographical symbols such as houses, roads, rivers, and forests, and explained what they represented.

Then there is the geomorphological principle and characteristics of the contour line, the contour distance, etc., in fact, there are also elevation notes, map orientation and magnetic bearing, which is only needed by artillery, and can not be learned for the time being.

There are also types of contour lines: this is divided into four types: the first curve, the gauge curve, the intermediate curve, and the auxiliary curve, in order to better draw the horizontal plane at different altitudes and the intersection line with the actual ground, so as to accurately calculate the actual data of mountains, rivers, valleys, and complex terrain such as shady slopes and sunny slopes according to the map, which is very important.

In fact, there are warp and weft lines, but this one is too advanced, and it will frighten them when it comes out, and just this has already made the officers dizzy, so Zhang Yue had to omit it.

After all, he is an officer who can become a commanding officer, and everyone's learning ability is good, and their consciousness is also high.

"I've got it completely, it's just ...... This is a masterpiece, but where did you learn it? Feng Qianhou pulled Zhang Yue's sleeve, curious about the baby's general question, forcing Zhang Yue to tell another big lie.

Before dawn, Zhang Yue and Xuan Chongwen and Ming Jinrong ordered one hundred and fifty horses on time, took off their military uniforms and armor, and only wore a cyan suit, equipped with knives, guns, bows and arrows, and set off with five carts of goods.

Turning over the slopes and hills of the ancient city ridge, below is the river valley plain on both sides of the Luoshui, and the so-called Maidao River is here. Because the thieves often blocked the road and moved goods here, it was called road money, so it became famous in this place.

Buy Daochuan, has always been a treacherous place, a few people have to observe the terrain separately, surveying and mapping into drawings to bring, the result of this road is very slow, the way is full of barren mountains and mountains, not only did not see the business travel, but also never saw the whereabouts of the robbers, it was a day's journey but walked for five days to Luoyuan County.

Luoyuan County is also a dilapidated and low-rise small city with a small population in the surrounding townships, mainly concentrated near the county seat, or living in the city. Because it is close to the border of Yanzhou, there are many caravans in and out of the city, which has led to the prosperity of commerce in the market, and there are many shops, restaurants, and brothels in the city, and the market is much larger than other ordinary county seats.