Xu Ping stood at the bottom of the Sandu River valley and watched Lu Fang lead people to measure the river water.

The northwest area is broken, with mountains and ditches. Farming in spring and summer, fighting in autumn and winter is not only to adapt to agricultural production, but also to the reasons for geographical restrictions here. This terrain is large enough to march along the river valley, and only a few sections such as Pingxiang Road are marching in the mountains. If there is too much water in the river, it is difficult to advance. If there is a heavy rain or a mountain torrent, it is even more devastating disaster. The reduction in rainfall in autumn is still not a suitable season for combat. First, there is a lot of water in the river, which restricts movement. Another way is to soak in summer rain, the soil at the bottom of the valley and on both sides of the river will be loose. A few people have nothing to walk, and the large troops will have various accidents. The tribal army under Yu Zang Huama is a local native, so they naturally understand this truth. They will not go south until the land in the valley is dry.

There is a lot of rain this year. According to Xu Ping's estimate, the war broke out in early winter. If there is less rain and the weather is dry, the ideal combat time is about nine or October. There may be heavy snow in winter, which also has an adverse impact on the march. When there is more rain this year, the war can only be postponed. The time window for combat is only one or two months.

If you leave the mountains and go to Dangxiang, and no longer be restricted by the valleys, you can fight almost all year round.

Time and geography are insurmountable difficulties and can only be adapted.

This time, I went to Sanduchuan to hunt for autumn. One was to inspect the foreign tribes near Fuqiang Village to shock them so that they would not dare to cause trouble when the war broke out. The other was to come to Sanduchuan and personally inspect the combat plan formulated by Wang Kai and his men.

After measuring the hydrology, Lu Fang stepped forward and reported: "Ji Shuai, the water flow in the valley has been smooth and the water is not deep. It is expected that in another half a month, it will not hinder the passage of the army."

Xu Ping nodded and pointed to both sides and said, "Send people to the two sides to see if there is any loosening."

Lu Fang promised to send people to both sides of the valley to see if the cliff wall is solid, which is beneficial to climbing.

Wang Kai took out a map and pointed it to Xu Ping, and said, "Jie Shuai, there is a cliff not far ahead of him, not far from the west bank. If the soldiers are more agile, they can go down to the valley from there."

Xu Ping looked at the gentle slope and said it was smooth, but in fact it was just a small way to allow people to fall from above. This area is full of earthy mountains on the Loess Plateau. The valley was cut very deep by the water over the years, and the two sides were steep. Ambushed on both sides of the straits would inevitably rush from the mountain to the valley to cut and surround the enemy. Every gentle slope that could be up and down must be marked.

He took out his telescope and looked at the gentle slope for a while before saying, "There are some risks in that place. If it is not a last resort, don't arrange soldiers to go up and down from there. You have to set up the orders of these up and down gentle slopes. If you can pass through the A, B, C and D, there will be some risks in the next level. If the lowest level is absolutely necessary, don't use it, so that the commander will have a choice. Then follow the battle department and decide which ones to use."

Wang Kai Yingnuo wrote down Xu Ping's words and prepared to check them in detail again.

Xu Ping had already made a large number of telescopes placed in Qinzhou's armory, but only a few senior officers such as Sang Yi and Gao Daquan have used them, and others are not aware of the existence of this kind. They have to wait ten days and half a month before the war begins to launch and practice. The mountain telescopes around Qinzhou are actually not very effective. When the mountains are out of the mountains and facing the flat desert grasslands in Dangxiang, the telescopes can play their greatest role. There is no need to use them in large quantities to prepare for Dangxiang.

He went upstream along the Sandu River, looked at the terrain in the valley, and re-examined the battle plan made by Wang Kai and others. A group of senior generals including Sang Yi, Gao Daquan and Cao Keming made the last inspection of the plan.

The two sides of the strait are mostly trees with leaves falling, with branches growing everywhere and messy, which is not as good as the nearby Qinling Mountains and Xiaolong Mountains. It is extremely difficult to pass through this kind of forest army, and it is not conducive to hiding people. To attack on both sides, it takes some effort and effort. Below the Jade Pass, the Sandu River Valley Road is about 100 miles long. Yu Zanghua Ma Army and horses come, and it takes two or three days to march in the valley. Taking advantage of the opportunity of the night, it is relatively easier to move and arrange ambush.

When he walked to a place where the tributary flowed into, the place was flat and wide. Wang Kai said: "There was a small village here, but it has now been abandoned. Going upstream along the river that flowed into it, the Longzhong people's tribes fell. Gao Du pointed out that if the General's Mansion agreed, he could occupy the Longzhong people's place in advance and ambush the troops there, and then follow this river to the Sandu River."

The Longzhong tribe is a small man who has already accepted the ranks and surrendered. Yesterday, Xu Ping inspected Fuqiang Village and his leader was there. However, the place they lived was quite remote and no official in Qinzhou had been there.

Xu Ping thought for a while and said, "Since that's the case, let's arrange for Guiming Shenwu's large group of troops to be stationed in the Longzhong tribe. When the war begins, my general's tent will be set up there. But be careful and do not disclose the news. Liu Zhiyuan, you can get more money from the General's Mansion and give them generous gifts to their leaders and the people in the tribe. You must not make them dissatisfied. Once you have negotiated with their leaders, Guiming Shenwu Army will send a large army to station. People in their tribe are allowed to enter and not leave to prevent the news from leaking."

Liu Hu and Gao Daquan agreed with each other.

Xu Ping looked around, looked up and saw that it was getting late, and said to everyone: "Let's rest here tonight. We will set off tomorrow morning and go to Qingjichuan near to the darkness and return to Qinzhou. For the regular war, we must not only be familiar with geography, but also list every step of the war according to the terrain. More importantly, we must distinguish the joints according to the geography. The most important thing is to do things, divide this big battle into small battles with joints, and make it clear. What small battles should each army and command participate in and which joints should be completed, and what joints must be pre-determined.

It was like the place where this small river flowed into, and we followed the valley entrance for dozens of miles, and we counted the level of this place. There is no doubt that when the war broke out, this was an important battlefield. If the Guiming Shenwu Army inserted into the Yuzang Huama belt, occupied this place and urgently set up a camp, there were three joints. After receiving the order to attack, it was a joint here. Defeating the enemy's occupation of this place was another joint, and setting up a camp was another joint. Wang Jianjun, if you draft the combat order, you should follow these joints to make the commanders clear about the battle."

Wang Kai promised.

Xu Ping said again: "The most fear of chaos in combat. If one side is in chaos first, then half of it will be defeated. From Biyu Pass to the entrance of the valley, it stretches for a hundred miles and is divided into dozens of battlefields. How to be organized? It is far from enough to rely on soldiers to pass military orders alone. The military orders must be organized clearly. Every commander who participates in the small battlefield clearly knows where they are going, when they arrive, what to do after they arrive, how to do it, and how to achieve the military orders. Only in this way can our 100-mile valley road, the 20,000 to 30,000 soldiers and horses participating in the battle form a whole. Never be the same as the previous imperial guards. The dozens of battalions of troops came out and rushed to a place, with no clues."
Chapter completed!