"The sense of direction of the devil ......, of course Your Majesty is not, I was forced to die to survive! How can a large army go out on such a child's play! ”

"Tell me how you can do it!"

"I think that if you want not to lose your way in the vast grassland, you can only rely on experienced guides, or scout veterans who are familiar with the terrain of the grassland!"

"Guide, veteran, yes, but it's just decent, is there?"

"There is also a way to conduct a detailed reconnaissance of the area where the battle or march will be carried out in advance, and at the same time draw a relatively accurate map, and mark the hills, valleys, rivers, sand dunes, and woods as much as possible as a reference when the army is marching!"

"This will take more time and pay for preparation in advance, but the benefits are more!"

"Tell me about it, I'll listen!"

"First, there is a relatively accurate map to avoid the loss of the army, and as long as you can read the map, even a guy with a very poor sense of direction like Chen can judge the general direction according to the map!"

While speaking, Guo Rong took out the map contributed by Wei's Qianhu Que Le Dade and handed it to Li Yu.

"What is this?"

"This is a map we captured after a battle with a Tibetan cavalry squad in Xizhou, Chenhe Fourteen...... Yan Qing was ...... by virtue of this captured map and Yan Qing's natural sense of direction."

Hearing this, Emperor Taishang suddenly couldn't help but laugh.

"What a talent!"

"Your Majesty, don't get me wrong, Yan Qing is really born with a good sense of direction, from Xizhou to Chang'an, thousands of miles, Yan Qing has never judged the direction once, plus he is petite and flexible, easy to hide, except for being a little thinner, he is simply a natural army scout!"

Li Yu: ......

Yan Qing: ......

Li Yu looked at Yan Qing with some sympathy, looking at the little girl's appearance, it was no longer Guo Rong who was not married, the problem was that Guo Rong had no mind at all.

Guo Rong's brain is not a tadpole at all, if his attention is not here, even if Yan Qing is unarmed, he may not be able to notice that Yan Qing is a woman when he lies on his bed!

That's it, the critical time still depends on the emperor!

"Go on, Guo Rong, is there anything else?"

"Yes, the second is that the army can make a marching route in advance according to the terrain, rivers, etc. detailed marked in the map, and plan the camping site in advance!"

This time, Li Yu is really a sight to behold!

It is true that he is not good at military strategy, and he has no experience in commanding large armies, but when he was the prince, he read and studied all the military books such as "The Art of War", "Sima Fa", and "The Mirror of the Six Armies".

The army is not traveling with three or two people, just find a place with a corner to live for a night, and it is basically a practice to camp for thirty miles a day, as long as the leader is not a waste of snacks, this is necessary.

Camping, setting up tents, burying pots and cooking, all of them are indispensable, and the next morning they are all packed up, thirty miles seems not much, but in fact it is a lot.

In the direction of the destination, those who can travel 30 miles a day are all proper and strong troops!

Because outside of these fixed hours, the most difficult thing is to choose the route of the march and the location of the camp, you must know that the location of the camp is very particular, and not every place can be camped.

First of all, it is necessary to have a water source, and if there is no food and grass for three days, the army's morale will be chaotic, but if there is no water for one day, it will be enough.

It is necessary to have firewood and grass that can support burning, and theoretically it is possible to nibble on the cake with cold water, but it can only survive, and the role of hot soup and hot water in improving the morale of the army cannot be underestimated.

To avoid the dense forest for fear of fire attack, to avoid depressions for fear of flooding, to prevent sneak attacks, you need to choose a place that is easy to defend and difficult to attack, exaggerated and even erect watchtowers, dig deep trenches, and put down walls in the trenches, after all, there is a camp to let the soldiers rest at ease.

In short, water, fuel, and terrain are all indispensable.

The reason why famous generals are famous generals is that they have enough experience, ability, and vision to coordinate troops and horses, and can send scouts to reconnoiter in advance, select the marching route in advance, and select the camp site in advance, so as to ensure that the soldiers are always in a high morale and peak state.

In Li Yu's opinion, the power of Guo Rong lies in the fact that even a mediocre general, as long as he has such a marching map, he can infinitely approach or even surpass those famous generals.

Of course, it is only on one side of the march, and as for the other aspects, it must be what it should be, but it is very rare to be able to do this one.

At this point, Li Chen's evaluation of Li Yu has improved again!

Through Guo Xin's letter and Guo Rong's performance today, Li Yu can draw a conclusion.

Guo Rong may not be the bravest of Anxi's army, nor may he be the most skilled in battle, but Guo Rong must be the person Guo Xin thinks is most likely to bring Anxi's last letter back to Chang'an.

Similarly, in the case of being full of thoughts about returning to Anxi to save people, to have such careful thinking and steady tactics, in Li Yu's opinion, Guo Rong, who is only 19 years old, has a bright future, as long as he is given enough conditions, the future may not be another Li Jing or Guo Ziyi!

It's just that Li Yu wouldn't know that Guo Rong just followed Li Rui for more than a month, and directly copied the military maps of later generations based on Li Rui's experience......

However, these are not important, the important thing is that Li Yu thinks Guo Rong is very good!

At the same time, he also read through what Guo Rong emphasized today, and read that Guo Rong did not say that he must die in the Hexi Corridor, of course, people with such iron heads cannot return to Chang'an.

Why did Guo Rong work so hard to introduce his experience after entering the grassland from Yizhou, why he introduced himself to the precautions and personal experience of the grassland march, why he mentioned the grassland, why he mentioned the grassland, why he mentioned the lost, why he mentioned the map.

Maybe Guo Rong's subconscious thoughts and judgments, or Li Chen's judgments, belong to Guo Rong's temptation that he is afraid of being vetoed, that is, a small trick.

But no matter which one it is, Li Yu doesn't care, the king has the way of the king's majesty, and the courtiers have the way of the courtiers, whether it is a small trick or a subconscious, what is shown is Guo Rong's loyalty and ability.

Li Yu himself is not very good at military strategy, but he also understands that Anxi is so easy to fight back!

In order to ensure that the Hexi Corridor is not lost, the Tubo people stationed more than 100,000 troops in the Hexi Corridor, and when necessary, they can also get the support of the Tubo Plateau and the northwest province of Hexi.

Three years ago, Wei Gao ambushed the Tibetan minister Wei Nongre, and more than half of the 100,000 troops in the Eastern Border Province lost more than half, and even the Mangre became a prisoner, and now he is still retiring in Chongren in Chang'an.

This time, however, the city reacted with surprising swiftness, and after a brief discussion, the city sent a capable Chisu Rinche to take over as the ambassador of the Five Realms of the Eastern Realm.

At the same time, he began to desperately send troops and horses from all over the east to the five provinces, but in less than half a year, the soldiers and horses lost by the five roads in the east were replenished by the Tubo from all over the place, and the strength was even better than before.

In a word, now in Datang, it is not difficult to harden Tibet, but it is basically impossible to penetrate Hexi, and if you want to rescue Anxi, you must find another way.

Guo Rong found another way to choose the grassland, which is the best proof, Li Yu can see that Guo Rong's loyalty is not necessarily himself, and it is likely to be more of the Anxi Army and the Tang Dynasty.

However, for Li Yu, who regards himself as a Datang, Guo Rong's loyalty to Datang is equivalent to being loyal to himself!

There was no big problem on Guo Rong's side, Li Yu picked up his sister Li Xuan's letter and began to read it carefully.