Seeing that the ground was white, but the sky was covered with dark clouds, Zhu Gaoxuan was a little worried that the next snow would be even bigger.

That is, more than an hour later, the sleigh came to Xi'an.

"Hahaha~ I said why are the magpie branches chirping this morning? It turned out that His Royal Highness King Liang had come down, and the lower officials had lost their distance. ”

Geng Zhong, who was informed, stepped on his skis and rushed with a spear on his back, and performed an emergency stop in front of Zhu Gaoxuan's sleigh to show off his skiing skills.

There is one thing to say, these ancients who practiced martial arts learned to ski really fast, and they all skied better than Zhu Gaoxuan.

"Commander Geng, your skills in opening your eyes and telling nonsense are getting better and better.

It's freezing on this day, even if the magpie comes, it will be frozen to death, you let it call a look. ”

"Haha~ Even if it freezes to death, it has to call twice first, His Royal Highness is the benefactor of our entire Xi'an Mansion."

"You've learned to be poor."

Zhu Gaoxuan stood on the sleigh with a smile and waved his hand to Geng Zhong.

Although Zhu Di stipulated that the prince was not allowed to make friends with the generals in the army without authorization, there was actually no strict punishment, and his other elder brothers were even more familiar with the founding generals.

And when he was in Xi'an Mansion and treating the smallpox plague, he was still familiar with Geng Zhong and other generals.

It's just that now he still has Lan Qiang and Cao Xing by his side, and he doesn't want to be too close, so he quickly changed the topic and said:

"Commander Geng, don't talk nonsense, let's go directly to Helan Pass and see the situation."

"Okay."

Geng Zhong also recognized it, Chong Lanqiang and Cao Xinghe nodded, turned around to greet the skiing military household behind him, and turned around to lead the way.

Skiing directly around the side of the Weisho City in Xi'an, but less than two advances, it is the end of the Xi'an Mansion level, which is a newly built section of the Great Wall.

At the ends of the Great Wall, which is less than two miles long, are two steep mountains, and in the middle is an avenue almost 100 zhang wide.

After three more miles of skiing along the avenue, the sled convoy had to stop.

The snow ahead is thin!

It's unreasonably thin!

"Geng Zhong, how did the scouts you sent repay?"

"There is no trace of the Northern Yuan people within thirty miles, and the scouts are still continuing to reconnoitre."

Hearing Geng Zhong's report, Zhu Gaoxuan felt even more wrong, and continued to ask, "No trace of the enemy?" How does the snow in this snow area subside? ”

"It's been found out, it's sand!

Sand in the desert across Helan Mountain. ”

"In winter, the snow melts quickly in the desert, so for thousands of years, nomads have also come up with a set of methods to quickly melt the snow."

"Sand? Yes, sand can indeed speed up the melting of snow. ”

Saying that, Zhu Gaoyuce quickly stepped forward into the area with thin snow, squatted down and checked.

groping on the ground with his gloved hand for a while, grabbing a handful of dirt with sand, he muttered: "Sure enough~"

On snowy days, sprinkling sand or cinders on the road surface can indeed speed up the melting of snow, although the effect is not as good as salt, but it is a good way.

First, when the pressure is constant, increase the roughness of the contact surface and increase the friction to prevent slipping, which can make it more convenient for people to travel.

Second, the color of sand or cinder is relatively dark, and it is easy to absorb heat, which can speed up the speed of snowmelting.

The sand in the dirt in his hand was the darker one.

Sure enough, even if the ancients did not understand scientific principles, they also knew how to summarize life experience, and many things could be done well even though they only knew them but did not know why.

For example, this method of melting snow, Zhu Gaoxuan did not think of it.

"Since there are no Northern Yuan Tartars within thirty miles, let's take a look forward."

"Yes, but not a mile out of this mountain pass."

Geng Zhong agreed, but he also had requirements, and Zhu Gaoxuan was also a person who spared his life, so he naturally agreed.

Zhu Gaoxuan, Geng Zhong, Lan Qiang, and Cao Xing rode forward together on the war horses prepared by a post not far away, and the others did not have war horses, so they waited here.

Immediately, Zhu Gaoxuan looked at this passage and sighed in his heart at the magic of nature.

This passage is like a god in the sky, with a magic pen drawing magical lines on the ground.

The passage slowly shrank from about 100 zhang at the beginning, and the whole passage was less than three zhang after ten miles of advancement, and there were steep and steep cliffs on both sides.

There are more than three miles of small roads, and there is a husband who is not open to the land.

Seeing such a favorable location, Zhu Gaoxuan couldn't help but ask: "Commander Geng, with such good terrain conditions, why doesn't Xi'an Mansion set up a post here?" ”

"Your Highness, rest assured, we have set up a sentry post, but not in this sheep's gut path, but on the cliff above us.

Once an enemy comes to attack, as long as this trail is blocked, it is an excellent game to catch turtles in the urn. ”

"Hey~ Good idea, it's because I'm short-sighted."

Listening to Geng Zhong's words, Zhu Gaoxuan looked up at the sky with only a ray of sunshine, and nodded in a sudden understanding.

If you block the enemy, how can you destroy the enemy?

After the three-mile sheep intestine path, the passage is fast and open, but it also becomes tortuous.

And this twist and turn is made up of some artificially built stone piers, mud and other debris, and it seems that dozens of hundreds of years ago, someone built fortifications on the other side of Helan Mountain.

And the defensive, most likely, is the enemy from the south.

Sure enough, after two miles of progress, the outside suddenly opened up, and there was a low building remains, revealing a corner of green bricks and green tiles, red walls and black pillars in the gradually melting snow.

In the cold wind, it tells the prosperity of the past and the depression of the present.

"There was originally a small city here, which is said to have been left over during the confrontation between the Liao State and the Western Xia during the Northern Song Dynasty, but was destroyed when the Yuan Dynasty swept the world."

Geng Zhong pointed to the ruins in front of him and introduced, and then hurriedly stopped Zhu Gaoxuan, who wanted to come forward, and said.

"It's good that Your Highness is here, and I'm afraid that there will be enemy sentry cavalry reconnaissance going forward."

Hearing Geng Zhong's obstruction, Zhu Gaoxuan paused for a moment and then asked:

"Didn't you say that there was no trace of the Northern Yuan Tartars within thirty miles? Why is there a sentinel here? ”

"Your Highness, this mountain trail is more than thirty miles long, and the lower officials are not lying."

“……”

You have a good point, and I am speechless.

Zhu Gaoxuan did not continue to move forward, but looked at the gentle slopes on both sides and asked, "Is there our warrior guarding here?" ”

"Yes, there are beacons on both sides, once there is an enemy, as long as the beacon is lit, you can give a warning in time, and there is one every ten miles along the way, even if the first layer of beacon tower is attacked, the beacon tower behind can also be found in time to warn."

"Hmm. Let's go to the beacon and have a look. ”

"Your Highness comes with me."

The four of them rode to the right, and the hillside here was gentle, and they could all go up, but they stopped in front of a abruptly raised hill for a mile.