After lunch, Li Zicheng only rested for a pillar of incense, and the team immediately marched north along Beichuan, about thirty or forty miles, the upper reaches of Beichuan turned to the northwest, and the army continued to the north, but along a tributary of Beichuan, the Baoku River.

The volume of the Baoku River is obviously smaller than that of Beichuan, not only is the river narrower, but even the speed of the water flow is significantly slower, which is more suitable for reverse navigation than Beichuan.

But the Treasure River itself is a collection of multiple rivers, which are basically the east bank of the Treasure River, which happens to block the path of the cavalry.

Although these rivers provided a large amount of fresh water, they were not really good for the army, and they either had to build pontoon bridges or go around to find shallow tidal flats from upstream and cross them directly.

Throughout the afternoon, Liu Yunshui's department set up a total of four pontoon bridges, and the journey was only thirty or forty miles, but after the army crossed the river, these pontoon bridges were not dismantled, but were left for the auxiliary army behind.

However, the cavalry is now prominent in the forefront, not only the auxiliary soldiers are lagging behind, but the Zhou Bin Division, which is regarded by Li Zicheng as the main force of the operation, is now far behind because of the boat driving against the water, and the cavalry is too far behind, and if they rush to the battlefield alone, they will also face many unexpected dangers.

That night, the army camped at the mouth of the Chagan River, a tributary of the Baoku River, which is the confluence of the Baoku River and the Chagan River.

The soldiers were setting up tents, and Liu Yunshui saw that Li Zicheng was facing the water of the Chagan River, thinking that he was worried about crossing the river, "My lord, do you want the brothers to build a pontoon bridge tonight?" ”

"The brothers have traveled more than 100 miles today, although there are war horses, but they are also tired, let them rest first, and then build a pontoon bridge tomorrow morning, the infantry are behind, don't be in a hurry!" Li Zicheng did not retract his gaze, but turned from the Tea Horse River to the highlands on both sides, where there is water and land, and he does not know if he can grow crops.

If it can be developed into arable land, it can be moved into the Han people in the future, and it can be used to engage in agriculture and provide food for the army, and it may become a permanent Han land, if it is not possible to engage in farming, and the people cannot settle here to support themselves, then sooner or later it will become a happy land for nomads.

In order to engage in farming, in addition to the temperature, there must be a certain amount of precipitation, and I don't know what the amount of precipitation here will be, and whether it can carry the minimum rainfall that farming says.

But the army out of the town of Red River, all the way over, almost no pedestrians, want to inquire about the local water situation, but there is no chance, if not along the river, plus the help of the march map, in this mountainous no-man's land, almost lost.

If it weren't for the copper mine, with the current size and strength of the Xining Army, Li Zicheng would definitely not expedition to the Datong River, even if he defeated the cavalry of the Maili cadres, he would have to leave the army to garrison in such a no-man's land in the future, just like the triangle city of that day, it was completely a military city and a lonely city.

Thinking of the Triangle City, Li Zicheng's heart throbbed, he quickly took out the army map from his arms, spread it on the ground, squatted down, and searched for it on the map, which was really not much different from what he thought.

"Yunshui, come and take a look at this marching map!"

Liu Yunshui came over as he said, and squatted down like Li Zicheng, and went through the marching map completely, but he didn't have a clue, he frowned slightly, and said, "Your Excellency, ......"

"Yunshui look at this," Li Zicheng pointed to the location of Triangle City with his hand, "Did you find anything?" ”

"Triangle?" Liu Yunshui's eyes widened, and he was happy, "My lord is saying that the Triangle City and Daban Pass are ...... Let the two places come together......"

"Daban Pass and Triangle City are still a little far away, and I don't know if there is a straight road to pass," Li Zicheng pondered slightly, and said: "If the battle line is advanced to the northwest, such as advancing to the dividing line between Banshan and Datong Mountain, or directly advancing to the line of Kadang Mountain at the southernmost end of Datong Mountain......"

"My subordinates understand," Liu Yunshui measured the march map with his hand, and said happily: "According to the estimation of his subordinates, the distance between Kadang Mountain and the Triangle City is only sixty or seventy miles, even if there is no straight road or avenue, it can be opened up, but it is only ......."

"What is Yunshui worried about? Are you worried that our war will be unfavorable? ”

"There are adults here, but the subordinates are not worried about the war, the key is after the war," Liu Yunshui stared at the marching map tightly, frowning lightly, but his hands were clenched tightly, "The area around Datong Mountain was originally a pasture for the Mongols...... The Mongols are like the grass in this valley, inexhaustible, inexhaustible, if we advance to the line of Kadang Mountain, we will definitely squeeze the Mongol pastures, but I am afraid that after the army retreats to Xining, Meligan will go south again......"

This is indeed a problem, Li Zicheng was originally for the copper mine, but he was only going to advance to the area of Banshankou, and then expand northward, beyond Dabanshan, and connect with Ganzhou.

In this way, the Dadou Bagu Valley will be used as an internal road between Xining and Ganzhou, shortening the distance between the two and controlling Ganzhou.

But thinking of the Triangle City, Li Zicheng immediately changed his original plan, and decided to advance the battle line along Daban Mountain and Datong Mountain to the northwest, at least to reach the line of Kadang Mountain, and in the future, the garrison here can be used as horns with the Triangle City to prevent Mai Li's cadres from going south from both directions.

These two need to face, are Mongolian cavalry, although Bayar belongs to Lin Dan Khan's Chahar Department, but his strength is not strong, twice with the Xining army, the cavalry is only 100 people, Li Zicheng is not worried, but Mai Li cadres, the strength is relatively large, the number of strong men is worth paying attention to.

&nb