Early the next morning, in addition to the 3,000 soldiers who had to stay behind in Bison City, the remaining 42,000 soldiers and horses were all mobilized. There is still a large desert area to the southwest from Bison City, but eighty miles to the southwest, you can go out of the desert and reach the area of the Yak River.

The Yak River originates in the Purple Mountain in the central part of Tibet, and finally flows into the Jinsha River from northwest to southeast, becoming the main tributary of the Jinsha River. Although the distance from Bison City to the southwest was only eighty miles, this was undoubtedly a huge challenge for the Jiannan army. But fortunately, Yak City is the city of material supply from Yak City, and a fixed road has been formed between Yak City and Bison City because of the long-term supply of materials and personnel, so the direction will not be lost, but the march on the sand is a hundred times more difficult than that from Yazhou to Bison City.

The difficulty of marching on the sand with a large number of supplies and heavy siege equipment can be imagined, the desert dunes in this area are huge, and the soldiers can certainly grit their teeth to climb over them, but the carts and equipment can not climb the loose sand dunes, so they can only detour through them. A small sand dune would have required the army to travel for miles, which seriously slowed down the army's march. At the end of the day, the army traveled only five or six miles, which was slower than the crawling speed of the sand scorpions in the desert.

Wang Yuan was deeply worried, according to this kind of marching speed, it would probably take more than half a month to reach Yak City, plus the nine days from Yazhou to Bison City, it would take twenty-four or five days on the road, which was absolutely impossible. In order to travel lightly, the army carried only a month's worth of grain and grass in addition to the necessary siege equipment and supplies. and Li Mige and Luo Feng agreed to meet in the city of Luqi, and the time was also set at a period of one month. With this momentum, don't you have to be trapped in the middle of the road?

To reach Yak City, you need to take Yak City, and then the army will go south to Lyre City, which will take a few days, and it will be too late. Moreover, in addition to the problem of the supply of the army, Li Mi's army, which arrived at the city first, was likely to be attacked by the defenders of the city. Last year, the 30,000 soldiers and horses who united with the Fu clan to attack Wangzhou were the soldiers and horses who came to self-discipline the city, which shows that the city is an important stronghold for the Tubo State to hoard soldiers and horses to attack Nanzhao and Jiannan at any time, so once Li Mi's soldiers and horses arrive, the Tubo soldiers and horses in the city are likely to strike first.

Faced with this situation, Wang Yuan was worried for a while, and couldn't think of a way. If you travel lightly, you can cross this desert and reach the Yak River in seven or eight days, but it is impossible to leave behind the heavy siege equipment. Without these things, it would be an empty word to attack the Tibetan side city, and the soldiers would not be able to attack the city when they arrived at Yak City. It is impossible to leave behind thousands of carts full of grain, grass and water supplies, that is the life of the army. Root. None of these things that affect the speed of the march can be discarded, which becomes a dilemma.

After a night of anxiety, the Tianming army hit the road again, still moving slowly like a crawling turtle. An army of tens of thousands crawled like a swarm of ants wriggling in the dunes. The sun was scorching in the sky, and the cars on the ground were sinking into the sand from time to time. The soldiers were pushing carts all over their bodies, cursing in their mouths. The animal foamed at the mouth, rolled its eyes, hissed under the whip, and everything fell into a state of confusion, panic and despair.

Wang Yuan frowned, rode to the back of the team, and looked at the vehicles and equipment that had fallen from time to time on the soft sand, feeling restless. A cart loaded with tents beside Wang Yuan sank deep into the sand, and each step required the desperate pull of a dozen soldiers and two horses pulling the cart.

Seeing the marshal riding his horse and standing aside, the soldiers wanted to show more effort in front of Wang Yuan, so more than a dozen soldiers shouted the trumpet and pushed hard together. The whip rained down on the buttocks of the two healthy horses. The horses worked hard, and the soldiers pushed the wooden wheels that had been sold in half by the sand. As soon as I exerted my strength in the two times, I heard a crisp sound of 'click', and the wheels of this big car actually shattered in half. The wheels on one side shattered, and the cart tilted and slid down on the sand, while the wheels on the other side jumped out of the way and rolled a few feet away on the sand. If the soldiers hadn't dodged quickly, they were almost crushed by the cart that slid into the sand.

The soldiers on the cart were dumbfounded one by one, wanting to behave in front of the commander, but they didn't expect to be self-defeating and break the wheels. It's been a long delay. The soldiers stood aside one by one, waiting for the marshal's reprimand. But they found that the marshal did not seem to mean to reprimand them, but jumped off his horse, staring at the territory of the cart with a strange look on his face.

"Oh, I'm so stupid, I didn't even think of this method. Why are you all standing stupid? Don't come to the cart yet? Wang Yuan said loudly with a smile on his face.

"But the marshal, there are no wheel......s," said one of the soldiers, boldly.

Wang Yuan said with a smile: "I don't want you to push the wheels yet, it's better to have no wheels." Come on, work hard. ”

Wang Yuan personally helped the carriage of the cart to push forward hard, and the soldiers around him rushed up to help when they saw this. The soldier who drove the horse swung his whip and whipped the horse's buttocks, and the horse with the big feet nailed to it pulled hard, and saw that the cart slid easily on the sand, leaving two grooves in the sand, but it did not sink into the sand.

"Oops, it seems to be much easier, and it hardly takes any effort to push." The soldiers were stunned.

Wang Yuan laughed and said: "See, the wheels are cumbersome, and you can't walk in the sand at all, so it's better not to have that Raush." See the chassis of this car? The builder of the big car is also unintentionally planted in the willow and willow shade, and the wooden wheels under the car are upturned on both sides, although only four of them are on the ground, but they are enough to make this car slide like a snow sled. Hahaha, sometimes the easiest way to solve a big problem is just something we didn't think of. ”

The soldiers nodded their heads, and the bottom of the cart was smooth, and several wooden wheels with fixed wheels and axles were upturned in an arc, just enough to be used as a place to slide. Gliding on the sand without settling is a good way to do it by accident.

Wang Yuan immediately ordered that all the wheels on the turf of the cart and the bed crossbow Shenwei cannon should be removed, and if there was no arc-shaped turf, the round shield would be nailed under the turf to increase the contact area and facilitate gliding. The army rested on the spot, and the soldiers and craftsmen began to dismantle the wheels and nail the wooden strips and nails the shields. Half a day later, all the vehicles were refitted, and under Wang Yuan's order, all the carts and equipment began to be dragged and slid on the sand, and the speed was amazing, faster than the infantry. Some of the small slopes actually slid up with great effort, which was easy and pleasant.

Wang Yuan sat on the horse and laughed, the marching speed of the army was guaranteed, and if the march was maintained at this speed, it would only take seven or eight days at most to get out of the desert, and the time would be very free. Most importantly, Wang Yuan found a way to transport large heavy loads on the sand. This method can not only be used in the march, but also can be used in the transportation of coarse salt in Bison City, which can greatly improve the transportation capacity and solve the current capacity bottleneck of the Bison City Salt Lake, and the dilemma of a large number of coarse salt accumulating in Bison City.

Gongsun Lan was wearing tight-fitting chain mail, sitting on horseback with a bumpy figure, looking at Wang Yuan's sweaty face, he handed over the scarf and said with a smile: "Wipe the sweat, the dirt on your face, pay attention to the image of your coach." ”

Wang Yuan wiped his face with a gauze towel and said with a smile: "Is my method wonderful?" Having is nothing, and nothing is being. You can't run without wheels, you can't run fast without wheels, you say it's magical. ”

Gongsun Lan was also impressed by Wang Yuan's quick wit, this person's brain turned so fast, no one could think of a way, he just thought of it, his intelligence was superior, this was not blown.

"Alright, alright, it's a brilliant plan, right? What is there and what is not, it is like playing Zen. General Zhao Qing is urging, hurry up. Gongsun Lan said angrily.

After the annoying problem was solved, the speed of the army's march was much faster, and it was more than ten miles a day, basically reaching the speed that Wang Yuan expected. A few days later, he left Bison City for more than 40 miles, which was already the farthest outskirts of Bison City that could be used to reconnoiter the enemy. More than a dozen beacons stood on the sand, which was the early warning system that the Jiannan Army had spent a lot of effort to build. After passing these beacons, it is time to enter the area where the Yak City sentinel activity is frequented.

As the army advanced, the scouts reported more and more discoveries in the surrounding desert. There was even a small group of Tibetan cavalry who had the courage to leave the land for several miles and follow the Jiannan army. Liu Jun led the cavalry to chase and kill, but these guys fled quickly, and several pursuits were fruitless, scolding Liu Jun angrily.

Wang Yuan smiled and comforted Liu Jun and told him not to waste his efforts. These guys love to watch from the sidelines, and it is difficult to catch them in such a place, it is better to be out of sight, and these guys do not dare to harass the army anyway. As for the general's concern that the traces of the army were discovered, it would arouse the vigilance of the defenders of Yak City and that they would be ready to face the battle, Wang Yuan laughed and dismissed it. Wang Yuan didn't plan to hide the whereabouts of the army at all, and he didn't plan to have a surprise siege battle, which couldn't be done at all. The whereabouts of the great army will be known to the enemy. But what if you know? Wang Yuan didn't care that they knew. He even hoped that the whereabouts of the Jiannan Army would be known, because that would allow the Tubo King's Court to transfer troops to the east and relieve the pressure on Gao Xianzhi of the Western Route Army.

Gao Xianzhi marched from the Bolu Kingdom in the south of the Kunlun Mountains, where the plains and Gobi Heights were plains, and the road was smooth. I'm afraid he marched much faster than himself. He has not fought the enemy for half a month on the march, and Gao Xianzhi is afraid that he has already fought hotly.