"Lord, this is a letter sent by Lord Taifu urgently, please read it carefully."

Wang Yi took out the handwritten letter from his bosom that was forwarded by Liu Wenjing in Luzhou, and presented it to Yang Er.

Yang Er hurriedly took it, opened it and took a look, and then burst out laughing.

"This Li Yuan originally imitated the law of this king to occupy his long-term rule and forcibly occupy the rich land of the Hetao, hehe! Well calculated. ”

"Abacus? What is the abacus? ”

"Oh! It means to be calculating. Yang Er suddenly came to his senses, and at this time, there was no such thing as an abacus in the world.

Suddenly, Yang Er thought about letting go of Li Yuan, let go of other calculations, and thought of the originator of this computer, "Abacus". Since you have a lot of time now, why not make an abacus to teach Wang Dai and the dust? Xiao Yi and Hualong can learn together, but they will plan to do it.

"Lord, lord!" Wang Yi suddenly felt that Yang Er was stunned and didn't make a sound or read the letter, and was shocked that something was wrong, so he hurriedly called a few times.

"Oh! Lord Wang, the king suddenly remembered something, so he lost his mind. Taifu has already made the reason for the matter clear in the letter, and his father also asked the king to let go and force Li Yuan to withdraw his troops from Hetao, which requires this king to think about it, you should retreat first! ”

"Yes, my lord." Wang Yi agreed, turned and left.

Taking advantage of the absence of Wang Dai and the second daughter of Chuchen, Yang Er asked Abeyi to find a pen and paper to draw the drawings of the abacus on the table. It didn't take long to draw the shape of the abacus, and by the way, he also drew an exploded view of the main parts, and after marking the corresponding size, he called Hualong and handed him the drawings to ask him to find a carpenter on the street to make them. This thing was as easy to make as a child for the carpenters of the Great Sui Dynasty.

has not been able to get the result of Wu Yunzhao's raid on the Turkic tooth tent, which made Yang Er unable to calm down for anything, and wanted to find Sister Dai and talk to Chuchen, but the two sisters went to the street, bored, Yang Er decided to go to the street to find these two women, so he took Abeiyi and Zhong Jian out of the Beiping Mansion for the first time. It's not that Yang Er doesn't like to walk around, it's just that he usually has too many things to worry about and has no intention of going out. In addition, the situation on the street in this ancient era is completely different from the prosperity of later generations, but the street is full of beggars and homeless children, which is easy to make Yang Er bored from his heart, so he has never had the hobby of wandering on the street.

The sun overhead is still hot, and the late summer sun can roast people who have been outdoors for a long time. barely walking on the streets, I don't know where the second daughter will go.

"Xiao Yi, where do you sisters usually like to spend time on the street?" Yang Er took the folding fan in his hand to cover the dazzling sunlight and asked Abey, who was accompanying him.

"Does that need to be said? You must go to the rouge gouache shop, or you can choose the best fabric at the silk shop. Abeyi whispered, seemingly sure of his own judgment.

"Okay, you lead the way, let's go find them and see what good things they bought."

Abeyi led the way in front with a silk bamboo umbrella, followed by Yang Er and Zhong Jian, and the group walked slowly among them. This Zhuojun city is also prosperous, worthy of being the capital of Yanyun and a big town in the north. There were all kinds of people in the market, and the shouts came and went. There are all kinds of dealers who buy, and there are many barterers among them, and what Yang Er sees the most is that some foreign merchants are exchanging grain with local merchants with truckloads of cattle and sheepskins.

Seeing Yang Er stop and watch these people's transactions, listening to these people's bargaining, there was suddenly a strange thought in his heart, but it was not clear yet.

"Brother Shi, do you think it's weird that they didn't trade money for money? These surrounding alien races are all nomads on the grassland, and they lack silver money in their hands, of course, it is useless for them to hold silver money on the grassland, so they generally use barter to trade, and it is very inconvenient to carry silver money on their bodies. These foreign traders were here to exchange grain for sale to the grasslands, and in exchange for more furs from the herdsmen's hands, the difference in price was enough for these merchants to earn. Zhong Jian whispered to Yang Er's side to explain to him. In fact, Yang Er has long been clear about this, and even the knowledge of financial theory in this area is far beyond that of people of this era. Vaguely, Yang Er seemed to have a vague idea of training Li Yuan.

After listening to Zhong Jian's words, Yang Er nodded lightly, and continued to follow Abeiyi to find Wang Dai and Chuchen thoughtfully, but his thoughts on this way were no longer on the second daughter.

In the depths of the vast desert grassland, Wu Yunzhao's White Horse Battalion has been here in Helan for 5 days, and there is no shelter on the grassland, and the nearly 20,000 troops have had a particularly hard time. In addition to the horses that were released, both the generals and soldiers hid in the round tents of the captured Turkic herdsmen to escape the heat. Fortunately, there is a meandering river next to this tribe, and the river is clear, but there is no shortage of water. Once the sun set, thousands of sergeants took off their clothes and soaked in the river to cool off, laughing and laughing! It's not hard to pass the time.

"General, the beacon smoke in the distance is lit, and the Turkic brigade is coming here, and there are still about 200 miles from here, and the scouts sent out have also returned one after another." Zuo Tiancheng rushed into Wu Yunzhao's Chinese army tent to report, with a nervous face.

"Good! Our army's purpose has been achieved, and the whole army set out for camp at three o'clock tonight, and ordered to go down to have dinner earlier, bring more water after eating and drinking, catch up with the cattle and sheep, and load all the cattle and sheep skins and furs captured along the way on the wagon. ”

"Yes, General." The generals in the tent finally waited for the order to return to the Central Plains, and they were all very excited.

At night, a full moon hangs in the sky, illuminating the grassland as if it were day. There are only the sounds of various insects singing one after another, as if they are bidding farewell to the departing army. It's just that this crowd is particularly huge, several times more than when they came, with more cattle, sheep and horses, and thousands more ox carts and carriages. At this time, the officers and soldiers of the Baimayi battalion were completely like transport troops, and the queue of a large army was more than ten miles away.

"General, the subordinate doesn't think it's appropriate to march like this." Ling Jing said to Wu Yunzhao, who was commanding the march of the army.

"What's wrong, sir?"

"The general's march in such a long queue is too slow, and the men and horses are too scattered to be vulnerable to sudden attacks, and it is necessary to concentrate at least 5,000 men and horses in front in case the Turkic troops rush in. We should also immediately send a horse to the direction of Yinshan to spy on the situation, and contact General Luo Cheng of Yanshan to come over to meet our army. ”

"Hmmm! Just Mr. Yi. General Zuo ordered you to take a team of scouts and horses to wait for ten miles to patrol along the way, and if anyone intercepted my way back came to report to me immediately. Contact Luo Chengbu as soon as possible and ask him to send troops to respond. ”

"Order." Zuo Tiancheng accepted the order, and immediately rushed to the front of the queue with dozens of his guards.

"General Laihu'er, lead 5,000 men and horses of the Chinese army to the front of the queue to open the way, and keep a distance of 2 miles from the brigade so that our brigade can meet you at any time."

"Order, General." Laihu'er hurriedly selected 5 flag officers and 1,000 of his subordinates from the brigade, a total of 5,000 elites rushed to the front of the queue and was responsible for opening the way.

The army was silent in the night, no one spoke, and everything seemed so peaceful in the moonlight.

At this time, tens of thousands of Turkic troops, who were less than 200 miles away from the Helan tribe, had already learned the news of Wu Yunzhao's transfer overnight, and they also changed their route to find a shortcut to chase them all the way.

"General Takhan, don't chase too closely, wait for the arrival of the Great Khan's army. A few days ago, Prince Jieli wrote to say that he had joined Li Yuan's generals and was heading to the foot of Yin Mountain to intercept them, and this stubborn bandit of the Sui army could not escape. "Following the Takhan Tiger Division to return first to rescue Hal and Lynga Tent, the military division Dalit caught up with the Takhan pro-army horse team and said to the Tiger Division general Takhan.

"Even if this is the case, my brigade can't stop, and we should chase a little more when the night is cool, and rest in camp after dawn to avoid the sun. The order went down, so that the soldiers cheered up, and there was time to rest during the day. Ignoring Dutley's words, Takhan ordered the army to continue the pursuit. Less than 200 miles behind them was Shabalio Khan's brigade.

Relatively speaking, the speed of the Turkic pursuers was much faster than that of Wu Yunzhao's army, and the speed of the march was delayed because Bai Mayi carried too many captured materials from the battalion. Fortunately, the two are about 200 miles apart. Wu Yunzhao's White Horse Yicong took at least 6 days at this speed to reach the trail at the foot of Yin Mountain and enter the mountain pass.

It's just that what Wu Yunzhao didn't expect was that the Turkic army not only sent an interception force, but this force turned out to be 20,000 Turkic elite eagle division troops, and 10,000 Li Yuan Tang Army cavalry, a total of 30,000 elites have rushed to the foot of Yin Mountain.

"Little prince Jieli, our army can seize the Yinshan mountain entry road in half a day, and defending the Ural Pass in the mountains will cut off the Sui army's way home." The deputy general deployed by the Jieli Eagle Division, Aga said to Jieli.

"Okay, inform General Yin Kaishan of the Tang Army that he will camp here today, and tomorrow he will attack together to occupy the Ural Pass." Jieli ordered.

The two armies were camped down on one side of the hill, and the sun was already setting in the west.

"Little prince Jieli, the end will be polite." When Jieli was negotiating with several lieutenant generals in the tent, Yin Kaishan, the general of the Tang Army, brought two of his generals into the account to meet.

"Oh! General Yin invited. Jieli politely got up and saluted back, and invited Yin Kaishan and the three of them to sit on the round cushion in the guest seat on the right and talk.

"Lord Wang, our army has found out that there is a Sui army stationed at the mountain pass at the foot of Nayin Mountain, and it is the army of Yanshan Luoyi from the military uniform and banner." Yin Kaishan said.

"Hmmm! This prince already knows about this, but there are more than 10,000 people, tomorrow you and I will suddenly attack, just disperse him with one heart, and my Turkic cavalry has not encountered an opponent in this steppe. Jieli said to Yin Kaishan and the others very casually, and several generals under Jieli in the tent also laughed out loud when they heard it, and they didn't take this Yan army from afar in their eyes at all.

"Lord Wang, my Jinyang Tang Army and the army of the King of Hedong Jin have always had grievances, and the last general will ask for battle, and tomorrow the sun will rise to take the lead, kill this Yan army, and cut off the Jin army."

"That's it! This merit of grabbing the camp was given to the general, and our department watched the enemy formation for the general in the back. ”

"In this case, the last general will return to the camp and prepare, so as not to disturb the prince's rest." After that, Yin Kaishan and the two generals behind him got up and saluted and said goodbye. Jieli took his subordinates to send Yin Kaishan and others to the outside of the account, and watched these people go away, with a sly smile on his face.

"General, why did you let him fight this battle? Put this merit to others. Adjutant General Subashi asked puzzled.

"Humph! Yan Jun's reality is unknown, and it is not an exaggeration to let him touch the truth and reality, we are waiting to stop Wu Yunzhao's White Horse Brigade is a great achievement, why fight for the length of the moment? Jieli said coldly.

"Shogun Takami! Hehe! The generals behind him laughed softly.

The news of the arrival of the Turkic army had already been discovered by Luo Cheng, and the morale of the soldiers in the Yan army began to become unstable, and there were many people who were afraid of war. If it weren't for Luo Cheng and the others, maybe this group of Yan troops would have fled into the mountains from the path to dodge. This situation made Luo Cheng extremely angry, if it weren't for Zhang Gongjin and other generals to persuade him, Luo Cheng might have killed a few people to establish his authority.

"Shaobao, at present, the Turkic army is large, and it is normal for the army's morale to fluctuate slightly, and it is normal to think about the battle of tomorrow." Zhang Gongjin persuaded this Luo Chengdao, he knew in his heart that the Yan army had not fought for many years, the soldiers lacked training, the morale was originally insufficient, the Turkic cavalry was originally extremely good at fighting, and it was normal for soldiers to be timid.

"General Zhang can select 3,000 archers from the army to go out of the camp tomorrow to line up, and see how many generals this son will kill him tomorrow to boost the morale of our army." Luo Cheng had participated in the battle for Wagang Mountain and saw the power of bows and arrows, so the first thing he thought of was to use bows and arrows to restrain the charging of the Turkic cavalry.

"What Shao Bao said is that the last general will go and prepare." Zhang Gongjin took Wei Chi Nan and other generals to immediately go out of the camp to select archers.

Luo Cheng saw that there was no one in the tent, so he walked out of the tent, looked at the starry sky and silently recited: "Success or failure is in this move!" I hope that tomorrow I can kill a few Turkic generals, so as to show my Luo family's ability. I hope General Wu Yunzhao will return as soon as possible! ”

At this time, Wu Yunzhao's army, which was far away in the depths of the desert, was still 3 days away from the mountain pass.

"General, the chasing army behind me is only 60 miles away from me, and if I go on like this, I will be caught up." Ling Jing caught up with Wu Yunzhao and said anxiously, not bothering to wipe the sweat from his head. 60 miles on the grassland, that is, half a day's horse, will be overtaken.

"Sir, don't worry, you go first, and Rong will break the back for you." There was no trace of panic on Wu Yunzhao's face, unlike Ling Jing, who had never gone into battle to kill an enemy. The hundreds of soldiers behind him were also fearless, all of them had seen a big battle, and each of them had the pleasure of wanting to fight.

"Come to General Hu'er, your front army of 5,000 people will stay, and you will protect Mr. Ling first, this general has promised the lord that Mr. Baoling is worry-free."

"General, the last general will accompany you to break off, and Mr. Ling has his own lieutenant general to protect him."

"It's good! You and I have fought Tuyuhun together, and today we will join hands to fight the Turks again, hehe! Wu Yunzhao said proudly, and Laihu'er laughed when he heard it.

Wu Yun summoned Ling Jing to go far with the brigade, so he chose a gentle slope with Laihu'er, and arranged 5,000 white horses from the elite to go uphill and set down an arrow array to wait for the Turkic follower army to arrive.

Outside the Yinshan Pass, the battle between the Yan army and the Tang army Yin Kaishan has begun.