Wang Siyu took the wooden pole, walked quickly to the sand table, pointed to Xingxingxia and said: "The intention of the Hui people to occupy Xingxingxia is obvious, that is, they want to block us in the west of the river, and they can't stab him in the back, Jiegangas's idea is good, but he forgot one thing, the two castles of Baiyun Fort and Minghui Fort were built by us, and no one knows the weaknesses of the castle structure better than us, as long as the gunpowder is placed on the weak point of the castle, I have estimated that thirty catties is enough to blow them up, but I also know, I'm afraid the governor doesn't want to do that for the time being. ”

"Go on!" Zhang Huan was already full of interest, and the last sentence was what he cared about.

"Jiegangas wants to block us in the west of the river with two castles, he just set up a trap for himself, then we waited patiently, so he always thought that we could not rush out of the west of the river, and we went out easily, so that the initiative was in our hands, not only that, but he also created a plank road for us to repair the plank road in the open and the plan to secretly Chen Cang. ^^^^”

Speaking of this, Wang Siyu took a deep breath and pointed the wooden pole to the south of Dunhuang, "From Puchanghai (now Lop Nur) to the south along the end of the river, seize the town of Boxian, so that we will be inserted behind the Tubo people, do you understand what I mean?" ”

Zhang Huan stroked his palms and laughed, Wang Siyu really coincided with him, he breathed a sigh of relief, and said with relief: "You have made great progress now, and you have changed from general to handsome, but there is one thing I want to remind you, you must not underestimate the enemy, you obviously underestimated Jiegangas, do you think he can't think of Pu Changhai's road?" I'm sure that his intention to occupy Xingxing Gorge is not just to block us from going west, he just wants us to plug in behind the Tibetans

Wang Siyu was solemn, "The subordinates have remembered the teachings of the governor." ==”

"Although this is what Jiegangas thinks, it is also good for us."

Zhang Huan pondered for a while, and then solemnly said to Wang Siyu: "I have great expectations for you. If I can take Anxi this time, I plan that you will be the governor of Anxi and Beiting, so you have to work a little harder in this battle of Anxi, do you understand? ”

Wang Siyu nodded silently. He understood what Zhang Huan meant, that is, he wanted him to lead the army south to Boxian Town, and he bowed down and responded: "My subordinates understand!" ”

"It's good that you understand. ^^^^ going south this time. I want you to do one thing for me. ”

Zhang Huan walked to the tent with his hands behind his back, he stared at the blood-red sunset in the distance that had already stained the western sky, and his tone was a little sad. He said slowly: "You have to bring back to Hexi safely the soldiers who have been alone in Anxi for twenty years for my Tang Dynasty, you have to remember, this is your real task." ”

That night, Wang Siyu led 20,000 cavalry and tens of thousands of horses to leave Xingxing Gorge and head towards Dunhuang County. At the same time, the Tang Dynasty sent Shen Fang, the middle of the imperial history, as the envoy to Tubo, and Han Chaocai, the imperial servant of the temple, as the envoy to Hui, to go to the two countries to formally negotiate and ask them to withdraw from the Western Regions of the Tang Dynasty. ^^^^

In mid-June, the Huiqian army arrived at Yanqi Town, and at the same time 20,000 Tibetan reinforcements also arrived at Yanqi Town. A fierce battle broke out between the two armies over the town. The Hui general Meng Lianda was defeated, but he killed a horse pistol. The Tubo army that had just relaxed was defeated, the Tubo army retreated to Qiuzi, and Hui Hui occupied Yanqi in one fell swoop, Jiegan Jiasi changed the previous style of taking advantage of the victory to pursue the ground, ordered the army to be stationed in Yanqi Town, began to repair the city wall, collect cattle and sheep, and at the same time sent troops to garrison Tiemen Pass, Zhang Sancheng to guard and capture, Yushu to guard and capture and other castle passes, and carry out a steady and steady encroachment war.

On June 20, Zhang Huan received the news of the Yanqi War, and he immediately realized that the opportunity he had been waiting for for had finally arrived. ****

It was a moonless night, and the clouds hung low, and the darkness pressed down on the mountains, and the high, dark mountains looked like hideous-looking trolls, and the night had completely swallowed them up.

Minghui Fort is like a giant ground with one foot, close to the mountain and built, and Baiyun Fort, it is strong and tall, and easy to defend and difficult to attack, compared with the other two castles, it is more than a husband and a pass, ten thousand people can not open the momentum, it is built on a protruding mountain beam, it is this more than ten zhang high mountain beam will be Xingxing Gorge crossed, like a dam, the infantry can be bare hands to over, but the cavalry and baggage can not pass, can only pass through the castle. In the night, the ground could not store heat, and the sultry heat of the day had been driven away by a cool breeze, very cool, at this moment, the brigade of Tang troops was already lurking three miles east of the castle, waiting for news from the special service battalion, Zhang Huan stood on a big rock, staring deeply at the dark fortress in the distance. ^^

As Wang Siyu said, Minghui Fort and Baiyun Fort do have structural defects, not that the city gate does not have a moat, but the castle is built by the mountain, there is no city wall on the side of the mountain, the long and short stone strips are close to the mountain, it seems uneven, there are gaps one after another, the largest gap can even drill into a person, this structural defect makes a section of the city wall behind the mountain like building blocks, without support, only a battering ram can easily collapse the city wall.

This structural defect is not that the Tang army does not want to make up for it, but the castle has just been repaired for only two months, but this method of attacking the defect may not be possible even if you understand the people of this castle, and there is a steep slope below that section of the city wall, not to mention the battering rams, even the soldiers have nowhere to focus on carrying the crashing wood. ^^^^

The Hui people can't do it, but the Tang Army, to be exact, the Xiliang Army, they are different, because they have a unique weapon.

Carrying out secret missions is naturally the special service battalion in the flying ape team, they are not many in number, less than 100 people, but all of them have the stunt of flying eaves and walking on the wall, in the rugged Xingxing Gorge, they walk as fast as flying, like walking on the ground, but there are only three people who carry out the specific task, and they are carefully selected from the hundred, not only more agile, but also bold and careful. \\

At this moment, the three of them are less than two hundred steps away from Minghui Fort, they are wearing black night clothes, each carrying a flat thin iron box, each box contains 20 catties of gunpowder, after three years of research and experiments, the development of gunpowder by the Xiliang Army is also getting deeper and deeper, not only the proportion of nitrate in gunpowder has been increased from the original sixty percent to seventy percent two, increasing the explosive power, and mastering a more refined grinding method, so that the gunpowder particles are as small as corn, and full and smooth, just because it depends on manual grinding, so the output has never been up.

The three of them ran like cunning rabbits, sometimes hiding behind the boulder, sometimes crouching and hurrying, and under the cover of the dark night, the three of them finally reached a boulder about fifty paces away from the stone fort, and there were patrolmen in the city who kept walking back and forth, watching the movement under the city, and there were several special wells dug in the city, and there were new cylinders in them, and the cylinders were covered with a piece of cowhide, so that the actions of the sergeants within two miles of the castle could be heard clearly. \

Further on, the three of them were about to be exposed to the sight of the patrolmen, they had already planned, as soon as they jumped, the three of them climbed up the stone wall one after another, and climbed towards the city wall little by little under the cover of the lush vines on the stone wall.

Fifty paces, they climbed for a quarter of an hour, and were less than a foot from the wall, and with a kick of their feet on the stone nest, they landed lightly under the wall, like three apes, silently and silently, clinging to the wall.

At this time, one of the patrolmen in the city was dazzled, he seemed to see something on the stone wall, he rubbed his eyes, only to see a few vines on the stone wall shaking, there was nothing abnormal, he looked down again, still did not see anything. ****

Maybe the night snake is out of the hole. He muttered, and turned to walk in the other direction.

Three Tang soldiers drilled out of the gap between the city wall and the stone wall, and according to the instructions of the craftsmen who built the city wall, they found the place where the gunpowder was placed, which was a large bluestone loose at the base of the wall.

One, two, three! The three of them whispered and shouted together, and with a slight sliding sound, the bluestone was pushed to a depth of one foot, and the three of them immediately hid again, and after half a moment, seeing that there was no movement in the city, the three of them came to the bluestone again, and pressed their feet against the bluestone together, one, two, three! The three of them worked together again, and Bluestone was finally pushed into the wall, revealing a square hole one foot high, three feet long, and five feet deep, enough to hold the powder box on their bodies.

The three of them embedded the gunpowder box in the hole, and calculated it very accurately, the height of the three gunpowder stacked together was exactly one foot, and one of the thin Tang Jun took out a rope and carefully tied the three leads together, confirming that it was correct, the three of them looked at each other, nodded, and the thin and tall Tang Jun felt out the flint and fire sickle again, click! Click! After two blows, a flame appeared in his hand.

In the dark night, this fire was extremely dazzling, and the patrol soldiers in the city immediately discovered it, "Who! With a shout, the alarm bell rang! While! While! The earth rang, and countless footsteps began to rush up to the city.

Under the city, the three of them had already run out for nearly a hundred steps, and they ran desperately, as if they were racing against time, and the lead in the square hole was burning wildly, writhing with red flames, and they were less than half a foot away from the tin box.

The three of them had already run a hundred and fifty paces, and the sound of arrows broke through the air, and hundreds of arrows were fired at them from behind, although they could no longer reach them, but the three of them still ran as if they were fleeing from the realm of death.

At this moment, there was a sudden low muffled sound behind them, followed by an earth-shattering explosion, deafening, a red light burst out under the city walls, and then the fire rushed up to the city, black smoke rose into the air, forming a huge mushroom cloud, the earth was trembling, the rubble was flying, and the three of them were already unsteady on their feet, and they threw themselves into the low-lying place together, holding their heads tightly.

After the mushroom cloud dispersed, another sound was soon heard, as if it was the sound of a landslide, and with a loud bang, a section of the city wall about 100 zhang wide in the southeast collapsed, stirring up dust in the sky, and more than 100 Hui soldiers were buried alive in the collapsed city wall screaming.

"Kill!" Suddenly, there was a sky-shattering shout of killing in the distance.