Crossing the Dajin Mountain, and then to the north is the boundless grassland, in this boundless and endless grassland, there is a small river that flows east and west, called Sulan River, the legend is that a girl named Sulan is a girl to save the grassland drought, the river incarnated into the river, this river is as quiet as a girl, slender and long, the origin is hundreds of miles, and the whole year is not alarmed.

The Sulan River is about 300 miles away from the border of the Sui Dynasty, the logistics camp of the Shibi Khan is located on the south bank of the Sulan River, this is a vast camp, the big tent stretches for more than ten miles, there are more than 10,000 herdsmen and 15,000 troops, guarding millions of cattle and sheep and countless hay, this is the military food of the Turkic army of 400,000, every day there are special transport soldiers to drive tens of thousands of cattle and sheep to the barracks, the cattle and sheep on the grassland in the south are endless, and there must be a large group of cattle and sheep at a distance of fifty or sixty miles.

But on the seventh day, the army transporting cattle and sheep was attacked by the Sui army.

Su Dingfang led 5,000 cavalry all the way, they relied on hunting Turkic cattle and sheep along the way as supplies, they found the Turkic logistics camp as early as the fifth day, but Su Dingfang was not in a hurry to attack, when he was in Yiwu County, credulity and recklessness left him the most profound lesson in his life, from then on, he did everything before thinking.

He had to find out all the circumstances of the other side's troops, the routes of cattle and sheep, the number and equipment of the herdsmen, how many cattle and sheep there were, how the battalion was stationed, and so on.

It took two days for Su Dingfang to find out the situation of the Turkic army's logistics battalion and formulate a battle plan.

Inside the big tent, Su Dingfang was deploying his battle plan to the five Eagle Yang Lang generals, and he drew a sketch on a large piece of paper.

"This long river is the Sulan River!"

Su Dingfang pointed to a long river with a wooden pole, and drew countless circles on the south side, "This is their camp, more than 3,000 tents, about fifteen miles long, 15,000 troops, divided into two places, one in the west. About 5,000 people, the other in the center, about 10,000 people, the defense is very tight, it is not realistic for us to attack the camp directly, but I have a way. ”

Su Dingfang moved the wooden pole to the south, a long road, and a flock of sheep was drawn at intervals on the road. All the generals laughed. It's quite funny.

Su Dingfang said with a smile: "This is the military ration route for them to go south, bypassing the eastern foothills of Dajin Mountain and passing through Fu Qibo. Straight down to Yanmen City, if it was cavalry, it would take four days to go, but they drove cattle and sheep. The journey was at least six days, that is to say, there were six convoys of rations on the road, each with 10,000 cattle and sheep, 200 shepherds and 500 soldiers, and our first task was to attack the convoys on the road, but in this way, the enemy would certainly increase the number of troops guarding the grain, and accordingly the number of the large battalions would be reduced. This created the conditions for us to attack the battalion. ”

Su Dingfang's gaze fell on General Lang Yao Dingguo, "General Yao, this task of attacking the grain road will be handed over to you, my request is only four words, kill them all!" ”

．．．．．．．．．．

On the grassland to the south from the Sulan River, there is a 'horse road' trampled by hundreds of thousands of war horses leading directly to Yanmen County in the south. Every day, there is a team of grain transport team to drive tens of thousands of cattle and sheep south, from the Sulan River to Dajin Mountain, there are still 300 miles of distance, need to walk for three days, about every 100 miles or so, there is a mighty cattle and sheep team.

It was noon that day. On the grassland, about 240 miles away from the Sulan River, an escort team was stopping to rest and eat. Herds of cattle and sheep were grazing leisurely, while hundreds of soldiers and herdsmen lay on the grassland, some asleep, some looking at the sky boredly, and some gathered together, talking about the eternal topic of men, and from time to time burst into a burst of wild laughter.

The 400,000 troops who went south with Shibi Khan this time were not all Turks, half of them were all Tiele tribes, Hui, Sijie, Tongluo, Bayegu and other nine Tiele tribes, about 200,000 troops for Shibi Khan, and the 15,000 troops responsible for guarding logistics were soldiers sent by Baye Gubu, living in the area of the Odun River, and their equipment was still the same as before, and even the Turks only had the same equipment as the Sui army of Shibi Khan's 100,000 guards.

This is the depths of the grassland, their enemy is only the steppe wolf, the soldiers of the ancient tribe of Baye did not have any vigilance, at this time, a row of small black dots appeared on the grass knoll in the distance, they rushed down the grass knoll, and pounced on this side, the grass knoll kept pouring out a large group of black spots, it was a thousand whole cavalry.

The fierce sound of horses' hooves alarmed the soldiers lying on the grass, and many of them jumped up to look into the distance, and in a moment they began to shout, and the cavalry mounted their horses and hastily responded to the battle, while more than 200 herdsmen fled eastward with their cattle and sheep.

A thousand Sui cavalry roared, dense arrows shot at the ancient soldiers, the enemy soldiers screamed and fell off their horses, the two armies instantly collided together, fought fiercely on the grassland, dozens of Sui troops chased the herdsmen, although the herdsmen also had knives, but they were far from being able to defeat the well-armed Sui army, in a moment, dozens of herdsmen were killed, the screams rang out, and the rest of the herdsmen were frightened to scatter, leaving their cattle and sheep, desperately beating horses and fleeing to the east.

The Sui army did not chase either, and began to slaughter cattle and sheep, blood stained the grass red, and in less than a quarter of an hour, five hundred Baye ancient soldiers began to be unable to support it, and quickly collapsed, they fled from the battlefield and fled to the northeast, and the Sui army pursued and killed all the way, chasing more than ten miles, and killing three hundred people.

When the fire of burning corpses was raging, Lang gave an order to Yao Dingguo, and the Sui soldiers turned their horses and headed south, chasing another target.

In one day and one night, two grain delivery teams were slaughtered, which meant that the 400,000 troops in the south would be without food for two days, and the logistics army realized that something was wrong, so they sent a grain guard team of 3,000 people to the south to protect the other four grain teams, and at the same time changed the grain delivery plan, increasing the escort army to 3,000 people, and increasing the number of cattle and sheep to 200,000 heads at a time, which is three days' food.

The army of the large battalion began to decrease rapidly, and Su Dingfang's army lurked like a pack of steppe wolves at this time, patiently waiting for the opportunity, and on the third day, another team of 3,000 people escorted 200,000 cattle and sheep to set off, which reduced the number of troops in the large camp to 4,000 people, and the opportunity finally came.

At night, Su Dingfang led four thousand cavalry to wait ten miles east of the camp, the cold moonlight shone on the four thousand cavalry, adding a killing atmosphere, Su Dingfang silver helmet and iron armor, holding a gold-backed tiger tooth knife, located at the front of the team, the horizontal knife immediately, indifferently waiting for the situation in the barracks.

Due to the continuous occurrence of the Sui army's attack on the grain transport team, the chief general in charge of logistics security, Baye Gubu Ye Husu Cao sent people to Yanmen County to report to Shibi Khan, but also strengthened the control of the camp, compressing the original sixteen miles long camp to ten miles, so that it was convenient for the army to patrol, every night, five hundred patrol teams patrolled back and forth in the camp to prevent the Sui army from night attacks, even so, the huge team of millions of livestock still made it difficult for them to cover everything.

At the first watch, the western camp suddenly broke out into a shout, and then the fire rushed to kill, a thousand Sui cavalry killed into the camp, they killed every person, set fire to the tent, a wail and scream, the cattle and sheep in the large circle were frightened, scattered and fled.

Baya Gubu Yehu Sufu urgently led 4,000 cavalry to meet the battle, and they galloped westward, while the frightened herdsmen fled eastward.

At this time, on the grassland ten miles to the east, Su Dingfang saw the fire from a distance, he waved his sword, pointed at the camp, and coldly ordered: "Kill me!" Neither men, women, nor children, but not a single one remains. ”

Four thousand cavalry suddenly launched and rushed towards the Turkic camp, and in a moment, the Sui cavalry slaughtered into the eastern camp, killing the Turkic herdsmen's heads, bleeding like a river, torches lit the tents, and the soaring flames soared into the sky, reflecting the night sky on the steppe......

In August of the 11th year of the Great Cause, 5,000 cavalry of the Sui army, under the leadership of the general Su Dingfang, attacked the Turkic logistics center at night, killing tens of thousands of enemies, and millions of livestock were poisoned and killed by the Sui army's poisonous forage in two days, completely destroying the logistics center of the 400,000 army.

．．．．．．．．．．

Xicheng Pass is known as the head of the nine stops, Xiongguan is close to the mountain, high on the hook mountain, a husband is the pass, ten thousand people are not open, at this time, the West Pass has been occupied by the Turks, stationed an army of 1,000 people, controlling the throat of Mayi County to Yanmen County.

The night shrouds the West Pass, the sky is gloomy, the moon hides in the dark clouds, so that the night of the West Pass becomes extraordinarily dark, at the time of the third watch, the city gate has already been closed, on the head of the city, more than a dozen Turkic sentries are patrolling back and forth, watching the movement outside the pass.

But behind the Xicheng Pass, a Sui army scout team of more than 800 people has quietly approached, they are under the leadership of Lang General Wu Zhiyuan, desperate, they come to the road on a section of the cliff is particularly dangerous, can only go down, but can not go up, if they can not capture the Xicheng Pass, they will also be difficult to escape, will be annihilated.

But the Turkic army never dreamed that the Sui army scouts would appear behind them, but on the city tower behind the Xicheng Pass, there were still two Turkic sentinels, patrolling back and forth on the city.

Wu Zhiyuan and a few scouts slowly approached, they observed for a moment, confirmed that there were only two sentries, Wu Zhiyuan gave another sharpshooter scout a look, the two took off the crossbow from their backs, each put a crossbow coated with Papamu poison into the arrow trough, and raised the crossbow together to aim at the two sentries.

'Click! Click! Two soft sounds, crossbow arrows shot out like lightning, two sentries snorted, clutched their throats and planted from the city one after another, several Sui soldiers quickly rushed up, using a flying rope to climb up to the city like an ape, only a moment, the city gate slowly opened.

Wu Zhiyuan was overjoyed, and with a wave of his hand, eight hundred Sui army scouts quickly rushed into Xicheng Pass.....

The Sui army successfully attacked Xicheng Pass at night, and most of the more than 1,000 Turkic defenders were killed in their sleep.

The unexpected loss of the Western Pass severed the connection between the two Turkic armies of Kwantung and Kwanti, and what was more serious was that the 100,000 Turkic army that was facing the confrontation with the Fengzhou Army was facing the crisis of cutting off food supplies.