On the third day, the army reached the upper reaches of the Khubi Gonsi River, but Bailiyan did not cross the river, but continued north along the west bank, and arrived at the Delangi Pass in the valley of the two rivers two days later.

To the west of the Drangi is the lower reaches of the Yass Ai Falls River, and to the east is the upper reaches of the Khubi Gonsi River, and the two rivers are sixty miles apart from east to west in the Drangi section.

Because it is located in the lower plain of Yassai Waterfall, there is an east-west direction next to the Yasruili Waterfall River Plain, about 45 miles long and undulating mountains, and there are five towering peaks in the mountains, which are shaped like the surface of human feet and toes, so this mountainous area is named Delangi.

Fourteen miles away from the upper reaches of the West River, there is a river beach forest between the Derangi Mountain and the West River, so it is named the Delangi Pass, and if you want to pass through the Derangi, you can only pass through it.

Bailiyan climbed the nearby hill and looked north of Delangi, and said to Sikong Nan beside him:

"Brother Sikong, if this place can be used by our army and connect to the West Mountain of Khubigong, it will be extremely beneficial to our army."

"Does the general want to entrench himself here?"

"Brother Sikong, you see, there is the Yassai Waterfall River in the west of the Delangi Plain, the side of the river is steep and insurmountable, and the east is the West River, and only the fourteen or fifteen miles of forests and tidal flats can be allowed to pass through.

"But the terrain to the north is still unclear, and if the Jinxuedi people build bridges from two rivers and cross the river from different places at the same time, our army will be attacked on their backs."

"I see that the two sides of the lower reaches of the Yasai River are quite high, and it is not conducive to erecting pontoon bridges here, only the west river on the east side can be erected pontoon bridges. If the terrain to the north is favorable, it may not be impossible to entrench here. ”

"Even so, with the current state of our army, the terrain to the north is unknown, there is still a gap of more than ten miles in the Delangi Mountain, and at the same time, we have to deal with the enemy crossing the river in the west river, and our army will not be able to divide the troops. There are still 130 or 40 miles away from the West Mountain of Cupy Gongxi, and the battle line is too long, which is extremely unfavorable to our army, and it is still too early to occupy this place. ”

"Yes, but if there is any way, it would be good to stabilize the situation first."

There were more than 2,670,000 people in Bailiyan's army, of which 30 or 40 percent were women and children, as well as horses, unicorns, and a large number of baggage, plus 40,000 people, that is, more than 300,000 people, and there was no problem in guarding the gap between the West River and the Delangi Mountain.

How can it be that among the 300,000 people, 100,000 are capable of fighting, and the other more than 100,000 young adults and women are untrained and useless, and the Central Plains thieves lurking in the new vassals are a hidden danger, which is not conducive to a long-term war. It will be very difficult for 100,000 people to defend the mountain pass for more than 10 miles and the river beach for more than 20 miles.

While Bailiyan was thinking, the scout who went north to explore the way rode back to the camp:

"Enlighten the generals, my subordinates have reached out twenty-five miles to the north and found a large swamp."

Bai Liyan heard the news and hurriedly asked:

"Swamp geometry?"

"Three miles to the north is full of swamps, and there is no end to it, and when the subordinates return, they have reached out thirty miles to the east and west, and they are still swamps, and I don't know whether all of them are swamps for more than sixty miles from east to west."

After questioning the scouts, Bailiyan took out his binoculars and looked at both sides of the West River. The two banks of the West River are mostly tidal flats, the forests are all over, the width of the river is different, there are many places that can build bridges, Jin Xuedi people can erect more than a dozen or even more than 20 pontoon bridges at the same time within more than 20 miles, it will be very difficult to destroy all the bridges with impact.

Although the northern swamp can be filled, it is not possible to fill in the flat land through which hundreds of thousands of people pass in a short period of time. Therefore, the main threat in the short term comes from the West River to the east. Thinking of this, Bai Liyan was in a dilemma, and then Jiang Jie said:

"My lord, my subordinates have a plan that may be available."

"Oh, let's hear it."

"One hundred and thirty or forty miles down the river here is outside the West Mountain, where the Jin Xuedi people and navy are entrenched, why don't our army seize their warships and take them for themselves, and raise a sailor division by themselves."

"Self-funded?" Bai Liyan's eyes lit up, and she hurriedly asked: "How to raise your own money?" ”

"My lord, you think, one hundred and thirty or forty miles north of our army is the Jin Xuedi people blocking the camp outside the West Mountain, there are so many people in our army, even if we want to join forces with Mr. Su to enter the valley, I am afraid that it will be difficult to enter the valley without killing or injuring thirty or fifty thousand people, and if the defenders of Calezer counterattack and cross the river at this time, and the 400,000 barbarian recruits are closely following, our army will be difficult to parry.

Since the adults want to run this place, and they don't want the Jin Xuedi people to build a bridge over the West River, they can only use the sailors to balance the two banks, and at the same time use the waterway as a link, and use boats and boats to carry people and baggage back and forth between the two places, so wouldn't it be happy! ”

"It makes sense, what Jiang Jie said is reasonable." Sikong Nan agreed, and then said: "This method was used in the year when our cavalry and navy marched hand in hand, attacking and disturbing the grain road of the Black Turban Army, which had the same effect. General, you might as well give this plan a try. ”

"Well, it's doable!" Bai Liyan affirmed, and continued: "There are still seventy or eighty large and small warships on the river, and the oarsmen of the Central Plains people in each warship are as little as thirty or forty, and as many as fifty or sixty, with a total of three or four thousand people. ”

Although the oarsmen of the Jin Xuedi warship are all from the second, third and fourth generations of the people of Songdia Province, they are very different from the other three and four generations of the Central Plains people, because the working environment is extremely bad, they are often whipped, and the oarsmen who were rescued before resisted quite fiercely, and there is no trace of the Central Plains thieves, which shows that the Jinxuedi people are not all in all places to install the Central Plains thieves, and the Central Plains thieves are also picky about the posts.

After all, paddling is not farming and building roads, paddling is absolutely bitter and tired, they are all chained to the oars, and they have to face whipping from time to time, and their freedom in life is greatly restricted.

At present, the allied land forces are inferior in strength and equipment, and water warfare is a means of balancing combat power, and at the same time, warships can drive straight into the hinterland of the Jinxuedi people for a long time, carrying a huge amount of cargo, and it is extremely convenient to ship day and night, and the advantages of seizing warships are obvious.

Having made up his mind, Bailiyan set up camp on the spot, ordered him to cut down trees, build rafts, and select sailors, and at the same time sent a hundred cavalry back to the upper reaches of the Yasai Waterfall River to inform Gongliangwen of the news so that he would not be caught off guard.

On the night of the same day, the army moved into the plain north of the Derangi Pass, and the scouts released on the second day returned, and the marshes to the north crossed the two rivers from east to west, cutting off the north-south passage, and the width of the body was at least six or seven miles.

Unlike the Kebpigon Outer Lake Marsh and the West Mountain Outer Marsh, the Marsh of Derangi is located between two large rivers, the water system is extremely abundant, the swamp has a high water content, the water network is all over, the carbonized mud of the plants is not under the water, the landfill effect is not ideal, and the filled soil will soon be swallowed up by the swamp. Without the use of a large amount of manpower to cover and compact, it is unlikely that a large number of people will enter the Derangi Plain from the north of the swamp in the short term.

By dusk of the same day, the army had bundled more than 170 rafts, and the felling timber had been piled up. Bai Liyan looked at those bare roots, and couldn't help but sigh at how much damage the war had done to nature.

Since he went south, he has cut down no less than 1780,000 trees along the way, the smallest of which is 30 centimeters, and the largest is about two and a half meters in diameter, many of which are fine and precious timber. If this was in a previous life, it is estimated that he would be able to sit through the prison. So much so that a few years later, Bailiyan enacted a new law to restore the natural vegetation damaged by the war.

That night, Bai Liyan was measuring the speed of the water by the river, and he had to confirm the speed of the water so that he could estimate the speed and time, determine when to start, and reach the downstream just before dark.

Affected by factors such as wind, flow speed, tides, and hull structure, the speed of inland river ships in 24 hours ranges from 180 miles to more than 300 miles, or even more. The boat is the slowest when the wind and current are upwind and the fastest when the wind is downwind, and the water speed must be accurately estimated to arrive at the beginning and evening.

If it is a sea voyage, affected by more factors such as wind, ocean current, air current, humidity, sea density, resistance, temperature, hull shape, and load draft, the slowest sailing speed per hour is only two to three miles, and the fastest is more than ten miles.

Since it is a surprise attack, it is not possible to raise fire, if it is early, it is easy to be discovered, if it is late, it is invisible, and it is very easy to capsize and collide, so it is necessary to be careful. The so-called knowledge of astronomy and geography is roughly the same.

Jiang Jie has followed Bailiyan for many years, and he has benefited a lot, and the general calculation problems have been difficult for him:

"My lord, according to the current speed of the wind, our army will set out around midnight tomorrow, and should arrive at the lower reaches of the Cupigonsi River at dusk."

"The calculation is generally good." Baili Yan said pertinently, and then changed his words: "But the Jin Xuedi people have a pontoon bridge in the downstream section of the river, have you ever considered how to pass the pontoon bridge downstream?" ”

"We should send people to set off in advance, and before our brigade arrives at the pontoon bridge, we should go into the water to destroy the pontoon bridge, so as to maximize the time we can buy."

"But as soon as the pontoon bridge is destroyed, the defenders of the pontoon bridge will inevitably report to the garrison outside the West Mountain, and the enemy will definitely take precautions, so you can think about how to deal with it."

"This ...... The subordinates didn't think of it. ”

Jiang Jie blushed and didn't know how to deal with it, Bai Liyan comforted him and said:

"Passing through the pontoon bridge will inevitably be detected by the Jinxuedi people, but our army is not completely without opportunities. First of all, the enemy army guarding the bridge reported that the garrison outside the Xishan needed to be passed on along the way, and the garrison outside the Xishan still needed to be passed on to the bank of the Xihe River. The speed at which our troops rushed down the river across the pontoon bridge should be approximately equal to the speed of the enemy's reaction.

Therefore, at the moment when the enemy responds to increase troops and transfer ships, our army still has the possibility of a surprise attack in advance, and our army is on a raft, without sails, and is almost unaffected by the headwind at this time, and may be the first to surprise before the enemy reacts.

If we make a surprise attack before the enemy reacts, we can take more ships, but if we do it at the same time, our army will only have more than 4,000 soldiers in this ship robbery, and once the enemy detects, our army will never be able to take most of the ships. Therefore, the primary purpose of consolidating the victory of the battle should be to sail the ship back to Delangi, and not to be greedy. ”

"In this way, the Jinxuedi people can pursue from the water and land, and our naval army will be extremely passive at that time." Jiang Jie said competently.

"That's right, this kind of passivity does happen. However, the warships of the Jin Xuedi people are not large, and most of them are small boats, not counting oarsmen, and the large ships can carry up to 200 people, and the small boats can only carry more than 100 people or even less than 100 people.

Our army had 4,000 men, and it was more than enough to divide thirty or forty ships into warships, and after rescuing the oarsmen, they would alternate rowing with soldiers. Our army will sail against the tide much faster than theirs. ”

"Oh...... The subordinates understood that the Jin Xuedi people would definitely not paddle by themselves, and our army would take turns paddling at a faster speed than them. ”

"That's right, if you think about it, it's better to use people to row one hundred and thirty or forty miles against the current, and you can afford it with just a few dozen people, unless the Jin Xuedi people paddle by themselves, but it's obviously impossible. Therefore, after capturing the warship, carefully allocate the manpower and take turns rowing the oars, so that he can be faster than them.

Remember, if the enemy forces react before our army and increase the number of troops on the warships, you can continue to run down the river in the dark, go to the southwest of Chubigon Mountain, land into the mountain, and join Mr. Su, don't be rash and lose your life! ”

"Subordinates, remember!"

Jiang Jie is now able to take charge on his own, and Bai Liyan asked him to go north with Sikong Nan to hijack the ship, and also let him go out to practice.

After explaining the details to Jiang Jie, Bailiyan convened Sikong Nan and Yuke overnight to discuss the robbery.

The Yuke Southern Expedition transferred almost all the horses in the Central Plains to Qianyue Mountain, and the assassins were no exception, and the current matter of stealing chickens and dogs, destroying the pontoon bridge needs to be fine to every detail, not early, not late, let alone exposing his whereabouts in advance, Yuke is obviously more competent than the allied soldiers for this sabotage task.

So in the second half of the night, Baili Yan ordered the royal guests to sit on a raft and go down the river in the dark, abandon the boat and go ashore after dawn, and walk along the water, Sikong Nan and Jiang Jie attacked again after dawn.

Soon after Jiang Jie led the army to set off, Bailiyan transferred Baihe and Tian Pengxin to attach the people's army, went to the Delangi Pass along the west bank of the West River, and dug a ditch to the Delangji Mountain, so as to divert the water of the West River into the ditch and shorten the width of the road between the Delangi Pass and the West River.

Sikong Nan and Jiang Jie went down the river, successfully passed the pontoon bridge with the assistance of the royal guest, and arrived at the anchorage of the Jin Xuedi naval army at dusk of the same day. On the same day, they rowed overnight against the tide and returned to Dranky, and after two days of retrograde, the fleet arrived at Dranky.