After the Battle of Yiyang, Xinling Jun ordered the Wei army to return to Luonan Dao, leaving only 30,000 people in Pang Xuan's army.

The remnants of Wang Qi suffered another defeat in the Tang Dynasty and retreated to Mengjin, intending to join the Qin army in Luoyi.

On the one hand, Pang Xuan bluffed in Luonan Road and Yiyang, and continued to make the illusion of besieging Yiyang City; On the other hand, he sent troops north to Quyang, and made a gesture of preparing to join forces with the Korean army to encircle and annihilate the remnants of Wang Qi in the area of Mengjin Luoyi, so as to confuse the judgment of the Qin court.

At the Nanluo River crossing, the sky has just dawned, and the entire river is already covered with boats.

These boats traveled north from the south bank, crossed Luonan Road, traveled south to Xinjin, followed the Jinshui north, reached Lushi, and continued north to Pusaka, only to the rear of the Qin army in the west of the river.

At this time, ships of various sizes lined up on the river, moving slowly like a long dragon, and occasionally a few large boats splashed on the water, causing the surrounding rafts to take refuge.

The Wei army had requisitioned all the boats within hundreds of miles in the vicinity, and cut down wood for boats to transport soldiers and grain and grass, so that the river was full of dense rafts of large and small sizes.

"Brother Fu, the wooden float you made has crossed the line." Zhang Tan stared at the wooden tools placed in the river and said.

"Brother Zhang, just scoop up the wooden float." Fu Nian recorded the time when the wooden float floated across the river.

Time is the measure of distance, he reduced the scale length on the wooden board in proportion to the river section, and then made a time ruler according to the flow velocity formula to mark the corresponding time, and carried out segmented measurements, plus mental time for correction.

The method he used was to select a straight river section, measure the area of the water flow cross section in a section of the river section, and find the area of its average cross section.

Then put the buoy in the upstream river section, measure the time required for the buoy to flow through the determined river section (L), repeat the measurement many times, and obtain the average value of the time required (t), then the flow velocity (L/t) can be calculated, and then the flow velocity is calculated by the formula.

Zhang Tan scooped up the wooden float from the river, weighed it in his hand, and put it aside, he had already put it away several times.

"Brother Nian, 6 drops of water are dropped, which is 4.8 seconds." Yu Chan'er stared at the water leak and said.

Fu Nian told her that a drop of water was 1.25 seconds, and when she asked what a second was, he told her that it was a moment and taught her arithmetic, saying that it was multiplication.

This is a simple time drain that he made, and he placed five wooden vessels in steps, chiseled a small hole under each of them, and measured the height of the water from one noon to the second noon in the bottom part of the wooden vessel, and divided this height into twenty-four equal parts, and then divided it into five equal parts in each scale for accuracy.

After completion, as long as you write down the number of water droplets in a scale, you can calculate how many seconds a water drop is equal to, and then convert it into an exact time.

"Thank you, Yu'er." Fu Nian stopped what he was doing and turned his head to Yu Chan'er.

He knew that this girl seemed to be weak, but in fact she had to be tough in her heart, and she didn't want to be a burden to herself.

So he taught her the basics, so that she could do some simple work, counting the time it took to float across the river.

He taught her some simple arithmetic, and the girl learned quickly, and she was a smart person.

Maybe when she returns to Daliang, she can be taught to read and write, and to teach her to read and write, and to learn how to count at li, music, poetry, painting, and mathematics.

Yu Chan'er was quite happy when she heard this, and a faint flush appeared on her beautiful little face.

After Fu Nian counted the data, he summarized the hydrological conditions from the mouth of the local household water man and summarized it into a silk book, marked the positive and negative dimensions and river conditions, and drew a water map.

"Xinlingjun, I have drawn a hydrological map." After Fu Nian drew the hydrological map, he went to find Xinlingjun.

"Nian, if you can break the Qin army in this battle, you will also contribute a lot." Xin Lingjun attaches great importance to him.

At such an age, he is proficient in the arts, numbers, and objects, and he is really a strange person.

"Fu Nian didn't dare to take credit." He said that he would give the hydrological map to Xinlingjun.

Xin Lingjun took the water map and looked at it, and he already had a plan in his heart.

If you take the waterway, the speed of marching against the current, it will take three days for the Wei soldiers to cross south to Xinjin by boat. However, the speed of marching down the river after arriving in Xinjin is only one day from Xinjin to Lushi. If you travel by road plus the necessary baggage, it will take at least eight days.

He had already sent Ji Yanran, Yang Gongxie and Wei Qingshan's battalion to clear the Qin army and spies on the road.

He needed to fight the Qin army with an information gap, and before Meng Fu and the Qin court could respond to the defeat of Wang Qi's army, he would go straight to the rear of the Meng Fu army outside the river.

Taking the waterway can save half the time, and he can only choose to take the waterway.

The first group of nearly 10,000 soldiers assembled on the river beach, stood in formation, weapons in hand, and waited for orders.

Xin Lingjun stood at the front of the line, watching the big boats on the river in the distance slowly but surely sail north.

As the last soldier to board the ship, Fu Nian also followed the fleet to board the ship and headed for Xinjin.

The slender girl stood on the stone steps by the river, looking at the big boat that was gradually moving away in the distance, and her heart was a little stunned.

She stayed here, and without his help, she would have died under the sword of the Qin army.

………

The night is as cool as water, and everything is silent. The reeds of the river beach swayed, and occasionally a few insects chirped.

Deep in the reeds, several wooden boats sailed silently, cutting through the mist that filled the air.

Wei Wushu of the Shanzi Battalion put on his armor and was putting on the final inspection and maintenance of his weapons. Many people have grease on their knives, and the night is cold and cold, and there are often cases where the knife cannot be drawn out of the sheath.

For this night attack, everyone wore a layer of black on their armor, like ghosts wandering in the dark.

In the Xinjin Qin army camp, the gate was closed, and only two teams of patrols were guarding the wall with halberds.

To the north, on the hillside about fifty zhang away from the camp gate, dozens of figures were hidden behind an uneven rock.

Previously, Yang Gongxie sneaked into the Qin army camp to investigate, and he had a grasp of the internal arrangement, and there were about more than 1,000 Qin soldiers stationed in Xinjin.

"It's almost time, the people of the mountain camp should be almost there, act." Ji Yanran raised her head and looked to the south, and ordered in a deep voice.

Except for them, a group led by Xue Zhu was lurking in the bushes to the west. Their mission was to kill the escaped Qin soldiers who appeared in the Qin camp and clean up the fish that had slipped through the net.

The Qin soldiers standing guard in the Qin army's camp gradually revealed their figures in the light of the firelight, and they did not notice that danger was approaching.

Suddenly, in an inexplicable blink, this group of Qin soldiers only felt that the acupoints and heart veins around their bodies seemed to be bizarrely captured, and they suddenly felt suffocated, and the retrograde feeling of blood and qi surged all over their bodies, their lips opened slightly but they couldn't make a sound, and they even had difficulty breathing, and they collapsed to the ground in an instant, dying of exhaustion.

Yang Gongxie's finger skills and claw skills can be described as unpredictable.

As long as he holds any part of the opponent's body, even if it is hair or earlobes, he can control the enemy's death.

These Qin soldiers were caught off guard and killed with one move, and there was no room for resistance at all.

Seeing that the sentry had been extinguished, everyone quickly ran out of their hiding place, sneaked into the camp of the Qin army, and killed anyone they saw without hesitation.

When the Wei Wushu of the Shanzi battalion arrived, the Qin camp was already in disarray, the army was disheartened, scattered and fled, countless Qin troops were cut down in a pool of blood, bright red blood stained the earthy yellow mud and sand, and the air was filled with a strong smell of blood.

"Kill!" Wei Qing shouted, holding a long sword in his hand, and led his soldiers to rush towards the enemy formation.

Under the leadership of Wei Qing, Wei Wushu rushed into the Qin camp, stabbing left and right like a tiger entering a flock, and countless Qin soldiers screamed and fell to the ground.

With the addition of Wei Wushu, the outcome of this battle is already doomed.

………

Xinjin Ferry, at this time, had become a temporary camp for the Wei army. Not far from the river, boats slowly approached, followed by a bridge made of rafts.

After docking, the Wei soldiers fixed the boat board with ropes, and built a wooden plank road along the shore to dock the raft.

After the first Wei soldiers disembarked, they carried supplies ashore and emptied the ferry in preparation for the arrival of the subsequent army.

Wei Qing, as the chief officer of the Wei Wushu, took over the command and ordered the Wei soldiers under his command to collect the camp tents near the ferry, and at the same time arrange for manpower to build a new camp.

The Wei army needs to land all of them within today's day.