Although Lu Bu already had a fast communication tool like carrier pigeons, this kind of communication was one-way after all, and could only be received but not sent.
So while laying traffic lines from Chang'an to Xiayang, he also built a special communication line.
This is a line of communication that utilizes optical and visual communication.
On average, one communication station is set up every five hundred meters, and signals are transmitted between adjacent stations through a flap.
Each flip panel has two colors: black and white, and sixteen flip panels form a black and white block matrix.
Each matrix can represent a total of 65,536 Chinese characters of 2 raised to the 16th power.
Each communication base station has five such matrices, which means it transmits information to the next base station, and each time it can transmit information of five Chinese characters.
The operation time, that is, the time it takes for five people to spell out five matrices, takes about 20 seconds each time.
Then it would take about an hour to send five words to Chang'an, which is 300 miles away.
But this does not mean that it takes two hours to transmit ten words.
It is the same as the principle of the assembly line.
Transmitting more information will only increase the time a little.
Of course, the operation is not just as simple as flipping the board.
There are certain communication protocols and rules between stations to ensure that the information transmitted will not be confusing and error-prone.
From a distance of 500 meters, if you want to see the color of the big flap clearly, you can only use telescopes made of non-optical glass.
Due to the chromatic aberration effect, these telescopes cannot clearly image distant objects.
But you can clearly see whether the big square is white or black.
The communication station located in Chang'an's mansion ordered the soldiers to use binoculars to stare at the information board set up at the communication station at the top of the city.
Convert the black and white binary matrix information on each sign into decimal numbers.
The number is then handed over to the code breaker, who breaks the high, middle and low digits of the number into three small digits.
Based on these three small numbers, he found the Chinese characters on page n, row n, and column n in the codebook, and then neatly wrote the Chinese characters on a piece of paper.
Soon, a note appeared in front of Lu Bu.
There was only one line on it: "My subordinate Zhang Liao has arrived in Xia Yang."
Lu Bu knew that this was the message Zhang Liao had sent from Xia Yang about an hour ago.
Lu Bu said happily, "This is a great feat in the history of human communication", and ordered his soldiers to reply.
The message was received and the experiment was successful.
This is just the first communication line.
According to Lu Bu's plan, several such communication lines will be set up in Lu Bu's stable control area in the future, and the technology will be upgraded to make it more efficient and stable, and can also be used at night.
If such a communication network is built, it will not only be used for military purposes, but also for civilian use to generate income.
The income will be enough to support all the personnel who maintain the operation of the communication network.
In the midsummer of the sixth year of Jian'an, because Xu You rebelled against Yuan and defected to Cao, Yuan Shao's army's grain-harvesting base, Wuchao, was exposed and was successfully raided by Cao's army.
The situation on the Guandu battlefield became clear from this, and Yuan Shao's defeat was determined.
Liu Bei, who had originally taken refuge with Yuan Shao, saw that the situation was not good and believed that Yuan Shao could not succeed.
In the name of going south to connect with Liu Biao, he ran away with a group of troops.
After he arrived in Nanyang County, he defected to Liu Biao and stationed troops in Xinye as his guest general, guarding the north gate of Jingzhou for Liu Biao.
At the end of summer in the sixth year of Jian'an, Yuan Shao's army was defeated and 70,000 people were wiped out.
Cao Cao crossed the Yellow River north to pursue Yuan Shao's retreating army and reached Yecheng.
In Lu Bu's mansion in Chang'an, Chen Gong asked Lu Bu: "My lord, if we don't send troops to capture Bingzhou now, how long will it take?"
Lu Bu said calmly: "There is no rush, let us wait, there is something better."
The timing."
Sure enough, in the winter of the sixth year of Jian'an, Yuan Shao died of illness.
His second son Yuan Tan and Yuan Shang fought for heirs and successively brought their direct troops in Bingzhou and Youzhou to Jizhou to fight the civil war.
In the spring of the seventh year of Jian'an, a man sneaked across the Yellow River with his family and dozens of soldiers, and defected from Yuan Shao's Bingzhou to Lu Bu's Guanzhong.
This person was Qu Yi, the former commander of Yuan Jun's first camp.
After receiving the news, Lu Bu quickly summoned him in Chang'an.
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After a conversation, it turned out that as expected, Yuan Shao did not use Qu Yi after he returned to Yuan Camp.
Because the Xiandeng camp had been completely wiped out, Yuan Shao directly canceled the establishment of the battalion and did not rebuild the Xiandeng camp.
Qu Yi was left alone, and Yuan Shao even forgot about him.
Qu Yi thought this was because Lu Bu released him after being captured alive, which led to Yuan Shao's distrust of him.
But he didn't know that it was precisely because he was captured alive by Lu Bu and the Xianden camp was destroyed that he and his family's lives were saved.
Qu Yi originally wanted to disband his troops and return to his fields for the rest of his life.
But since the two Yuans fought for heir, Yuan Shang thought of Qu Yi again and wanted to use him again.
At this time, Qu Yi had distanced himself from the Yuan family, and anyone with a discerning eye knew that the Yuan family's regime would not last long.
He no longer wanted to be used by the Yuan family, but he was afraid that Yuan Shang would harm him and his family, so he simply brought his family to join Lu Bu.
At the end, Qu Yi knelt down on one knee and knelt down to Lü Bu, begging Lü Bu for his shelter.
Lu Bu hurriedly said: "General Qu, please come up quickly.
Your joining our army will make our army even more powerful."
Then he ordered people to arrange a residence for Qu Yi and his family.
Soon, Zhang Liao, who was stationed in Xia Yang, received a message and acted according to the established strategy to march to Bingzhou.
Just one day later, five pontoon bridges appeared on the Yellow River next to Xia Yang.
Lu Bu's horsemen and baggage rolled across the bridge.
In this eastern expedition to merge the states, Lu Bu dispatched two tiger warriors and 30,000 county soldiers, accounting for nearly 40% of his total military strength.
Yuan Tan was eager to compete with Yuan Shang for the so-called "foundation" of Jizhou, and had no time to worry about merging states on the western front.
This allowed Lu Bu's army to easily cross the Yellow River eastward.
After crossing the river, it was like entering an uninhabited land.
All the counties and counties along the way surrendered with their seals and ribbons.
In the autumn of the sixth year of Jian'an, Zhang Liao's troops had already entered Jinyang and merged the prefectures.
Ma Chao had also entered Shangdang County in the eastern part of Bingzhou.
After several small-scale battles, Ma Chao arrived at Huguan City, the seat of Shangdang County.
The rest of the county towns in Shangdang County surrendered and surrendered to Lu Bu.
Now Yuan Tan only has an isolated city in Huguan left in his hands, and the guard is the unknown Peng An.
Because Yuan Tandong left Jizhou to fight for heirs, Shangdang County was also depleted of troops.
Peng An, who stayed behind in Shangdang, knew that it was impossible to defend the entire Shangdang County with such a small force.
So all the county's grain and nearly 8,000 elite soldiers were gathered in Huguan.
Prepare to hold on to Huguan and wait for Yuan Tan's return reinforcements.
The 20,000 county soldiers led by Ma Chao quickly surrounded Huguan.
According to Lu Bu's strategy, they only surrounded Huguan but did not attack.
It took more than a month for the 20,000 soldiers to build a trench and barrier around Huguan, leaving only Five thousand people continued to besiege Huguan, and the remaining troops headed north to Leping County.
Before the troops arrived, the prefect of Leping sent someone to surrender.
Soon, Ma Chao joined forces with Zhang Liao, who was heading south from Jinyang.
At this time, the entire Bingzhou, except for the northernmost Dingxiang County, which was occupied by a Xianbei tribe a hundred years ago, and Huguan, which has not surrendered yet, all other counties and counties have surrendered to Lu Bu.
However, Lu Bu's army's battle in Bingzhou had just begun.
Lu Bu captured all the cities on the plains of the Bingzhou Basin.
In the wild mountains in the southeast of Bingzhou, there is still a huge force named Zhang Yan's Black Mountain Army active
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