The water is clear and the peaks are steep. Different from the mountains and rivers of Jiangnan and Huainan, Xiong Jing has a taste of sudden separation. In the future, wouldn't it be nice to build a palace in such a place and row a boat and play in the water? It's a pity that this era is not the era of touring the mountains and rivers and trysts with goddesses, Xiangshui and Ganshui have built flying stations, and he has a distress message in Panyu when Zhao Guo asks for help almost every day. If Zhao is like this, Chu will not be too far away, otherwise why would he go to the trouble to meet with the Baiyue tribes? Why do you want to personally inspect Yuechengling, one of the five ridge defense lines?

The blood is boiling during the battle, but the preparation for the war is so boring. Moreover, no one knows whether the defense line of northern Vietnam and the defense line of Wuling, which were built at great expense, will really work.

In fact, history has proved that the five mountains are not enough to defend. Qin attacked Lingnan to build a spiritual canal to transport grain, and the troops were divided into four routes; The Han Dynasty sent troops to Lingnan, but it took the Guiyang Road (through Linwu). Although the five ridges are steep, but the ridges are not like the connection, there are many trails in the middle, and the soldiers who infiltrate the trails bypass the passes, and over time, they can always achieve the effect.

This couldn't help but remind Xiong Jing of the old Ying again. The security of the provinces south of the Yangtze River is determined by the ownership of the Jianghan Plain. The state of Chu has lost its old Ying, and the only thing that is fortunate is that Xiayi (Wuchang) is still in his hands. The priority of Xiayi is higher than that of other cities in the country, and second only to Daliang, where construction has now begun.

Although Huaishang is fertile, it is not really a strategic location. Once the girder is lost, the Jianghuai will be the battlefield of the fight. As long as Xiayi and Huainan hold on, the southeast can be stable, the so-called 'those who are husband and Wuchang, the southeast will survive, and those who will die will also die'. However, offense is the best defense, and if you can recover the old Ying, and build the later Xiangfan two cities at the intersection of Bai, Tang and Han water, then everything will be perfect.

However, from Xiang Yan's point of view, this will inevitably lose Zhao Guo. The old Ying's battle plan formulated by the Operations Division was very treacherous, and the timing of the dispatch of troops was chosen when the Zhao State could not support it and Handan was about to be broken, and the weak division and false division cooperated with the Wei army to feint to the Yellow River, and made a rescue situation to encourage the Zhao people to fight and attract the Qin army to draw the last reserves.

Then, Xiong Jing guessed that the most perfect time to attack in the heart of the combat division was the moment when the outer city of Handan was broken by the Qin army, and then the 200,000 elite Chu troops entered the old Ying, destroying everything where the Qin State was.

The plan was exquisitely made, but the state of Zhao perished. Xiang Yan strongly opposed this, believing that the value of Old Ying was far inferior to that of Zhao Guo. Chu and Zhao, one south and one north, to contain the Qin State, is the best defense at the moment. If you want to contain it, you must save Zhao; Since he saved Zhao, he couldn't surround Wei to save Zhao like Sun Bin did. The siege of Wei could not save Zhao, although the Wei army returned to the division and was ambushed, but the Wei army retreated after breaking through Handan.

*

Arriving at the source of Lishui, Xiong Jing, accompanied by the chief of Xiou Jijun, rode a horse and walked through the Yuecheng Ridge himself. If it weren't for the Yue and Chu feudal people between the mountains and mountains, it would be difficult for outsiders to find this passage over Vietnam and Vietnam. Even with the guidance of the Yue people, before standing on the top of the mountain, Xiong Jing did not know where the Yuecheng Ridge was.

After climbing several mountains in a row, Xiong Jing saw the Xiangshui tributary (Yangyang River) heading north on the right, and the upper reaches of Lishui (Shi'an Shui) heading south on the left. The nearest part of the two rivers is about 20 kilometers apart, and this section of the ridge is much lower than the front and rear ridges, which is the Yuecheng Ridge: a soil watershed with a width of 300 meters and a height of 20 meters.

"Can I dig a ditch here?" Feng Ren is very young, he is the son of Feng Ren Jiao, called Qiao. If he hadn't tied his hair, he would almost have been lost to the Yue people.

"Your Majesty, yes. Extremely easy too. Feng Renqiao said.

"Easy?" Xiong Jing looked at him, wondering if he was pretending to be shocking or if it was true.

"Yes." The young man pointed to the low forest road. "If you dig a ditch, you will need water, and without water, it will be useless to make a ditch. From the minister's point of view, the water is not enough to lead, but the water can be diverted to the canal. This water is also this water, but this water is lower than the Li water......"

"Low?" The forest is dense, and the bears can't tell which one is high and which one is low.

"Yes, yes." A simple level was brought up, and then waved back by Xiong Jing, an instrument he invented. "The Hunan water is nearly six meters lower than the Li water, and if you want to lead the Hunan water into the canal, you need to build a dam of seven meters, which is one also; However, if the dam can be built farther away, the Xiangshui is only 1.5 meters lower than the Lishui, and only one zhang of the dam needs to be built. However, the ditch is longer than the former. ”

"Geometry?" Xiong Jing asked, seemingly able to understand that he was talking about those two positions.

"It's only ninety miles." The little seal person corrected. "Dig 90,000 square meters of mud and build a stone dam of more than 20,000 square meters."

"Only digging 90,000 square meters of mud?" Xiong Jing was surprised by the small amount of work. The city builder will need fifteen working days, but you don't need to dig the mud. Even if it takes ten working days to dig one side of mud, 90,000 square meters of mud and 10,000 people to build, it will be completed in three months, and more than 20,000 square stone dams are simpler. "If there are 10,000 people, it can be done in half a year?"

"It's only half a year." Feng Renqiao said. "The Qin people don't have cement tendons, so they thought they were elected to this policy."

"Is there a good solution?" Xiong Jing asked. Hearing that Lingqu could be completed in half a year, he immediately frowned.

"Yes." Feng Renqiao's eyebrows are very similar to Feng Renjiao, and his speech is also like that. "King, please see, the front and back mountain beams, the low place is the Yuecheng Ridge, but only this section is low, the minister has measured, the low place is only nineteen miles, if you can build a city here, you can stop this canal."

The Lingqu runs east-west, from east to west, while the Yuechengling runs north-south. If a city were to be built on a low ridge about nineteen miles long, there would be nowhere to dig the spiritual canal.

"Good!" Xiong Jing finally smiled slightly, which was what he wanted to hear the most. "What about the rest of the realms?"

"The rest of the provinces will also build the city." Feng Renqiao said. Fortification is the most common and effective way to defend a city.

"What is the remainder?" Xiong Jing asked. According to the standard set by the government, it takes 95 gold to build a mile of city wall, although it is not necessary to use concrete in the mountains, you can use stones, but the cost should be a lot, especially in the mountains, the traffic is inconvenient, and the weather is hot and sultry.

"The rest ......" Feng Renqiao hesitated for a moment, and when he saw Xiong Jing looking at himself, he had to say: "The rest is more than two hundred miles." ”

"More than two hundred miles?!" Xiong Jing was taken aback, this was beyond his imagination, he thought that the spiritual canal was long, but he didn't expect the spiritual canal to be so short.

"Yes. Linwu is the longest, and three sections of the city wall need to be built, which is more than 110 miles long; Du Pang Ling secondly, it is necessary to build two sections of the city wall, more than 80 li; The rest is not long, eighteen miles, ten miles, a total of two hundred and fifty miles. ”

Two hundred and fifty miles greatly exceeded Xiong Jing's expectations, but compared to the Great Wall built by various countries and the Fangcheng built by Chu in the Nanyang Basin, it was already very short. Two hundred and fifty miles, even if it is built concrete, as long as the transportation is convenient, it is only twenty or thirty thousand gold. If this money is divided over 10 or 15 years, it is not a lot.