People often say "He who wins the Central Plains wins the world", this sentence is actually very contradictory. The Central Plains is indeed the best ruling center in ancient times, but it is also the place of the Four World Wars. Every building must be in your home. Can you keep chaos at the door? Therefore, in ancient times, many troops started from the four realms, and finally encompassed the Central Plains and unified the country, but few directly emerged from the Central Plains to dominate one side.
In the early days of the Warring States period, the most powerful state of Wei was like this. It was beaten by strong neighbors every day and finally destroyed. In this regard, the Cao Cao of the Three Kingdoms is unprecedented. This time let's talk about the dangerous geography of Cao Cao on the road to the unification of the north with a small force! Indeed, looking back at Wei Wu's life, the use of troops was all in one danger. When he emerged, the big powers had already occupied the land that could be separated. The strongest is Yuan Shao, who straddles the four continents in the lower reaches of the Yellow River.
In addition, there is Yuan Shu in Nanyang, Liu Biao in Xiangyang and Jiangling, Chengdu is the father and son of Liu Yan and Liu Zhang, Hanzhong Zhang Lu, and grandson of Liaodong Du, Youzhou Gongsun Zan, Xuzhou Tao Qian, and Sun Jian, Sun Ce and his sons, Lu Bu, Zhang Yang, Zhang Xiu, and many other princes, like leeks, cut and grow again. When Cao Cao rose, he did not take the usual path. He levied troops from the vagrants, thieves, and foreign nationals. First broke the Black Mountain Army and collected more than 100,000, and then broke the Yellow Turban Army to collect 300,000 to form the Qingzhou Army. With this elite, By attacking Tao Qian, he got the initial turf. Later, Po Lu Bu took the pottery, divided the troops to pacify Yanzhou, and the hegemony was initially determined.
Cao Cao’s preference for risk made him precede Yuan Shao. Before other forces became bigger and stronger, he welcomed the Emperor Xian of the Han Dynasty to his turf Xuchang. Large tracts of land in the south. Xuchang is in the middle of Henan. It is limited to the Yellow River to the north and Hulaoguan to the west. There is a danger of mountains and rivers. Nantong Cai and Deng are the rear areas for attacking the Huaihe River and Hanshui area. After the emperor was settled in Xuchang, Cao Cao's next important goal was Yecheng, a strategically important place. After the Battle of Guandu, Cao Cao finally won the base camp of Yuan Shao Group with all his troops. From then on, it became the capital of the Wei state. Later, when Cao Pi established Luoyang as the capital of the Han Dynasty, Ye was still one of the five capitals. Wudu Zhonghaocheng was the hometown of Cao Cao, Luoyang was the capital of Han Dynasty, Chang'an was the relic of Xijing of the Han Dynasty, Xuchang was the old capital, and Ye was the "foundation of Wangye base".
Through various military and political means, Cao Cao stabilized the north. Without the ability to unify the whole country, operating a major border defense town became a top priority. Later Emperor Wei Ming concluded that "the first emperor placed Hefei in the east, defended Xiangyang in the south, and Gu Qishan in the south." These three places became the most important frontier defenses.
On the Eastern Front, Cao Wei and Soochow fought for 39 years in the Jianghuai area. Cao Cao took the lead and started recruiting refugees from 196, all the way from Xudu. Tuntian to the Huaihe River Basin. In 209, Cao Cao entered the Huaihe River and exited Feishui from the Wukou, setting Hefei as an important town. From then on, Cao Cao returned to Huaixi, and he could free his hands and feet to seek Wu in Huaidong.
Xiangyang in the central defense line is the most troublesome city for Cao Cao. Back then, Sun Jian was defeated by Liu Biao here. After the Battle of Chibi, Cao Cao lost Jiangling and was heavily guarded here. . Beginning in 219, Guan Yu besieged Xiangyang several times, and Cao Cao feared his military power and even planned to move the capital. As a result, Sun Quan stabbed a knife in the back, causing Xiangyang to remain under the control of Cao Cao, and later became the basis for the destruction of Wu.
On the Western Front, after Xia Houyuan lost Hanzhong, Cao Wei’s line of defense moved north to the Qishan area of Longxi. Zhuge Liang made several northern expeditions. Qishan sent troops only twice, but his entire use of troops was centered in the west but not in the east, but he could never make a breakthrough. Cao Cao’s military geography is extremely bold. In the years of the Southern and Northern Wars, Zhuge Liang said that he was “trapped in Nanyang, in danger in Wuchao, in danger in Qilian, forced to Liyang, almost defeated in Beishan, and died in Tongguan” everywhere. A place where you must die, but you don’t have to die. This actually gave allGe Liang had great confidence in the Northern Expedition, but his luck was obviously better than that of Zhuge Liang.