Jingzhou and Xiangyang, why have they been battlegrounds for military strategists since ancient times?

Why is Xiangyang a battleground for military strategists? This should start from the surrounding geography where Xiangyang is located. Xiangyang belongs to Xiangfan City, Hubei Province, bordering Dabie Mountain and Tongbai Mountain in the east, Huaihe River in the east, Qinling Mountain in the west and Xichuan Mountain in the west. Xiangyang is located at the intersection of Tanghe River and Baihe River, and then flows into the Han River. Xiangyang, on the other hand, is located at the intersection of the three rivers, and Xiangyang City is backed by many small mountains such as Xianshan and Hutou Mountain. It can be said that Xiangyang city is impregnable. With this terrain, we can only say that Xiangyang is a place that is easy to defend but difficult to attack, but it does not mean that it has strategic value (for ancient times). He is heavy, relying on the Nanyang Basin on his back, until the Yellow River is in an emergency, with Jianghan Plain in the south, Nanling in the east, the end of the Yangtze River in the east, and Hanzhong in the west entering Sichuan and Shaanxi. Since ancient times, there has been a saying that seven provinces are thoroughfares. It can be seen that its strategic value is heavy. During the Three Kingdoms period, Guan Yu led an army to attack Xiangyang, completing Zhuge Liang's plan of going out to Jingxiang in the north to seize the Central Plains, and was defeated by Sun Quan's attack on Jingzhou. At that time, why did Wu leave Hefei when Guan Yu and the fierce battle won, but instead of taking the opportunity to attack Hefei, he dared to take great risks and abandon the contract to seize Jingxiang? There is a simple reason. The land of Jingxiang is Wu's throat, and it is not enough for Jingxiang to rest in Jiangdong without protecting Wu. Hefei's flat terrain is conducive to Cao Cao's northern cavalry fighting, which is not conducive to Jiangdong Water Army. However, Sun Quan is rather stupid, and his fighting skill is far less than that of his father Sun Jian and his younger brother Sun Ce. To seize Jingxiang, he had to face the Cao army in Xiangyang, the Cao army in Huainan and the Shu army in Xichuan, all of which were in poor condition. Give the land of Jingxiang to Liu Beize, and let Liu Jun hold the land of Jingxiang for him. Dongwu only faces the Jun of Dongwu. Liu is weak in strength, Shu soldiers are hard to defeat Cao Jun, Wei is not destroyed, Liu does not advance, and he can only take advantage of people's danger. However, when Sun Quan was about to win Xiangyang in Jingzhou where Guan Yu was incompetent for more than 20 years, he was taken away by Sun Quan and all his generals were killed. Liu Bei rose up against Wu and almost lost his capital. Xiangyang was occupied by Cao Jun in less than ten years, and Liu Bei led an army to attack Soochow. Isn't it all for the reward of his brother? Its purpose is to capture Xiangyang and complete the purpose of marching into the Central Plains. Or Zhuge Liang did not object to Liu Bei's attack on Wu Dong? It can be seen that the Three Kingdoms is a city in Xiangyang, and the generals of Wei, Shu and Wu went in and out to win this place (at that time, Shu was Guan Yu, Guan Ping, Zhou Cang and Ma Liang; Wu Shi, Lu Xun and Lu Su; Is Wei Coss, Huang Xu, Zhang Liao, Xia Houdun or Wargo? The most important thing in Xiangyang is that the Southern Song Dynasty fought against Jin Meng. After Zhao Gou, the great ancestor of the Southern Song Dynasty, established his capital in Lin 'an (present-day Hangzhou), he was under strong military pressure from Daikin in the north (resisted by Princess Xin Youyue). After the capture of Kaifeng (the capital of the Northern Song Dynasty), nomadic people quickly went south to destroy Zhao in one fell swoop. On the way south, Song Bing fled, but when attacking Xiangyang, the garrison commander abandoned the city and fled. Xiangyang people joined forces with some officers and men to rise up against the enemy. In this way, the troops blocked Daikin. When the nomads from the Southern Song Dynasty in Xiangyang attacked the imperial court, they panicked and sent generals to guard it. Only Yue Fei's eastward expedition can stop the pace of nomads from going south. Even if the last three passes were lost, I couldn't touch the calcaneus of the Southern Song Dynasty. In the Yuan Dynasty, Yuan soldier Khan led an army to attack Xiangyang, besieged it for seven years, and finally died at the gates of Xiangyang. The Jin and Yuan Dynasties failed to attack Xiangyang and had to change their route. (The Yuan Dynasty finally attacked go to dali first) In the third year of Xianchun (1267), Liu Zheng, commander-in-chief of the Southern Song Dynasty, presented Kublai Khan with the strategy of attacking and destroying the Southern Song Dynasty, "attacking Xiangyang first and removing its cover". He believes that there is no Huai without the item, and there is no Huai in the south of the Yangtze River without Huai. Liu Zheng's "strategy of attacking the Song Dynasty should be to engage in Xiangyang first". Xiangyang city was broken, and the Southern Song Dynasty could not support it for a year, so it was over, which shows the importance of Xiangyang. After Li Zicheng left Tongguan, he first attacked Xiangyang and became king, then went north to the capital. In order to prevent the Ming army from going north to Xiangyang and breaking its back road, it can also go south directly after pacifying the north. At that time, when the PLA marched into Wuhan and Sichuan, it also attacked Xiangyang first, leaving more than 4,000 martyrs in Xiangyang.