The red circle is Dabie Mountain, the red line is Yangtze River, and the yellow circle is Wuhan, Hefei and Nanjing. In the middle of the Yangtze River, there is a long section around Dabie Mountain. Once you enter Dabie Mountain, you can threaten Wuhan, Hefei and other military towns at the same time, and then seize Nanjing. Let's talk about the routine of Nanjing regime's defense against the northern attack since ancient times.
The first is Wuhan.
The red circle is a mountainous area, the Yangtze River is below the red line and the Han River is above the red line. The two rivers meet in Wuhan. The most important thing in marching and fighting is supplies and water. No food can stand for a few days, and no one can stand without water. It doesn't matter if there are three or five people, but tens of thousands of troops must March along the river, otherwise it is not enough to rely on a few wells in the village, and water transportation is much more efficient than highway. The loss of grain transportation on the road is more than 90% (so is the cart), so it is safer for large troops to take the water.
It can be seen that the geographical position of Wuhan, which is located at the intersection of the Han River and the Yangtze River, is extremely important. If the northern regime wants to attack the south from the west, it must take Wuhan, and its position is more conducive to defense. If Wuhan is captured, Nanjing can be attacked downstream. It was here that Sun Quan of Soochow forged a stone city, and Wuhan became an important city to defend Cao Wei at that time. This is West Road. . .
Look at East Road again. . . .
The red is Dabie Mountain, the red on the right is Chuzhou Mountain, and the yellow circle is Huainan (Shouchun), Hefei and Nanjing. The purple area is Chaohu Lake.
Hefei is also an important city for the north to attack the Nanjing regime, because there is a waterway from Huainan to Hefei and then to the Yangtze River in the north. The supply of the northern army can be continuously sent to the Yangtze River basin by water transport, and Huainan and Hefei can be captured, and then the next step can be to concentrate on threatening Nanjing. At this time, it will be more stable to have reinforcements from Wuhan. As can be seen from the picture, there are two ways for Hefei to attack Nanjing. The first way is to take Chuzhou. Zuiwengting said, "There are mountains around the Chu River". It can be seen that the road of this generation is not easy to walk and the transportation of materials is not convenient, but it is relatively close and suitable for small troops to sneak attack. When Hou Jing rebelled, Hou Jing led 2000 people to seize power from Chuzhou. There is also a safer road, that is, from Chaohu Lake to the Yangtze River, and then downstream, capturing Nanjing. Zhuge Liang, a descendant, said, "Cao Cao Can can't attack Changba in five, but Chaohu Lake in four." The so-called Sidu Chaohu Lake is the place where military operations are launched.
To sum up, it can be seen that the Nanjing regime will be at a loss when it enters the Dabie Mountains, because it is difficult to judge where this army will attack. There are many important towns around Dabie Mountain (there are still many left unsaid), and none of them can stand the attack, just like the bones in the throat, especially when the main force in the northern rear area is empty, which will make the Nanjing regime panic. Therefore, we can only choose to shrink our troops, thus disrupting the strategic deployment. The so-called cited without jumping.
But this strategy also has risks. Although Dabie Mountain area has many advantages, it will also face the problem of inconvenient supply, which is why few people have done so before. But the battle always coexists with risks and opportunities, and the leap into Dabie Mountain has also made unexpected achievements.