At that time, modu chanyu besieged Liu Bang. Why didn't he catch it for seven days and seven nights?

When Liu Bang led an expedition to the Huns, the Han army led by him was an elite who had just entered the war and had strong fighting capacity. The Han army is good at defense, especially in mountainous areas, and tarkan's operational advantage cannot be brought into play. So Liu Bang can persist for seven days and seven nights.

In 20 1 BC, Han Wangxin was worried that Liu Bang would find an excuse to kill himself, so he decided to surrender to the Huns and unite with them to attack the Han army. Liu Bang personally led an army of 320,000 troops to personally expedition, and just started Lien Chan winning streak. Liu bang was carried away by successive victories. When he led troops to pursue Deng Baishan, he was surrounded by 400,000 Xiongnu troops led by modu chanyu. Liu Bang was forced to come to Deng Bai with his troops and held his ground with the help of the terrain.

At this time, it was crucial for Liu Bang. The Xiongnu army outside the encirclement was 20 times that of the Han army. The Han army was short of food and grass and the weather was extremely cold, so many people were severely frostbitten. However, the Han army led by Liu Bang is a battle-hardened elite with strong combat capability, adaptability to extreme weather and strong fighting will. Other Han armies are also taking the time to rally to Deng Baishan, and diligent military forces from all over the country are advancing to Xiongnu from the periphery.

For the Huns, the general time to send troops is in autumn. In winter, the weather is bad, their important property, cattle and sheep, is easy to freeze to death, and the horses are not strong enough, and the weather supply is very troublesome, and the Huns are also struggling to support them. Moreover, attacking the top of the mountain is not conducive to giving full play to tarquin's operational advantages, while tackling key problems is the disadvantage of Xiongnu, and sticking to it is the advantage of Han army.

Xiongnu troops attacked day and night, hoping to make a quick decision. The longer it takes, the worse it will be for him. With more and more Han troops outside, modu chanyu may feel that he won't get any benefits, and may even be surrounded by counterattacks. So, at the suggestion of the Xiongnu Queen, Liu Bang was released.