Why did the Taiping Heavenly Kingdom fail?

The ultimate reason for the failure of the Taiping heavenly kingdom's northern expedition was that the troops were suspended in depth and the successors were weak.

185 1 year, the Taiping Heavenly Kingdom revolted today and moved northward. 1March 853, Nanjing was conquered and renamed Tianjing. In May of that year, Pai, Li and others went to the Northern Expedition with the intention of taking Beijing directly and destroying the Qing court. At this time, the Taiping Heavenly Kingdom was founded only two years ago and occupied Nanjing and other places for only two months. Before the foundation was solid, we sent troops to the Northern Expedition.

And Li, two brave soldiers under Xiao Chaogui, the king of the West, captured the city and were invincible. They were the best generals of Taiping Army except Shi Dakai and Wei Changhui at that time. The number of the Northern Expeditionary Army is small, only over 20,000, but all of them are veterans from Guangxi, with extremely rich combat experience and very firm revolutionary beliefs. Once, the Northern Expeditionary Army made great achievements. They left Pukou, and with the cooperation of the Nian Army in Huaibei, they left Anhui and entered Henan within a month. In September of the same year, they arrived in Jinghai and Liu Du, a suburb of Tianjin. Emperor Xianfeng was shocked by this, and even once planned to make a pilgrimage to chengde mountain resort in the north, and ordered provincial governors to send taxes directly to the emperor's palace.

But at this time, the Northern Expeditionary Army is already a spent force, far away from the Tianjing rear area, and there is no food or grass. And just marching along the way, not occupying the city, and having no base. Finally surrounded by the Qing army.

In a word, the more than 20,000 Northern Expeditionary Army led by He Li swept the regular army of the Qing Dynasty like autumn leaves in just half a year, and reached Pingjin from Pukou, which was a great miracle in the history of war. However, due to the Northern Expedition, there was no other army to take care of it, and it was far from the rear supply base, and it eventually failed.