First of all, there is a knack for army morale.
Zeng Guofan thought that the soul of the army should be gathered together, not scattered. Everyone knows at all times and in all countries that in marching and fighting, the higher the morale, the better. "The narrow road meets the brave and wins". So he always tries his best to cheer for his army.
Second, in the face-to-face management of the army, it is emphasized to be down-to-earth and not vain. Zeng Guofan has always ruled the army with Confucianism and is known as the "Confucian general". He thinks that soldiers are not good enough and serenade is strong. He also emphasized "discipline", which is why Fiona Fang cannot live without rules. He asked soldiers to observe discipline at all times and not to harass the people, so his army was very popular and loved by the people.
Finally, the main feature of Zeng Guofan's training is that the main content of the book "Routine of Xiang Army's Day Shift" is roll call, exercise and standing on the wall. It's not easy to say, but it's very difficult to really do it. Although it is superficial, it is indeed the key to Zeng Guofan's army management.
Although Zeng Guofan is a generation of Confucian generals, he can not lead troops, but he can run the army. We admire him for influencing and infecting the army with Confucian demeanor and benevolence.
These are the reasons why Zeng Guofan, as a Confucian general, was able to manage the army so strongly.
I only express my personal views. If there are any corrections, please comment on them.