I want to ask Baidu: Is the calligraphy "Man Jiang Hong" on the wall of Wuhou Temple in Chengdu, Sichuan really Yue Fei's handwriting? If so, when did he practice?

Probably not.

Whether the word "Man Jiang Hong" was written by Yue Fei or entrusted by later generations is still a mystery. Public opinion about calligraphy?

It's hard to say whether it's handwriting.

On the other hand, these are not very important, because history is like this: historical phenomena are given meaning, so new materials are added.

Just believe that Yue Fei is a great military commander.