Analyze the success or failure of Zhuge Liang's six trips to Qishan respectively. Great gods help.

Failure: without geography, the rugged rear supply of Shu Road could not keep up. In fact, if Jingzhou was still there at that time, it would be very different. When there is no weather, it will actually rain at the mouth of the gourd, but it is really fake. Personally, I feel that there is really no weather except Chibi. I still don't know why Zhuge Liang just doesn't reuse Wei Yan. At that time, Wei Yan was basically the most brave military commander, but he never really got the reuse of Zhuge Liang. That is, I never thought about cutting Wu. Imagine that if Shu and Wei county could annex Wu slightly, with the east as the breakthrough, they would not have to take the dangerous road like Qishan. Success: Jiang Wei, successor. Lost countless generals, but it is worth mentioning that Ma Su beheaded in tears. Of course, it is recognized by the generals, even if Jiang Wei is the most useful.