All is Fair in Love and War
Sherman's march was a very important march that in my opinion he needed to do. The reason I think this is because I think he struck fear into the Confederate's army. He also showed them what the Union were capable of doing. So yes what he did was fair to me.
Just like Sherman did with the Confederate, Hitler in a way did the same thing. He showed the other countries what the Nazis were capable of doing. He destroyed the lives of jews and terrified them. He also conquered other countries which is like what Sherman did. Sherman conquered different cities that the Confederate had.