Have you guys heard of Liddell Hart? He was the British military theorist whose book(s) on the indirect approach was put into practice by Guderian in WWII. Guderian, in case you don't know. was the father of blitzkrieg tactics. In any case, Liddell Hart holds Belisarius in very high esteem. However, I would like to mention a name that usually never appears on a list of the greatest generals, Scipio Africanus. Hart wrote a very interesting book about him. Hart wrote another book (title escapes me) about the greatest generals in history. If my memory serves correctly, he concluded the two greatest generals were Napolean and Ceasar. He though Napolean a better general than Ceasar because Ceasar was too impulsive at times. Napolean's problem was that he abandoned the indirect approach when he commanded armies with vast numbers, thinking the sledgehammer approach would work better. Hart also mentioned Hannibal, Ganghis Khan (also a master of the indirect approach), Lee, Grant, Sherman, Guderian, and Patton.
Another book, which I read many years ago, was titled From the Jaws of Victory: Causes and Consequences of Military Stupidity. The book covers generals like Crassus.