[August]

I'd say it was impossible to accurately pick a best military commander out of all human history. It is too varied and extensive. Julius Caesar, Alexander the Great, Xenophon, Rommel, Jackson, Patton, Wellington, Hannibal, von Lettow, Napoleon, Cortez, Nelson, Schwartzkopf to name a few, each was great in his own time. All could be argued as better or worse than the others.