This is a list constructed by N.S. Gill for about.com
Alaric the Visigoth
Alexander the Great
Attila the Hun
Cyrus the Great
Hannibal
Julius Caesar
Marius
Scipio Africanus
Sun Tzu
Trajan
If you follow the link to the article you can read descriptions of each man.
See the article here.
Western Paradigm 
what about achilles son of peleus
he’s not the greatest but i think he should be among the best military tacticians. i think many people overlook khalid bin walid. never lost a battle. routed the byzantines at yarmouk even though they’re outnumbere 2:1.
ceaser was a tactical magician as when he was fighting vercingetorix in gaul he was outnumbered 3to1. he had 80000 men compared to vercingetorix’s 240000 men and he still came out on top
What about Dusan The Powerfull
n wat about chanakya… ?? d greatest politician
what about gengis khan and ashoka the great….pardon me but i think every one here is calling the one who belong to the county they belong to, to be the greatest i think