Greatest battle involving a siege in history
He never did anything by half -- most effective siege, ever, by anyone -- and I'm even counting the Assyrian sieges, which were ruthless, but they were also over with fairly quickly, ancient shock and awe. A common phrase in the Assyrian kings' description is, "I burned with fire".
Of course, the Roman siege (70 AD) of Jerusalem was somewhat similar -- the Romans built a barrier around the Old City, meanwhile one Jewish faction controlled the Temple, another controlled another area. And Masada -- although that's difficult to call a siege per se, as the terrain made the place naturally isolated on all sides but one.
Well, and Vespasian (same era as the siege of Jerusalem) made his name using Roman artillery and standard infantry tactics to reduce British hill forts, one after the other, in a single season of warfare -- again, ancient shock and awe.