Alexander the Great's Greatest Victory (opens in new tab)

In October 331 BC, one of the most important battles of world history occurred on the plain of Gaugamela. Alexander III of Macedon, better known as Alexander the Great, had been campaigning east of the Aegean Sea against the Persian Empire for 3 ½ years. Already he had won a series of notable victories and conquered many lands west of the Euphrates River. But it would be on 1 October 331 BC that a 25 year old Alexander came up against his biggest challenge to date. A large army, gathered by t...