The Battle of Gaugamela occurred during the Asiatic campaign of Alexander the Great, and was a Macedonian victory over the Persians in 331 BC, about 80 km north-east of Nineveh (now Al Mawsil, Iraq). This battle broke the rule of Darius and gave Alexander the whole of Asia Minor. Alexander, at the head of a force of about 47,000 Macedonians and Greeks, was confronted by about 120,000 Persians under Darius. He personally led his right wing in an attack against the junction of the Persian centre and left wing, separating them and then taking the Persian centre in its flank. The Macedonian left was also pressing the Persians hard; Darius' forces gave way between the two Macedonian wings and a rout ensued with Darius forced to flee. Alexander's force pursued them hard, with considerable slaughter, before the last of the Persians managed to escape. Research Battle of Gaugamela