the decisive battle of Alexander the Great's invasion of the Persian Achaemenid Empire. In 331 BC Alexander's army of the Hellenic League met the Persian army of Darius III near Gaugamela, close to the modern city of Dohuk in Iraqi Kurdistan. Though heavily outnumbered, Alexander emerged victorious due to his army's superior tactics and his deft employment of light infantry. It was a decisive victory for the Hellenic League and led to the fall of the Achaemenid Empire.
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Several researchers have criticized the Persians for their failure to harass Alexander's army and disrupt its long supply lines when it advanced through Mesopotamia.
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And because my first inclination was to be entertained with scenes of pomp and magnificence, I desired to see Alexander the Great at the head of his army, just after the battle of Arbela: which, upon a motion of the governor’s finger, immediately appeared in a large field, under the window where we stood. Alexander was called up into the room: it was with great difficulty that I understood his Greek, and had but little of my own. He assured me upon his honour “that he was not poisoned, but died of a bad fever by excessive drinking.”
Jonathan Swift. Gulliver's Travels Into Several Remote Regions of the World (1726)