Major battle of the Wars of Alexander the Great (331 BC)
The Battle of Gaugamela ( GAW-gə-MEE-lə; Ancient Greek: Γαυγάμηλα, romanized: Gaugámēla, lit. 'the Camel's House'), also called the Battle of Arbela (Ἄρβηλα, Árbēla), took place in 331 BC between the forces of the Army of Macedon under Alexander the Great and the Persian Army under King Darius III. It was the second and final battle between the two kings, and is considered to be the final blow to the Achaemenid Empire, resulting in its complete conquest by Alexander.
https://en.wikipedia.org/wiki/Battle_of_Gaugamela