Battle of Gaugamela
The Battle of Gaugamela (; ), also called the Battle of Arbela (), was a battle that 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 Alexander's complete conquest of the empire.