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Battle of the Persian Gate

Part of the Wars of Alexander the Great

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Through Persepolis

Background

The Achaemenid Empire suffered a series of defeats against the Macedonian forces at Granicus (334 BC), Issus (333 BC) and Gaugamela (331 BC), and by the end of 331 BC Alexander had advanced to Babylon and Susa. A Royal Road connected Susa (the first Persian capital city in Elam) with the more eastern capitals of Persepolis and Pasargadae in Persis, and was the natural avenue for Alexander's continued campaign. Meanwhile, King Darius III was trying to raise a new army at Ecbatana. Ariobarzanes was charged with preventing the Macedonian advance into Persis. He relied heavily on the terrain Alexander needed to pass through. There were only a few possible routes through the Zagros Mountains, which were made more hazardous by winter's onset.

After the conquest of Susa, Alexander split the Macedonian army into two parts. Alexander's general, Parmenion, took one half along the Royal Road, and Alexander himself took the route towards Persis. Passing into Persis required traversing the Persian Gates, a narrow mountain pass that lent itself easily to ambush.

During his advance, Alexander subdued the Uxii, a local hill people that had demanded the same tribute from him they used to receive from the Persian kings for safe passage. As he passed into the Persian Gates, he met with no resistance. Believing that he would not encounter any more enemy forces during his march, Alexander neglected to send scouts ahead of his vanguard and thus walked into Ariobarzanes' ambush.

The valley leading up to the Persian Gate is wide, allowing the Macedonian army to enter the mountains at a full march. Ariobarzanes occupied a position near the modern-day village of Cheshmeh Chenar. The road curves to the southeast (to face the rising sun) and narrows considerably at that point, making the terrain particularly treacherous, thus well suited for Ariobarzanes's purposes. According to the historian Arrian, Ariobarzanes had a force of 40,000 infantry and 700 cavalry and faced a Macedonian force of over 10,000. However, some modern historians have claimed these figures for the Achaemenid force to be grossly exaggerated and implausible. Encyclopædia Iranica suggests defenders, as few as 700, and no more than 2000, based on the maximum number of troops likely at Ariobarzanes' disposal, but it notes that most modern historians follow Arrian, Curtius, and Diodorus unreservedly.

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