Battle of Gaugamela
|Battle of Gaugamela|
|Part of the Wars of Alexander the Great|
Battle of Gaugamela, Flemish tapestry, first half of 18th century
|Commanders and leaders|
|Alexander the Great
Simmias of Macedon
Ariston of Macedon
Glaucias of Macedon
Sopolis of Macedon
Orontes II †
(See Size of Macedonian army)
|52,000–100,000 (modern estimates)
250,000–1,000,000 (ancient sources) (See Size of Persian army)
|Casualties and losses|
|100 infantry and 1,000 cavalry
(according to Arrian);
(according to Curtius Rufus);
(according to Diodorus Siculus)
(according to Curtius Rufus)
(according to Welman)
(according to Diodorus Siculus)
(according to Arrian)
The Battle of Gaugamela (//; Greek: Γαυγάμηλα), also called the Battle of Arbela, was 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 Erbil (Iraqi Kurdistan) . Even though heavily outnumbered, Alexander emerged victorious due to his superior tactics and army. It was a decisive victory for the Hellenic League and led to the fall of the Achaemenid Empire.
- 1 Background
- 2 Prelude
- 3 Location
- 4 Size of Persian army
- 5 Size of Macedonian army
- 6 The battle
- 7 Aftermath
- 8 References
- 9 Sources
- 10 External links
In November 333 BC, Darius III had lost the Battle of Issus resulting in the capture of his wife, his mother, and his two daughters, Stateira II and Drypetis. Darius had retreated to Babylon, where he regrouped the remaining army from the previous battle. The victory at Issus had given Alexander control of southern Asia Minor. Following a victory at the Siege of Tyre (332 BC) which lasted from January to July, Alexander controlled the Levant. After his victory at Gaza, Persian troop counts were low and the Persian satrap of Egypt, Mazaces, peacefully surrendered to Alexander.
Negotiations between Darius and Alexander
Darius tried to dissuade Alexander from further attacks on his empire by diplomacy. Ancient historians provide different accounts of his negotiations with Alexander, which can be separated in three negotiation attempts.
Justin, Arrian and Curtius Rufus write that Darius sent a letter to Alexander after the Battle of Issus. The letter demanded that he withdraw from Asia and release his prisoners. According to Curtius and Justin he offered a ransom for his prisoners, but Arrian does not mention a ransom. Curtius describes the tone of the letter as offensive. Alexander refused his demands.
A second negotiation attempt took place after the capture of Tyre. Darius offered Alexander a marriage with his daughter Stateira II and all the territory west of the Halys river. Justin is less specific, not mentioning a specific daughter and speaking of a portion of Darius' kingdom. Diodorus Siculus likewise mentions the offer of all territory west of the Halys river, a treaty of friendship and a large ransom for the captives. Diodorus is the only ancient historian who mentions that Alexander concealed this letter and presented his friends with a forged letter favorable to his own interests. Again Alexander refused.
Darius started to prepare for another battle after the failure of the second negotiation attempt. Even so, he made a third and final effort to negotiate after Alexander's departure from Egypt. Darius' third offer was much more generous. He praised Alexander for the treatment of his mother Sisygambis and offered him all territory west of the Euphrates, co-rulership of the Achaemenid Empire, the hand of one of his daughters and 30,000 talents of silver. In the account of Diodorus, Alexander deliberated this offer with his friends. Parmenion was the only one who spoke up, saying "If I were Alexander, I should accept what was offered and make a treaty." Alexander reportedly replied "So should I, if I were Parmenion." Alexander again refused the offer of Darius, insisting that there could be only one king of Asia. He called on Darius to surrender to him or to meet him in battle to decide who was to be the sole king of Asia.
The descriptions given by the other historians of the third negotiation attempt are similar to the account of Diodorus, but differ in details. Diodorus, Curtius and Arrian write that an embassy was sent instead of a letter, which is claimed by Justin and Plutarch. Plutarch and Arrian mention the ransom offered for the prisoners was 10,000 talents, but Diodorus, Curtius and Justin give a figure of 30,000. Arrian writes that this third attempt took place during the Siege of Tyre, where the other historians place the second negotiation attempt. With the failure of diplomacy, Darius decided to prepare for another battle with Alexander.
After settling affairs in Egypt, Alexander returned to Tyre during the spring of 331 BC. He reached Thapsacus in July or August of 331 BC. Arrian relates that Darius had ordered Mazaeus to guard the crossing of the Euphrates near Thapsacus with a force of 3,000 cavalry. He fled when Alexander's army approached to cross the river.
Alexander's march through Mesopotamia
After crossing the Euphrates Alexander followed a northern route instead of a direct southeastern route to Babylon. While doing so, he had the Euphrates and the mountains of Armenia on his left. The northern route made it easier to forage for supplies and did not feature the extreme heat of the direct route. When some Persian scouts were captured, they reported to the Macedonians that Darius had encamped past the Tigris river and wanted to prevent Alexander from crossing. Alexander found the Tigris undefended and succeeded in crossing it with great difficulty.
In contrast, Diodorus mentions that Mazaeus was only supposed to prevent Alexander from crossing the Tigris. Mazaeus would not have bothered to defend it because he considered it uncrossable due to the strong current and depth of the river. Furthermore, Diodorus and Curtius Rufus mention that Mazaeus employed scorched earth tactics in the countryside Alexander's army had to pass.
After the Macedonian army had crossed the Tigris a lunar eclipse occurred. Following the calculations, the date must have been October 1st in 331 BC. Alexander then marched southwards along the eastern bank of the Tigris. On the fourth day after the crossing of the Tigris his scouts reported that Persian cavalry had been spotted, numbering no more than thousand men. When Alexander attacked them with his cavalry force ahead of the rest of his army, the Persian cavalry fled. Most of them escaped, but a few were slain or taken prisoner. The prisoners told the Macedonians that Darius was not far away, with his encampment near Gaugamela.
Several researchers have criticized the Persians for their failure in harassing Alexander's army and disrupting its long supply lines when it advanced through Mesopotamia. Peter Green thinks that Alexander's choice for the northern route caught the Persians off guard. Darius would have expected Alexander to take the faster southern route directly to Babylon, just as Cyrus the Younger had done in 401 BC before his defeat in the Battle of Cunaxa. The use of the scorched earth tactic and scythed chariots by Darius suggests that he wanted to repeat that battle. Alexander would have been unable adequately to supply his army if he had taken the southern route, even if the scorched earth tactic would fail. The Macedonian army, underfed and exhausted from the heat, would then be defeated at the plain of Cunaxa by Darius. When Alexander took the northern route, Mazaeus must have returned to Babylon to bring the news. Darius most likely decided to prevent Alexander from crossing the Tigris. This plan failed because Alexander probably took a river crossing that was closer to Thapsacus than Babylon. Darius would have improvised and chosen Gaugamela as his most favorable site for a battle. Jona Lendering argues the opposite and commends Mazaeus and Darius for their strategy. Darius would have deliberately allowed Alexander to cross the rivers unopposed in order to guide him to the battlefield of his own choice.
Darius chose a flat open plain where he could deploy his larger forces, not wanting to be caught in a narrow battlefield as he had been at Issus two years earlier, where he could not deploy his huge army properly. Darius had his soldiers flatten the terrain before the battle, to give his 200 war-chariots the best conditions. However, this did not matter. On the ground were few hills and no bodies of water that Alexander could use for protection, and in the autumn the weather was dry and mild. The most commonly accepted opinion about the location is ( ), east of Mosul in modern-day northern Iraq – suggested by Sir Aurel Stein in 1938 (see his Limes Report, pp. 127–1).
Size of Persian army
|Units||Low estimate||High estimate|
Some ancient Greek historians suggest that the main Persian army numbered between 200,000 and 300,000, but some modern scholars[who?]suggest that it was no larger than 50,000 because of the logistical difficulty of fielding more than 50,000 soldiers in battle at the time. However, it is possible that the Persian army could have numbered over 100,000 men. One estimate is that there were 25,000 peltasts, 10,000 Immortals, 2,000 Greek hoplites, 1,000 Bactrians, and 40,000 cavalry, 200 scythed chariots, and 15 war elephants. Hans Delbrück estimates Persian cavalry at 12,000 because of management issues, Persian infantry (peltast) less than that of the Greek heavy infantry, and Greek mercenaries at 8,000.
Warry estimates a total size of 91,000; Welman 90,000; Delbrück (1978) 52,000; Engels (1920) and Green (1990) no larger than 100,000.
According to Arrian, Darius's force numbered 40,000 cavalry and 1,000,000 infantry, Diodorus Siculus put it at 200,000 cavalry and 800,000 infantry, Plutarch put it at 1,000,000 troops (without a breakdown in composition), while according to Curtius Rufus it consisted of 45,000 cavalry and 200,000 infantry. Furthermore, according to Arrian, Diodorus, and Curtius, Darius had 200 chariots while Arrian mentions 15 war elephants. Included in Darius's infantry were about 2,000 Greek mercenary hoplites.
While Darius had a significant advantage in numbers, most of his troops were of a lower quality than Alexander's. Alexander's pezhetairoi were armed with a six-metre pike, the sarissa. The main Persian infantry was poorly trained and equipped in comparison to Alexander's pezhetairoi and hoplites. The only respectable infantry Darius had were his 2,000 Greek hoplites and his personal bodyguard, the 10,000 Persian Immortals. The Greek mercenaries fought in a phalanx, armed with a heavy shield but with spears no longer than three metres, while the spears of the Immortals were 2 metres long. Among the other Persian troops, the most heavily armed were the Armenians who were armed the Greek way, and probably fought as a phalanx. The rest of Darius's contingents were much more lightly armed; the main weapon of the Achaemenid army historically was the bow and arrow, and javelin.
Size of Macedonian army
|Heavy infantry||31,000|
|Light infantry||9,000|
Alexander commanded Greek forces from his kingdom of Macedon and the Corinthian League along with Thracian allies. According to Arrian, the most reliable historian of Alexander (who is believed to be relying on the work of the eye-witness Ptolemy) his forces numbered 7,000 cavalry and 40,000 infantry. Most historians agree that the Macedonian army consisted of 31,000 heavy infantry, including the mercenary and hoplite from other allied Greek states in reserve, with an additional 9,000 light infantry consisting mainly of peltasts with some archers. The size of the Greek mounted arm was about 7,000.
The battle began with the Persians already present at the battlefield. Darius had recruited the finest cavalry from his Eastern satrapies and from an allied Scythian tribe and deployed scythed chariots, for which he had ordered bushes and vegetation removed from the battlefield to maximize their effectiveness. He also had 15 Indian elephants supported by Indian chariots.
Darius placed himself in the centre with his best infantry as was the tradition among Persian kings. He was surrounded by, on his right, the Carian cavalry, Greek mercenaries, and the Persian horse guards. In the right-center he placed the Persian foot guards (Apple Bearers/Immortals to the Greeks), the Indian Cavalry and his Mardian archers.
On both flanks were the cavalry. Bessus commanded the left flank with the Bactrians, Dahae cavalry, Arachosian cavalry, Persian cavalry, Susian cavalry, Cadusian cavalry, and Scythians. Chariots were placed in front with a small group of Bactrians. Mazaeus commanded the right flank with the Syrian, Median, Mesopotamian, Parthian, Sacian, Tapurian, Hyrcanian, Caucasian Albanian, Sacesinian, Cappadocian, and Armenian cavalry. The Cappadocians and Armenians were stationed in front of the other cavalry units, and led the attack. The Albanian and Sacesinian cavalry were sent around to flank the Greek left.
The Macedonian were divided into two, with the right side under the direct command of Alexander, and the left of Parmenion. Alexander fought with his Companion cavalry. With it were the Paionian, and Greek light cavalry. The mercenary cavalry was divided into two groups, veterans on the flank of the right and the rest in front of the Agrians and Greek archers, which were stationed next to the phalanx. Parmenion was stationed on the left with the Thessalians, Greek mercenaries, and Thracian cavalry. There they were to pull off a holding maneuver while Alexander landed the decisive blow from the right.
On the right-centre were Cretan mercenaries. Behind them were Thessalian cavalry under Phillip, and Achaean mercenaries. To their right was another part of the allied Greek cavalry. From there came the phalanx, in a double line. Outnumbered over 5:1 in cavalry, with their line surpassed by over a mile, it seemed inevitable that the Greeks would be flanked by the Persians. The second line were given orders to deal with any flanking units should the situation arise. This second line consisted of mostly mercenaries.
Beginning of the battle
Alexander began by ordering his infantry to march in phalanx formation towards the center of the enemy line. The Macedonian advanced with the wings echeloned back at 45 degrees to lure the Persian cavalry to attack. While the phalanxes battled the Persian infantry, Darius sent a large part of his cavalry and some of his regular infantry to attack Parmenion's forces on the left.
During the battle Alexander used an unusual strategy which has been duplicated only a few times. While the infantry battled the Persian troops in the center, Alexander began to ride all the way to the edge of the right flank, accompanied by his Companion Cavalry. His plan was to draw as much of the Persian cavalry as possible to the flanks, to create a gap within the enemy line where a decisive blow could then be struck at Darius in the center. This required almost perfect timing and maneuvering, and Alexander himself to act first. Alexander would force Darius to attack (as they would soon move off the prepared ground) though Darius did not want to be the first to attack after seeing what happened at Issus against a similar formation. In the end Darius' hand was forced, and he attacked.
The cavalry battle in the Hellenic right wing
The Scythian cavalry from the Persian left wing opened the battle by attempting to flank Alexander's extreme right. What followed was a long and fierce cavalry battle between the Persian left and the Macedonian right, in which the latter, being greatly outnumbered, were often hard pressed. However, by careful use of reserves and disciplined charges, the Greek troopers were able to contain their Persian counterparts, which would be vital for the success of Alexander's decisive attack.
As told by Arrian:
- "Then the Scythian cavalry rode along the line, and came into conflict with the front men of Alexander's array; but he nevertheless still continued to march towards the right, and almost entirely got beyond the ground which had been cleared and levelled by the Persians. Then Darius, fearing that his chariots would become useless, if the Macedonians advanced into the uneven ground, ordered the front ranks of his left wing to ride round the right wing of the Macedonians, where Alexander was commanding, to prevent him from marching his wing any further. This being done, Alexander ordered the cavalry of the Grecian mercenaries under the command of Menidas to attack them. But the Scythian cavalry and the Bactrians, who had been drawn up with them, sallied forth against them, and being much more numerous they put the small body of Greeks to rout. Alexander then ordered Aristo at the head of the Paeonians and Grecian auxiliaries to attack the Scythians; and the barbarians gave way. But the rest of the Bactrians, drawing near to the Paeonians and Grecian auxiliaries, caused their own comrades who were already in flight to turn and renew the battle; and thus they brought about a general cavalry engagement, in which more of Alexander's men fell, not only being overwhelmed by the multitude of the barbarians, but also because the Scythians themselves and their horses were much more completely protected with armour for guarding their bodies. Notwithstanding this, the Macedonians sustained their assaults, and assailing them violently squadron by squadron, they succeeded in pushing them out of rank."
The tide finally turned in the Greek favor after the attack of Aretes' Prodromois, likely their last reserve in this sector of the battlefield. By then however the battle has been decided in the center by Alexander himself.
- "The Persians also who were riding round the wing were seized with alarm when Aretes made a vigorous attack upon them. In this quarter indeed the Persians took to speedy flight; and the Macedonians followed up the fugitives and slaughtered them."
Attack of the Persian scythed chariots
Darius now launched his chariots at those troops under Alexander's personal command, many of these were intercepted by the Agrianians and other javelin-throwers posted in front of the Companion cavalry. Those chariots who made it through the barrage of javelins charged the Macedonian lines, which responded by opening up their ranks, creating alleys through which the chariots passed harmlessly. The Hypaspist and the armed grooms of the cavalry then attacked and eliminated these survivors.
Alexander's decisive attack
As the Persians advanced farther and farther to the Greek flanks in their attack, Alexander slowly filtered in his rearguard. Alexander disengaged his Companions, and prepared for the decisive attack. Behind them were the guards brigade along with any phalanx battalions he could withdraw from the battle. He formed his units into a giant wedge, with him leading the charge. The Persian infantry at the center were still fighting the phalanxes, hindering any attempts to counter Alexander's charge.
This large wedge then smashed into the weakened Persian center, taking out Darius's royal guard and the Greek mercenaries. Darius was in danger of being cut off, and the widely held modern view is that he now broke and ran, with the rest of his army following him. This is based on Arrian's account:
- "For a short time there ensued a hand-to-hand fight; but when the Macedonian cavalry, commanded by Alexander himself, pressed on vigorously, thrusting themselves against the Persians and striking their faces with their spears, and when the Macedonian phalanx in dense array and bristling with long pikes had also made an attack upon them, all things together appeared full of terror to Darius, who had already long been in a state of fear, so that he was the first to turn and flee."
A less common view is that Darius's army was already broken when Darius ran, and is supported by an astronomical diary from Babylon written within days of the battle:
- The twenty-fourth [day of the lunar month], in the morning, the king of the world [i.e., Darius] [erected his] standard [lacuna]. Opposite each other they fought and a heavy defeat of the troops [of the king he inflicted]. The king [i.e., Darius], his troops deserted him and to their cities [they went]. They fled to the land of the Guti.
The left flank
Alexander could have pursued Darius at this point. However, he received desperate messages from Parmenion (an event which would later be used by Callisthenes and others to discredit Parmenion) on the left. Parmenion's wing was apparently encircled by the cavalry of the Persian right wing, and being attacked from all sides were in a state of confusion. Alexander was faced with the choice of pursuing Darius and having the chance of killing him, ending the war in one stroke, but at the risk of losing his army, or going back to the left flank to aid Parmenion and preserve his forces, thus letting Darius escape to the surrounding mountains. He decided to help Parmenion, and followed Darius later.
While holding on the left, a gap had opened up between the left and center of the Macedonian phalanx, due to Simmias' brigade of pezhetairoi being unable to follow Alexander in his decisive attack, as they were being hard pressed. The Persian and Indian cavalry in the center with Darius broke through. Instead of taking the phalanx or Parmenion in the rear, they continued towards the camp to loot. They also tried to rescue the Queen Mother, Sisygambis, but she refused to go with them. These raiders were in turn attacked and dispersed by the rear reserve phalanx as they were looting.
What happened next was described by Arrian as the fiercest engagement of the battle, as Alexander and his companions encountered the cavalry of the Persian right, composed of Indians, Parthians and "the bravest and most numerous division of the Persians", desperately trying to get through to escape. Sixty Companions were slain in the engagement, and Hephaestion, Coenus and Menidas were all injured. Alexander prevailed, however, and Mazaeus also began to pull his forces back as Bessus had. However, unlike on the left with Bessus, the Persians soon fell into disorder as the Thessalians and other cavalry units charged forward at their fleeing enemy.
|This section does not cite any sources. (September 2014)|
After the battle, Parmenion rounded up the Persian baggage train while Alexander and his bodyguard pursued Darius. As at Issus, substantial loot was gained, with 4,000 talents captured, the King's personal chariot and bow, and the war elephants. It was a disastrous defeat for the Persians and one of Alexander's finest victories.
Darius managed to escape with a small corps of his forces remaining intact. The Bactrian cavalry and Bessus caught up with him, as did some of the survivors of the Royal Guard and 2,000 Greek mercenaries.
At this point, the Persian Empire was divided into two halves–East and West. On his escape, Darius gave a speech to what remained of his army. He planned to head further east and raise another army to face Alexander, assuming that the Greeks would head towards Babylon. At the same time, he dispatched letters to his eastern satraps asking them to remain loyal.
The satraps, however, had other intentions. Bessus murdered Darius before fleeing eastwards. When Alexander discovered Darius murdered, he was saddened to see an enemy he respected killed in such a fashion, and gave Darius a full burial ceremony at Persepolis, the former ceremonial capital of the Persian Empire, before angrily pursuing Bessus, capturing and executing him the following year. The majority of the remaining satraps gave their loyalty to Alexander and were allowed to keep their positions. The Achaemenid Persian Empire is traditionally considered to have ended with the death of Darius.
- and Warry (1998) estimates a total size of 91,000, Welman 90,000, Delbrück (1978) 52,000, Thomas Harbottle 120,000,broken link Engels (1920) and Green (1990) no larger than 100,000.
- Alexander Defeats the Persians, 331 BC, History.com website
- Arrian 1893.
- Arrian 1893, 3.1.
- Diodorus Siculus 1963, footnote 79.
- Justin 1853, 11.12.1–2; Arrian 1893, 2.14; Quintus Curtius Rufus 1880, 4.1.7–14.
- Justin 1853, 11.12.1–2; Quintus Curtius Rufus 1880, 4.5.1–8.
- Diodorus Siculus 1963, 17.39.1–2.
- Diodorus Siculus 1963, 17.54.1–6.
- Diodorus Siculus 1963, 17.54.1–6; Quintus Curtius Rufus 1880, 4.11; Arrian 1893, 2.25.
- Justin 1853, 11.12; Plutarch 1919, 4.29.7–9.
- Arrian 1893, 2.25.
- Arrian 1893, 3.6.
- Arrian 1893, 3.7; Diodorus Siculus 1963, footnote 62.
- Arrian 1893, 3.7.
- Diodorus Siculus 1963, 17.55; Quintus Curtius Rufus 1880, 4.9.14.
- Diodorus Siculus 1963, footnote 77.
- Arrian 1893, 3.7–8.
- Ward 2014, p. 24; Cummings 2004, p. 216.
- Green 2013, p. 282–285.
- Lendering 2004.
- Hanson 2007, p. 69–72.
- Delbrück 1990.
- Quintus Curtius Rufus 1880.
- Arrian 1893, 3.11.
- Arrian 1893, 3.8.
- Diodorus Siculus 1963, 17.53.
- Plutarch 1936, 31.1.
- Quintus Curtius Rufus 1880, 4.12.13.
- Hanson 2007, p. 70–71.
- Hanson 2007, p. 61.
- Arrian 1893, 3.13.
- Arrian 1893, 3.14.
- A contemporary Babylonian account of the battle of Gaugamela
- This is shown reliably in the movie Alexander.
- Ancient sources
- Arrian (1893). Chinnock, E. J., ed. Anabasis Alexandri.
- Diodorus Siculus (1963). Welles, C. Bradford, ed. Library of History 8. Cambridge, Massachusetts: Harvard University Press. ISBN 978-0-674-99464-5.
- Plutarch (1936). "On the Fortune or the Virtue of Alexander". In Babbitt, Frank Cole. Moralia 4. Cambridge, Massachusetts: Harvard University Press. pp. 379‑487. ISBN 978-0-674-99336-5.
- Plutarch (1919). "Life of Alexander". In Perrin, Bernadotte. Lives 7. Cambridge, Massachusetts: Harvard University Press. pp. 707‑741. ISBN 978-0-674-99110-1.
- Justin (1853). Watson, John Selby, ed. Epitome of the Philippic History of Pompeius Trogus. London: Henry G. Bohn.
- Quintus Curtius Rufus (1880). Vogel, Theodor, ed. Histories of Alexander the Great. London.
- Modern sources
- Cummings, Lewis Vance (2004). Alexander the Great. New York, New York: Grove Press. ISBN 978-0-8021-4149-1.
- Delbrück, Hans (1990). History of the Art of War. Translated by Walter J. Renfroe Jr. Lincoln, Nebraska: University of Nebraska Press. ISBN 978-0-8032-6584-4.
- Doge, Theodore Ayrault (1918). Alexander: A History of the Origin and Growth of the Art of War from the Earliest Times to the Battle of Ipsus, B.C. 301. Tales End Press. ISBN 978-1-105-60250-4.
- Engels, Donald W. (1980). Alexander the Great and the Logistics of the Greek Army. Berkeley and Los Angeles, California: University of California Press. ISBN 978-0-520-04272-8.
- Fox, Robin Lane (2006). Alexander the Great. Penguin UK. ISBN 978-0-14-192598-1.
- Fuller, J. F. C. (1987). A Military History of the Western World: From the earliest times to the Battle of Lepanto. A Military History of the Western World 1. Da Capo Press. ISBN 978-0-306-80304-8.
- Green, Peter (2013). Alexander of Macedon, 356–323 B.C.: A Historical Biography. Berkeley and Los Angeles, California: University of California Press. ISBN 978-0-520-95469-4.
- ——— (1993). Alexander to Actium: The Historical Evolution of the Hellenistic Age. Hellenistic Culture and Society 1. Berkeley and Los Angeles, California: University of California Press. ISBN 978-0-520-08349-3.
- Lendering, Jona (2004). "What Happened at Gaugamela?".
- Hanson, Victor Davies (2007). Carnage and Culture: Landmark Battles in the Rise to Western Power. Anchor Books. ISBN 978-0-307-42518-8.
- De Santis, Marc G. (2001). "At The Crossroads of Conquest". Military Heritage 3 (3): 46–55, 97.
- Van der Spek, R. J. (2003). "Darius III, Alexander the Great and Babylonian Scholarship". In Henkelman, W.; Kuhrt, A. A Persian Perspective: Essays in Memory of Heleen Sancisi-Weerdenburg. Achaemenid History 13. Leiden: Nederlands Instituut voor het Nabije Oosten. pp. 289–342. ISBN 978-90-6258-413-0.
- Ward, Steven R. (2014). Immortal: A Military History of Iran and Its Armed Forces. Washington, D. C.: Georgetown University Press. ISBN 978-1-62616-032-3.
- Warry, John (1998). Warfare in the Classical World. Barnes & Noble. ISBN 978-0-7607-1696-0.
- Welman, Nick. "Major Battles".
- Welman, Nick. "About Alexander's Army".
|Wikimedia Commons has media related to Battle of Gaugamela.|
- Livius.org tells the story of Alexander and quotes original sources. Favors a reconstruction of the battle which heavily privileges the Babylonian astronomical diaries.
- on YouTube History Channel
- Livius.org provides a new scholarly edition of the Babylonian Astronomical Diary concerning the battle of Gaugamela and Alexander's entry into Babylon by R.J. van der Spek.