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Battle of Gaugamela

Alexander breaks the Persian Empire — an oblique advance opens a gap, and a cavalry wedge drives straight at Darius (331 BCE).

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Phase by phase

1. Deployment at dawn · morning
   Darius III
   Two lines face off on the cleared plain
   At dawn the armies form up facing each other on ground Darius has levelled for his chariots and cavalry. The Persian line, far longer, stretches across the plain: Darius in the center with the Immortals and Indian horse, Bessus's Bactrians and Scythians on the left, Mazaeus's Syrian and Armenian horse on the right, with scythed chariots and elephants in front. Alexander faces them with the phalanx in the center, Companion cavalry on his right, and Parmenion holding the left, angled infantry guarding both flanks against envelopment.
   Prepared plain in the Nineveh Plains east of Mosul (Gaugamela/Arbela) · reconstructed · Arrian III.11-12; en.wikipedia.org/wiki/Battle_of_Gaugamela (deployment); worldhistory.org/Battle_of_Gaugamela
2. Oblique march to the right · morning
   Alexander the Great
   Alexander edges his whole army rightwardMacedon (Alexander)
   Rather than charge head-on, Alexander advances obliquely toward his right, sidestepping the army eastward along the Persian front. The move threatens to carry the fighting off the ground Darius has cleared and levelled for his chariots, and forces the Persian left to shift left with him to avoid being outflanked, stretching and thinning Darius's line.
   Along the Persian front, drifting east off the cleared ground · reconstructed · Arrian III.13; Britannica 'Battle of Gaugamela'; interessia/worldhistory phase summaries
3. Cavalry battle on the Persian left · midday
   Bessus's horsemen try to envelop the Macedonian rightPersia (Darius III)
   To stop Alexander's drift and turn his flank, Darius sends Bessus's Bactrian, Scythian and Arachosian cavalry sweeping around the Macedonian right. A hard, swirling cavalry fight develops on the wing. Alexander feeds in his flank guard and mercenary horse to hold the line and buy time, refusing to be drawn out of position while the gap he wants begins to form.
   Persian left / Macedonian right wing · reconstructed · Arrian III.13; en.wikipedia.org/wiki/Battle_of_Gaugamela (Bessus, left wing); livius.org gaugamela-331-bce
4. Scythed chariot charge repulsed · midday
   The scythed chariots break harmlessly throughPersia (Darius III)
   Darius launches his scythed chariots at the Macedonian center. Alexander's light troops shower the drivers and horses, and the phalanx simply opens lanes in its ranks, letting the chariots pass through to be dealt with in the rear. The weapon Darius had cleared the ground for achieves almost nothing.
   Center, in front of the Macedonian phalanx · reconstructed · Arrian III.13; en.wikipedia.org/wiki/Battle_of_Gaugamela (scythed chariots); worldhistory.org/Battle_of_Gaugamela
5. The gap opens · afternoon
   Alexander the Great
   A gap tears open in the Persian line
   As the Persian left streams away after Alexander and its cavalry is drawn into the flank fight, a gap opens in Darius's line to the left of his own center. Alexander, watching for exactly this, halts his oblique drift and prepares to strike inward toward the opening and the king behind it.
   Left-center of the Persian line · reconstructed · Arrian III.14; Britannica; en.wikipedia.org/wiki/Battle_of_Gaugamela (gap in the line)
6. Companion wedge charge at Darius · afternoon
   Alexander the Great
   Alexander drives the wedge at the kingMacedon (Alexander)
   Alexander forms his Companion cavalry, hypaspists and the nearest phalanx battalions into a giant wedge and wheels left into the gap, smashing toward Darius's own position. Cutting through the weakened center, he drives straight for the king.
   Through the gap into the Persian center · reconstructed · Arrian III.14; en.wikipedia.org/wiki/Battle_of_Gaugamela (wedge, Companion cavalry, hypaspists); worldhistory.org
7. Darius flees · afternoon
   Darius III
   Darius turns and runsPersia (Darius III)
   With the wedge bearing down and his center collapsing, Darius loses his nerve and is the first to turn and flee, driving his chariot back off the field. Seeing their king run, the Persian troops around the center begin to break.
   Persian center, then eastward/rearward off the field · reconstructed · Arrian III.14 (Darius first to flee); en.wikipedia.org/wiki/Battle_of_Gaugamela; livius.org gaugamela-331-bce
8. Breakthrough to the baggage camp · afternoon
   Persian horse punch through to the campPersia (Darius III)
   As Alexander's wedge pulls the right forward, a gap opens in the Macedonian line where a hard-pressed phalanx brigade cannot keep up. Persian and Indian cavalry ride clean through it and on to the Macedonian baggage camp in the rear, where Darius's captured family is held — but they stop to plunder. The Macedonian second line turns about and cuts them down from behind.
   Through the Macedonian center to the rear baggage camp · reconstructed · Arrian III.14; en.wikipedia.org/wiki/Battle_of_Gaugamela (Simmias hard-pressed, breakthrough to camp); britannica.com
9. Crisis on Parmenion's left · afternoon
   Mazaeus
   Parmenion holds the hard-pressed left
   On the far left Parmenion's Thessalian and Greek horse are heavily pressed by Mazaeus's cavalry and in danger of being enveloped. Parmenion sends urgent riders to Alexander for help. Alexander breaks off his pursuit of Darius, turns back, and in a fierce fight helps drive off the Persian and Indian cavalry streaming back from the camp; Mazaeus's attack finally slackens and the left is saved.
   Macedonian far left wing · reconstructed · Arrian III.15; en.wikipedia.org/wiki/Battle_of_Gaugamela (Parmenion's messages, Mazaeus right wing); worldhistory.org; livius.org
10. Persian collapse · late afternoon
    The Achaemenid line breaks apartPersia (Darius III)
    With the king gone, the center broken, and the flank attacks beaten off, the whole Persian army disintegrates. The right under Mazaeus, learning of Darius's flight, gives way too, and the survivors stream off the field in a general rout toward the mountains and Arbela.
    Across the plain, breaking northeast/east · reconstructed · Arrian III.15; en.wikipedia.org/wiki/Battle_of_Gaugamela; diodorus XVII.60-61
11. Pursuit toward Arbela · evening
    Alexander the Great
    Alexander pursues toward ArbelaMacedon (Alexander)
    Once the left is secure, Alexander regroups and rides in pursuit of Darius, pushing east toward Arbela through the night. Darius escapes into the mountains with a remnant, but his empire is broken: Babylon, Susa and the Persian heartland now lie open to Alexander.
    Eastward from the battlefield toward Arbela (Erbil) · reconstructed · Arrian III.15 (pursuit to Arbela); en.wikipedia.org/wiki/Battle_of_Gaugamela; britannica.com

Sources

• https://en.wikipedia.org/wiki/Battle_of_Gaugamela
• https://en.wikipedia.org/api/rest_v1/page/summary/Battle_of_Gaugamela
• https://www.worldhistory.org/Battle_of_Gaugamela/
• https://www.livius.org/articles/battle/gaugamela-331-bce/
• https://www.britannica.com/event/Battle-of-Gaugamela
• Arrian, Anabasis of Alexander III.11-15
• Quintus Curtius Rufus, Historiae Alexandri Magni IV.13-16
• Diodorus Siculus, Bibliotheca Historica XVII.56-61

On the data

The precise battlefield location is disputed: candidate sites (Tel Gomel, Karamlesh, Qaraqosh, Tell Aswad, a mound south of Wardak) all lie in the Nineveh Plains east of Mosul and west of Erbil. The Wikipedia infobox gives 36.56N, 43.44E; the seed anchor is [43.25, 36.36] (lon,lat), slightly SW of that but inside the same disputed zone — all phase coordinates are placed within ~0.1 degree of the anchor and are illustrative, NOT surveyed troop positions. The broad tactical sequence (oblique right march, chariot repulse, the gap and Companion wedge charge at Darius, Darius's flight, the Persian breakthrough to the baggage camp, Parmenion's hard-pressed left under Mazaeus, and the pursuit to Arbela) is agreed across Arrian, Curtius and Diodorus, so it is tagged documented at the event level. However, the ancient sources themselves lack fine-grained detail (Livius: 'what actually happened lies concealed for ever in the dust clouds'), and exact per-phase map positions, timings, and unit frontages are interpretive reconstructions — hence every phase is tagged fidelity=reconstructed. Army sizes are heavily debated (Persian figures in the sources — up to a million — are rejected by modern historians; realistic estimates run to perhaps ~50,000-120,000 Persians vs ~47,000 Macedonians) and are not encoded as coordinates. Leads are given only where a genuine, correctly-identified portrait exists on Wikipedia: Alexander (Q8409, Alexander Mosaic detail), Darius III (Q102865, Darius III mosaic) and Mazaeus (Q561959, his own coin). Parmenion (Q296233) has no portrait and Bessus's only image is a later Shahnama execution scene that does not portray him as a recognizable figure, so the lead is OMITTED on their phases rather than fabricated. Times are fractions of the single battle day (1 October 331 BC) used only for ordering; the sources do not give clock times.

Hand-authored from the sources below. Spotted a mistake? Email [email protected].