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BATTLE // -330 BCE

Battle of Gaugamela

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Overview

The Battle of Gaugamela, also called the Battle of Arbela, 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.

Overview adapted from Wikipedia, licensed under CC BY-SA 4.0.

Significance

The Battle of Gaugamela was the second and final engagement between Alexander the Great and Darius III, and is considered the decisive blow that ended the Achaemenid Empire. Where the first meeting between the two kings had failed to resolve the conflict, Gaugamela proved conclusive: the scale of the Achaemenid collapse that followed resulted in the complete conquest of the empire by Macedon. The disparity in casualties — Macedonian losses recorded at between 1,100 and 1,500 against Achaemenid losses estimated at between 40,000 and 90,000 — reflects the totality of the Macedonian victory over a Persian force that, at its upper estimate, outnumbered Alexander's army by more than five to one. The battle was fought with commanders on both sides of considerable standing: alongside Alexander, Hephaestion, Parmenion, Coenus, and others led Macedonian formations, while Darius was supported by Bessus and Mazaeus. The outcome ended organized Achaemenid resistance and brought to a close the central strategic objective of Alexander's eastern campaigns.

Forces & casualties

Troop strength

  • Macedonia47,000
    medium
  • Achaemenid Empire50,000–250,000
    medium

Achaemenid Empire fielded a 3.2 : 1 numerical advantage

Casualties

  • Macedonia1,100–1,500
    medium3% loss rate
  • Achaemenid Empire40,000–90,000
    medium43% loss rate

Commanders (10)

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6 sibling battles · 0 factions

Last verified July 2026
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