ORDER OF BATTLE // -30 BCE
Battle of Actium
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
2 sides catalogued · combined 36,000–86,000 estimated
Octavian
16,000
Medium-confidence figure
Antony
20,000–70,000
Medium-confidence figure
Battle context
The Battle of Actium, fought on 2 September 31 BC in the Ionian Sea near the former Roman colony of Actium, Greece, was the decisive engagement of the Final War of the Roman Republic and the climax of more than a decade of rivalry between Octavian and Mark Antony. The engagement pitted Octavian's fleet, under the operational command of Marcus Agrippa, against the combined naval forces of Mark Antony and Cleopatra. Octavian's force of 16,000 faced an opposing strength estimated between 20,000 and 70,000, yet Roman casualties for Octavian stood at 2,500 against 5,000 for Antony, indicating a clear operational victory. The outcome effectively ended Antony's capacity to contest control of the Roman world, leading directly to the consolidation of power under Octavian that defined the transition from republic to empire.
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