ORDER OF BATTLE // -279 BCE
Battle of Heraclea
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
2 sides catalogued · combined 77,400 estimated
Epirus
35,000
Medium-confidence figure
Roman Republic
42,400
Medium-confidence figure
Battle context
The Battle of Heraclea was the opening engagement of the Pyrrhic War, pitting the Roman forces under consul Publius Valerius Laevinus against a combined Greek army assembled by Pyrrhus of Epirus alongside contingents from Tarentum, Thurii, Metapontum, and Heraclea. Despite commanding a numerically smaller force of approximately 35,000 against the Roman force of some 42,400, Pyrrhus secured a victory. However, with Epirote casualties recorded at around 4,000 against Roman losses of roughly 7,000, the cost of the victory was substantial relative to the size of his expeditionary army. The engagement established the central dynamic of the Pyrrhic War: Pyrrhus could defeat Roman forces in the field but could not do so without attrition his army could ill afford, a pattern that would give the conflict — and the term 'Pyrrhic victory' — its lasting historical meaning.
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