A Fleet Built for a Moment
In 480 BC the Persian king Xerxes led a very large army and fleet against Greece. The sea battle at Salamis, fought in late summer of that year, did not end the invasion by itself, but it removed the Persians’ ability to dominate the waters around Athens and made the campaign far harder to sustain. Most of what we know comes from the Greek historian Herodotus, writing a generation later, and from the playwright Aeschylus, who is said to have fought in the war and whose play The Persians was staged in 472 BC. Both are valuable, and both have gaps, so details below are those historians generally accept.
The Ships Themselves
The warship of both sides was the trireme, a slim oared vessel with rowers arranged in three levels. Its crew is traditionally put at around 170 rowers plus officers, deck hands and a few fighting men, though the exact figures are debated. Its main weapon was a bronze-sheathed ram at the waterline. A good captain tried to strike an enemy ship from the side or rear, or to shear off its oars, rather than board it. The finer points of trireme design, such as the exact oar layout, are still argued over by scholars, but the key point here is that these ships were fast and agile and not built for rough open water or long stays at sea.
That fragility mattered. Triremes were generally beached at night, and crews depended on coastal supply. Fighting near home shores favoured the defenders.
The Road to the Strait
Athens had reportedly used the revenue from a rich vein of silver to build a large fleet in the years before the invasion, a policy associated with the statesman Themistocles. When the Persian army advanced into central Greece, the Greeks tried to hold a land position at Thermopylae while their ships fought at Artemisium. The land position was turned, and Athens was evacuated, mostly to nearby islands and the Peloponnese. The Persians then occupied and burned the city.
The Greek allied fleet gathered at Salamis, an island close to the Attic coast. Its nominal commander was a Spartan, Eurybiades, though Themistocles is generally credited with the strategic argument. Many Peloponnesian commanders wanted to fall back to the Isthmus of Corinth, nearer their own homes. Themistocles argued that a fight in the cramped waters at Salamis offered the best chance to offset enemy numbers.
Why the Narrows Mattered
Ancient numbers for the Persian fleet are notoriously inflated. Herodotus gives figures that modern historians treat with great caution, though the Persian fleet was certainly larger than the Greek one, which Herodotus puts at a little under 400 ships. The Persian navy was a composite force, with Phoenician, Egyptian and Ionian Greek contingents among others. The Phoenicians, whose Phoenician harbours at Tyre and Sidon were busy centres of seafaring, were regarded as its most skilled seamen.
Numbers count for less in a confined strait. A larger fleet has to pass through a narrow space in a disordered column, where its ships can obstruct one another and cannot bring their full strength to bear. Herodotus describes the Persian ships crowding into the channel and fouling each other’s oars as the Greek line pressed forward, and the broad outline is widely accepted even if the particulars are not.
Herodotus also tells how Themistocles sent a message to Xerxes, appearing to offer treachery, which encouraged the king to attack instead of waiting. Whether the episode happened exactly that way is uncertain. It is best read as a plausible story about deception rather than as established fact.
The Fighting
The battle probably began at dawn, with the Greeks forming up as the Persian fleet advanced into the channel. Herodotus reports that Xerxes watched from a throne on the shore. The Greeks backed water at first and then attacked, and the Persian formation lost cohesion. The result was a heavy defeat for the invaders, with many ships lost to ramming and many crews killed as they tried to reach the shore. The Greek losses were considerably lighter. The exact casualty counts are not reliably known.
What Followed
Xerxes soon withdrew with a large part of his army, leaving a force under Mardonius in Greece. That force was defeated by the Greeks at Plataea in 479 BC, and the Persian fleet was also beaten around the same time near Mycale on the coast of Asia Minor. The invasion had failed.
The longer consequences are debated but important. Athens emerged with a large, experienced navy and a growing reputation, and its leadership of the naval alliance that followed became the foundation of its later power in the Aegean. The battle is a clear early case of geography beating raw numbers, and it remains a standard example when historians discuss how sea power shaped the ancient world, a theme that runs through the wider story of Mediterranean seafaring.
Reading the Evidence
Salamis is a reminder that ancient battle narratives are partly reconstructed. The precise position of the fleets, the time of day and the size of each side are all argued over. What is secure is the broad pattern: a defensive Greek fleet fought in confined waters near its home shore and defeated a larger, more varied force, with lasting political results for both sides.