The Battle of Salamis ( SAL-ə-miss) was a naval battle fought in 480 BC, between an alliance of Greek city-states under Themistocles, and the Achaemenid Empire under King Xerxes. It resulted in a victory for the outnumbered Greeks.
The battle was fought in the straits between the mainland and Salamis, an island in the Saronic Gulf near Athens, and marked the high point of the second Persian invasion of Greece. It was arguably the largest naval battle of the ancient world, and marked a turning point in the invasion.
To block the Persian advance, a small force of Greeks blocked the pass of Thermopylae, while an Athenian-dominated allied navy engaged the Persian fleet in the nearby straits of Artemisium. In the resulting Battle of Thermopylae, the Spartan rearguard of the Greek force was annihilated, while in the Battle of Artemisium the Greeks suffered heavy losses and retreated after the loss at Thermopylae. This allowed the Persians to conquer Phocis, Boeotia, Attica and Euboea. The allies prepared to defend the Isthmus of Corinth while the fleet was withdrawn to nearby Salamis Island.
Although heavily outnumbered, the Greeks were persuaded by Athenian general Themistocles to bring the Persian fleet to battle again, in the hope that a victory would prevent naval operations against the Peloponnese. Persian king Xerxes was also eager for a decisive battle. As a result of subterfuge on the part of Themistocles (which included a message directly sent to Xerxes letting him know that much of the Greek fleet was stationed at Salamis), the Persian navy rowed into the Straits of Salamis and tried to block both entrances. In the cramped waters, the great Persian numbers were an active hindrance, as ships struggled to maneuver and became disorganized. Seizing the opportunity, the Greek fleet formed in line and achieved a victory.
Xerxes retreated to Asia with much of his army, leaving Mardonius to complete the conquest of Greece. The following year the remainder of the Persian army was defeated at the Battle of Plataea and the Persian navy at the Battle of Mycale. The Persians made no further attempts to conquer the Greek mainland. The battles of Salamis and Plataea thus mark a turning point in the course of the Greco-Persian Wars as a whole; from then onward, the Greek poleis would take the offensive.
Background
The Greek city-states of Athens and Eretria had supported the unsuccessful Ionian Revolt against the Persian Empire of Darius I in 499-494 BC, led by the satrap of Miletus, Aristagoras. The Persian Empire was still relatively young, and prone to revolts amongst its subject peoples. Moreover, Darius was a usurper, and had spent considerable time extinguishing revolts against his rule. The Ionian revolt threatened the integrity of his empire, and Darius thus vowed to punish those involved (especially those not already part of the empire). Darius also saw the opportunity to expand his empire into the fractious world of Ancient Greece. A preliminary expedition under Mardonius, in 492 BC, to secure the land approaches to Greece ended with the conquest of Thrace and forced Macedon to become a client kingdom of Persia.
In 491 BC, Darius sent emissaries to all the Greek city-states, asking for a gift of 'earth and water' in token of their submission to him. Having had a demonstration of his power the previous year, the majority of the Greek cities duly obliged. In Athens, however, the ambassadors were put on trial and then executed; in Sparta, they were simply thrown down a well. This meant that Sparta was also now effectively at war with Persia.
Darius thus put together an amphibious task force under Datis and Artaphernes in 490 BC, which attacked Naxos, before receiving the submission of the other Cycladic Islands. The task force then moved on Eretria, which it besieged and destroyed. Finally, it moved to attack Athens, landing at the bay of Marathon, where it was met by a heavily outnumbered Athenian army. At the ensuing Battle of Marathon, the Athenians won a remarkable victory, which resulted in the withdrawal of the Persian army to Asia.
Darius therefore began raising a huge new army with which he meant to completely subjugate Greece; however, in 486 BC, his Egyptian subjects revolted, indefinitely postponing any Greek expedition. Darius then died whilst preparing to march on Egypt, and the throne of Persia passed to his son Xerxes I. Xerxes crushed the Egyptian revolt, and very quickly restarted the preparations for the invasion of Greece. Since this was to be a full-scale invasion, it required long-term planning, stock-piling and conscription. Xerxes decided that the Hellespont would be bridged to allow his army to cross to Europe, and that a canal should be dug across the isthmus of Mount Athos (rounding which headland, a Persian fleet had been destroyed in 492 BC). These were both feats of exceptional ambition, which would have been beyond any other contemporary state. By early 480 BC, the preparations were complete, and the army which Xerxes had mustered at Sardis marched towards Europe, crossing the Hellespont on two pontoon bridges.
The Athenians had also been preparing for war with the Persians since the mid-480s BC, and in 482 BC the decision was taken, under the guidance of the Athenian politician Themistocles, to build a massive fleet of triremes that would be necessary for the Greeks to fight the Persians. However, the Athenians did not have the manpower to fight on land and sea; and therefore combatting the Persians would require an alliance of Greek city states. In 481 BC, Xerxes sent ambassadors around Greece asking for earth and water, but made the very deliberate omission of Athens and Sparta. Support thus began to coalesce around these two leading states. A congress of city states met at Corinth in late autumn of 481 BC, and a confederate alliance of Greek city-states was formed. It had the power to send envoys asking for assistance and to dispatch troops from the member states to defensive points after joint consultation. This was remarkable for the disjointed Greek world, especially since many of the city-states in attendance were still technically at war with each other.
Initially the 'congress' agreed to defend the narrow Vale of Tempe, on the borders of Thessaly, and thereby block Xerxes's advance. However, once there, they were warned by Alexander I of Macedon that the vale could be bypassed through the pass by the modern village of Sarantaporo, and that the army of Xerxes was overwhelming, so the Greeks retreated. Shortly afterward, they received the news that Xerxes had crossed the Hellespont. A second strategy was therefore adopted by the allies. The route to southern Greece (Boeotia, Attica and the Peloponnese) would require the army of Xerxes to travel through the very narrow pass of Thermopylae. This could easily be blocked by the Greek hoplites, despite the overwhelming numbers of Persians. Furthermore, to prevent the Persians bypassing Thermopylae by sea, the Athenian and allied navies could block the straits of Artemisium. This dual strategy was adopted by the congress. However, the Peloponnesian cities made fall-back plans to defend the Isthmus of Corinth should it come to it, whilst the women and children of Athens had been evacuated en masse to the Peloponnesian city of Troezen.
Famously, the much smaller Greek army led by the Spartan king Leonidas held the pass of Thermopylae against the Persians for three days before being outflanked by a mountain path. Much of the Greek army retreated, before the Spartans and Thespians who had continued to block the pass were surrounded and killed. The simultaneous Battle of Artemisium was up to that point a stalemate; however, when news of Thermopylae reached them, the Allied fleet also retreated, since holding the straits of Artemisium was now a moot point.
Prelude
The Allied fleet now rowed from Artemisium to Salamis to assist with the final evacuation of Athens. En route Themistocles left inscriptions addressed to the Ionian Greek crews of the Persian fleet on all springs of water that they might stop at, asking them to defect to the Allied cause.
Men of Ionia, that what you are doing is not proper, campaigning against your fathers and wishing to enslave Greece. It would be best if you came on our side. But if this is not possible, at least during the battle stand aside and also beg the Carians to do the same with you. But if you can not do either the one or the other, if you are chained by higher force and you can not defect during the operations, when we come at hand, act purposely as cowards remembering that we are of the same blood and that the first cause of animosity with the barbarians came from you.
Following Thermopylae, the Persian army proceeded to burn and sack the Boeotian cities that had not surrendered - Plataea and Thespiae -before marching on the now evacuated city of Athens. The Allies (mostly Peloponnesian) prepared to defend the Isthmus of Corinth, demolishing the single road that led through it, and building a wall across it.
This strategy was flawed, however, unless the Allied fleet was able to prevent the Persian fleet from transporting troops across the Saronic Gulf. In a council-of-war called once the evacuation of Athens was complete, the Corinthian naval commander Adeimantus argued that the fleet should assemble off the coast of the Isthmus in order to achieve such a blockade. However, Themistocles argued in favour of an offensive strategy, aimed at decisively destroying the Persians' naval superiority. He drew on the lessons of Artemisium, pointing out that "battle in close conditions works to our advantage". He eventually won through, and the Allied navy remained off the coast of Salamis.
The timeline for Salamis is difficult to establish with any certainty. Herodotus presents the battle as though it occurred directly after the capture of Athens, but nowhere explicitly states as much. If Thermopylae/Artemisium occurred in September, then this may be the case, but it is probably more likely that the Persians spent two or three weeks capturing Athens, refitting the fleet, and resupplying. Clearly though, at some point after capturing Athens, Xerxes held a council of war with the Persian fleet; Herodotus says this occurred at Phalerum. Artemisia, queen of Halicarnassus and commander of its naval squadron in Xerxes's fleet, tried to convince him to wait for the Allies to surrender believing that battle in the straits of Salamis was an unnecessary risk. Nevertheless, Xerxes and his chief advisor Mardonius pressed for an attack.
It is difficult to explain exactly what eventually brought about the battle, assuming that neither side simply attacked without forethought. Clearly though, at some point just before the battle, new information began to reach Xerxes of rifts in the allied command; the Peloponnesians wished to evacuate from Salamis while they still could. This alleged rift amongst the Allies may have simply been a ruse, in order to lure the Persians to battle. Alternatively, this change in attitude amongst the Allies (who had waited patiently off the coast of Salamis for at least a week while Athens was captured) may have been in response to Persian offensive maneuvers. Possibly, a Persian army had been sent to march against the Isthmus in order to test the nerve of the fleet.
Either way, when Xerxes received this news, he ordered his fleet to go out on patrol off the coast of Salamis, blocking the southern exit. Then, at dusk, he ordered them to withdraw, possibly in order to tempt the Allies into a hasty evacuation. That evening Themistocles attempted what appears to have been a spectacularly successful use of disinformation. He sent a servant, Sicinnus, to Xerxes, with a message proclaiming that Themistocles was "on the king's side and prefers that your affairs prevail, not the Hellenes". Themistocles claimed that the Allied command was in-fighting, that the Peloponnesians were planning to evacuate that very night, and that to gain victory all the Persians needed to do was to block the straits. In performing this subterfuge, Themistocles seems to have been trying to bring about exactly the opposite; to lure the Persian fleet into the Straits. This was exactly the kind of news that Xerxes wanted to hear; that the Athenians might be willing to submit to him, and that he would be able to destroy the rest of the Allied fleet. Xerxes evidently took the bait, and the Persian fleet was sent out that evening to effect this block. Xerxes ordered a throne to be set up on the slopes of Mount Aigaleo (overlooking the straits), in order to watch the battle from a clear vantage point, and so as to record the names of commanders who performed particularly well.
According to Herodotus, the Allies spent the evening heatedly debating their course of action. The Peloponnesians were in favour of evacuating, and at this point, Themistocles attempted his ruse with Xerxes. It was only when Aristides, the exiled Athenian general arrived that night, followed by some deserters from the Persians, with news of the deployment of the Persian fleet, that the Peloponnesians accepted that they could not escape, and so would fight.
However, the Peloponnesians may have been party to Themistocles's stratagem, so serenely did they accept that they would now have to fight at Salamis. The Allied navy was thus able to prepare properly for battle the forthcoming day, whilst the Persians spent the night fruitlessly at sea, searching for the alleged Greek evacuation. The next morning, the Persians rowed into the straits to attack the Greek fleet; it is not clear when, why or how this decision was made, but it is clear that they did take the battle to the Allies.