Why did Darius send an expedition against Greece in 490 BC, and how and why did the Athenians win at Marathon?
The first Persian invasion and the Battle of Marathon 490 BC: Darius's punitive expedition, the fall of Eretria, the Athenian decision to fight, the role of Miltiades, the tactics and outcome of the battle, and its significance for Athenian self-image.
An OCR A-Level Ancient History period study guide to the first Persian invasion and the Battle of Marathon in 490 BC. Covers Darius's punitive expedition, the fall of Eretria, the Athenian decision to fight, the role of Miltiades, the hoplite tactics that won the battle, the part of Sparta and Plataea, and the battle's significance for Athens.
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What this dot point is asking
The first Persian invasion and the Battle of Marathon in 490 BC are the climax of the conflict's first phase. This page covers Darius's punitive expedition, the fall of Eretria, the Athenian decision to fight, the role of Miltiades, the tactics that won the battle, the contribution of Plataea and the absence of Sparta, and the battle's lasting significance for Athenian self-image. The topic rewards both a ranked explanation of the victory and a critical reading of Herodotus's patriotic narrative.
The answer
Darius's expedition and the fall of Eretria
The destruction of Eretria set the stakes: Athens faced the same fate, which sharpened the decision the city now had to make.
The Athenian decision and the role of Miltiades
Athens chose to march out to Marathon rather than wait behind its walls, helped only by a small force from Plataea. Sparta, asked for help, delayed (Herodotus says, for the Carneia festival) and arrived after the battle was over. The Athenian command rotated among the generals, but the decisive figure was Miltiades, who had served under the Persians and understood their army, and who pressed for an immediate attack.
The battle and its tactics
Herodotus gives the casualties as 6,400 Persians to 192 Athenians, a ratio that is patriotically lopsided and partly symbolic. The 192 Athenian dead were buried under a mound (the Soros) that still stands, a sign of how the battle entered Athenian memory.
The significance of Marathon
Marathon mattered out of proportion to its scale:
- It proved that Greek hoplites could defeat Persians, transforming Greek morale before the far larger invasion of 480 BC.
- It became a founding national myth for Athens, the citizen-soldiers (including, in tradition, the playwright Aeschylus) who saved the city, and the legendary run of the messenger to Athens.
- It bought a decade before Xerxes returned, time Athens used (under Themistocles) to build the fleet that would win at Salamis.
Examples in context
A model answer explains why the hoplites won rather than simply narrating the charge, and treats Herodotus's numbers as patriotic rather than precise.
Try this
Q1. Assess the significance of Marathon for Athens and for the wider Greek world. [20 marks, period essay style]
- What the marker wants. An AO1 and AO2 argument that Marathon proved Persians could be beaten, transformed Greek morale, became a founding Athenian myth, and bought time for rearmament, with a judgement on its overall importance balanced against the scale of the later invasion.
Q2. Which Greek city sent help to Athens at Marathon, and which did not arrive in time? [2 marks]
- Cue. Plataea sent a small contingent that fought alongside the Athenians; Sparta delayed (for the Carneia festival, Herodotus says) and arrived after the battle.
Exam-style practice questions
Practice questions written in the style of OCR exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
OCR H407/11 201820 marksAssess the reasons why the Athenians were able to defeat the Persians at Marathon in 490 BC. [shown at the 20-mark period essay cap]Show worked answer →
A Section A 20-mark period essay (AO1 and AO2). Rank the causes of the Athenian victory.
Factors. Miltiades's leadership and tactics (thinning the centre and strengthening the wings to envelop the Persians); the discipline and heavy armour of the hoplite phalanx against more lightly armed Persian infantry; the decision to attack before the Persian cavalry could be deployed; and Athenian morale and the help of the Plataeans.
Judgement. The strongest answers argue that hoplite quality plus Miltiades's tactical use of the ground and timing were decisive, while the absence of Persian cavalry from the decisive clash was a crucial enabling factor. The top level ranks and judges rather than narrating the battle.
OCR H407/11 202212 marksHow useful is Herodotus Book 6 for understanding the Battle of Marathon? [shown at the 12-mark source-utility cap]Show worked answer →
A Section A 12-mark source-utility question (AO3).
Value. Herodotus is the only full narrative, written within two generations, drawing on Athenian tradition, with detail on the tactics, the role of Miltiades and the run of the Athenian line.
Limitations. His account reflects a strongly pro-Athenian, even Athenocentric, tradition that magnifies the victory; the figures (especially Persian casualties of 6,400 against 192 Athenians) are suspiciously lopsided and partly patriotic; the role of the cavalry is unclear in his text.
Judgement. Indispensable as the main source and for Athenian self-image, but its patriotic shaping and round numbers must be treated critically. Top answers judge usefulness for the enquiry.
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Sources & how we know this
- OCR A Level Ancient History H407 specification — OCR (2017)
- Herodotus, Histories, Book 6 — Perseus Digital Library