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How did the Greek city-states defeat the Persian Empire, and why did the wars matter so much for Greek identity?

Analyse the causes, course and consequences of the Greco-Persian Wars, 490-479 BCE

How the Greek city-states defeated Persia at Marathon, Thermopylae, Salamis and Plataea, and why the wars shaped Greek identity, covering causes, course and sources.

Generated by Claude Opus 4.87 min answerUpdated 2026-06-02

Reviewed by: AI editorial process; not yet individually human-reviewed

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What this dot point is asking

The wars grew out of the expansion of the Persian Empire under the Achaemenid kings. By the late sixth century BCE Persia controlled the Greek cities of Ionia on the coast of Asia Minor. When these cities rose in the Ionian Revolt (499 to 494 BCE), Athens and Eretria sent help, and the revolt was crushed, with Miletus sacked in 494 BCE. The Persian king Darius I then resolved to punish the mainland cities that had interfered. According to the historian Herodotus, our main source, Darius had a servant remind him daily to remember the Athenians.

The first invasion came in 490 BCE. A Persian force landed on the plain of Marathon in Attica. The Athenians, with a small contingent from Plataea and led by the general Miltiades, charged the larger Persian army and won a decisive victory. Herodotus reports around 6,400 Persian dead against 192 Athenians, figures that may be exaggerated but capture the scale of the upset. Marathon became central to Athenian pride and the legend of the runner who carried news of victory to Athens.

The second invasion, led by Darius's son Xerxes I in 480 BCE, was far larger. Herodotus gives wildly high numbers, but modern estimates suggest a Persian army of perhaps 100,000 or more, with a great fleet. A combined Greek force, organised through the Hellenic League and led on land by Sparta, made a famous stand at the pass of Thermopylae. King Leonidas and his 300 Spartans, with allies, held the pass for several days before being outflanked by a mountain path and destroyed. The delay was a moral victory, but Athens itself was captured and burned. The turning point came at sea: in the narrow straits of Salamis the Greek fleet, partly through the cunning of Themistocles, destroyed much of the Persian navy.

The following year, 479 BCE, the Greeks won the decisive land battle at Plataea under the Spartan regent Pausanias, and tradition links it with a naval victory at Mycale on the same day, which freed the Ionian cities. The Persian threat to the mainland was over. The consequences were enormous. The victory gave the Greeks, and especially Athens, a powerful sense of having defended freedom against tyranny, a theme repeated in art, drama and oratory. Athens used its fleet to lead the Delian League from 478 BCE, an alliance that gradually became an Athenian empire and funded the cultural golden age of the fifth century.

Structuring causes, course and consequences

A TASC answer on the Persian Wars should organise the material into the three parts the dot point names. Use this routine.

Step 1: Causes

Trace the chain: Persian expansion under the Achaemenids absorbed the Ionian Greek cities; the Ionian Revolt (499 to 494 BCE), helped by Athens and Eretria, was crushed; and Darius I resolved to punish the mainland cities that had interfered.

Step 2: Course

Sequence the key battles with dates: Marathon (490 BCE, Athenian victory under Miltiades); the second invasion under Xerxes in 480 BCE, with the stand at Thermopylae, the burning of Athens, and the decisive naval victory at Salamis; then Plataea on land and Mycale at sea in 479 BCE.

Step 3: Consequences

Explain the results: the Persian threat to the mainland ended, the Greeks gained a powerful sense of having defended freedom against tyranny, and Athens used its fleet to lead the Delian League from 478 BCE, which became an empire funding the cultural golden age.

Step 4: Weigh the evidence as you go

At each stage flag that Herodotus is the main source, invaluable but written a generation later with patriotic bias and inflated Persian numbers, and corroborate with Aeschylus, inscriptions and archaeology. This keeps the answer analytical rather than a retelling.

The evidence centres on Herodotus, writing a generation later, who is invaluable but mixes oral tradition, anecdote and patriotic bias, and who gives implausible Persian numbers. Other sources include the play The Persians by Aeschylus, who fought at Salamis, inscriptions, and archaeology of the battle sites. For a TASC response, treat Herodotus critically as a source whose reliability varies, and explain the wars as a turning point that both saved the independent city-states and set Athens on the path to empire.

Exam-style practice questions

Practice questions written in the style of TASC exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.

2023 TASC20 marks"The ancient past relies on the interpretation of evidence to provide understanding of an ancient site, significant event, development or an era." Describe and assess how the primary and secondary sources have contributed to the interpretation and understanding of the historical context and representations of one (1) ancient site, significant event, development or era that you have studied.

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Section A essay (Criteria 3, 4 and 5). The Greco-Persian Wars are ideal, because our understanding rests heavily on interpreting one main source, Herodotus, against other evidence.

Open with a thesis: our picture of the wars is an interpretation built from limited and partisan evidence, above all Herodotus, checked against drama, inscriptions and archaeology. Then organise the body around the kinds of evidence and what each contributes.

Describe and assess each: Herodotus, writing a generation later, gives the narrative but mixes oral tradition, anecdote and patriotic bias and gives implausible Persian numbers; Aeschylus' play The Persians is a contemporary Greek representation by a man who fought at Salamis; inscriptions and battle-site archaeology corroborate locations and scale. Conclude by judging how far the combined evidence supports a confident understanding, secure on the outcomes but contestable on numbers and motives.

2025 TASC18 marksAnalyse how historical context, as well as one (1) or more of the core elements, impacted at least one (1) key feature of an ancient society you have studied. Use both primary and secondary evidence to support your argument. Core elements: political, social, economic, cultural. Key features include arts and architecture, weapons and warfare, technology and engineering, women and family, and beliefs, rituals and funerary practices.

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Section B essay (Criteria 3, 4 and 6). The Persian Wars let you argue how historical context shaped the key feature of weapons and warfare, and of beliefs and identity, in the Greek world.

Set the historical context: the expansion of the Achaemenid empire, the Ionian Revolt, and the threat of invasion. Then argue the causal link. The need to face Persia shaped the key feature of warfare directly: Themistocles used the Laurion silver to build a fleet of around 200 triremes, turning Athens into a naval power, while the hoplite phalanx proved decisive on land at Marathon and Plataea.

Support with primary evidence (Herodotus on the wooden walls and the battles, Aeschylus' Persians) and assess its patriotic bias and inflated numbers. Conclude by judging how decisively the context of the Persian threat reshaped Greek warfare and the sense of Greek identity against the barbarian.