An outnumbered victory
In September 490 BC, a Persian expeditionary fleet under Datis and Artaphernes, sent by King Darius I in retaliation for Athenian support of an earlier Ionian revolt, landed at Marathon after sacking the city of Eretria. Before the battle, the runner Pheidippides was dispatched to Sparta requesting military aid, covering roughly two hundred and forty kilometres in two days, though Spartan reinforcements delayed their departure for religious reasons and arrived only after the fighting was over. The Athenian general Miltiades commanded a Greek force of some nine to eleven thousand hoplites, including a contingent from Plataea, against a Persian army modern historians estimate at around twenty-five thousand infantry with additional cavalry, having blocked the plain’s exits for several days before the two sides finally engaged. Herodotus reports one hundred and ninety-two Athenians killed against six thousand four hundred Persian dead counted on the field, an outcome that ended the first Persian invasion of mainland Greece.
The first historian’s account
The battle’s account rests almost entirely on Herodotus, writing roughly fifty to sixty years after the event in a genuinely novel undertaking, tracing the causes of a conflict through investigation and testimony rather than simply retelling inherited myth, which makes him effectively the first historian in the modern sense of the word. Ancient critics including Plutarch accused him of insufficient patriotism toward the Greek cause, while Thucydides, working within a generation of him, nonetheless chose to begin his own history where Herodotus left off, a decision modern scholars read as an implicit vote of confidence in his basic reliability. Archaeological findings, including artefacts and the physical terrain itself, have repeatedly corroborated details in his account, and modern historians generally trust his broad narrative while treating his specific numbers, especially troop counts and casualty figures, with real scepticism, since ancient writers routinely lacked reliable methods for counting armies and had every incentive to inflate the size of a defeated enemy.
A tactic born of genius or necessity
The Athenians appear to have attacked when they did because some meaningful change in the Persian position, most likely the departure of Persian cavalry to be re-embarked for a separate strike further along the coast toward Athens itself, removed an advantage that had kept the Greeks pinned defensively for several days beforehand. Miltiades’s unusual tactical arrangement, a deliberately thinned centre flanked by reinforced wings that let the Greek line match the wider Persian front without being outflanked, produced a double envelopment sophisticated enough that some modern commentators doubt Greek forces of this period actually possessed the training needed to execute it deliberately, suggesting it may equally have resulted from practical necessity as from calculated genius. Once the wings closed in on the retreating Persian centre, the heavier armour and closer formation of Greek hoplites gave a decisive advantage over more lightly equipped Persian infantry in exactly the kind of close, sustained melee that hoplite tactics were specifically designed to win.
Disputed timing and toll
Historians disagree on why the Athenians finally attacked when they did, with one theory crediting a Persian cavalry withdrawal that removed the threat holding Greek forces back and a rival theory instead crediting Persian infantry movement as the trigger that forced a Greek response, a distinction that changes which side should be credited with initiating the decisive engagement. The unusually thin Greek centre is similarly disputed as either deliberate tactical innovation, comparable to formations not otherwise documented until the fourth century, or a more mundane consequence of simply needing to match Persian battle-line length with a smaller force. Casualty figures inherited from Herodotus, one hundred and ninety-two Athenian dead against several thousand Persian, are treated by modern historians as broadly indicative rather than precise, and some scholars suggest actual Athenian losses may have reached one to two thousand once wounded and less prominent casualties are properly accounted for, a notably higher figure than the traditional count implies.
A legend Herodotus never told
Beyond ending the immediate Persian invasion, the victory demonstrated for the first time that Persian forces were not invincible in open battle, a psychological shift that historians credit with helping sustain Greek resistance through the far larger Persian invasion a decade later. The battle also generated one of history’s most durable legends, since Herodotus’s own account describes only Pheidippides’s earlier run to Sparta and says nothing of any messenger running from the battlefield to Athens afterward; that separate story, of a runner announcing victory before collapsing and dying, appears only centuries later in the writer Lucian, and the two originally distinct tales were fused by later authors, most influentially the poet Robert Browning in 1879, into the single composite legend that eventually inspired the modern Olympic marathon race when Michel Breal proposed the event for the 1896 Athens games. The philosopher John Stuart Mill later called the battle more important than the Battle of Hastings, even to British history.
History more interesting than its myth
Marathon rewards attention as a case where the least reliable part of a well-documented ancient event, the famous dying runner, turns out to be almost entirely fictional, assembled from separate stories centuries after the actual battle by writers who never claimed to be reporting fact. The genuine history underneath, a heavily outnumbered force winning through disciplined tactics and Persian miscalculation, is arguably more interesting than the legend it eventually generated, and readers should feel free to enjoy the marathon myth as a good story while keeping clear that Herodotus himself never told it. Anyone interested in the origins of Western historical writing, in how ancient numerical claims should be weighed against physical and logistical plausibility, or in tracing a modern Olympic tradition back to its genuinely confused literary origins will find this a rewarding and unusually well-documented ancient battle to study closely. Those wanting Herodotus’s specific numbers taken at face value should apply real caution instead.