stylistic:style_transfer, quality:corruption
Significance

The defeat at Marathon barely touched the vast resources of the Persian empire, yet for the Greeks it was an enormously significant victory. It was the first time the Greeks had beaten the Persians, proving that the Persians were not invincible, and that resistance, rather than subjugation, was possible.

The battle was a defining moment for the young Athenian democracy, showing what might be achieved through unity and self-belief; indeed, the battle effectively marks the start of a "golden age" for Athens. This was also applicable to Greece as a whole; "their victory endowed the Greeks with a faith in their destiny that was to endure for three centuries, during which Western culture was born". John Stuart Mill 's famous opinion was that "the Battle of Marathon, even as an event in British history, is more important than the Battle of Hastings ". According to Isaac Asimov, "if the Athenians had lost in Marathon,... Greece might have never gone to develop the peak of its civilization, a peak whose fruits we moderns have inherited."

It seems that the Athenian playwright Aeschylus considered his participation at Marathon to be his greatest achievement in life (rather than his plays) since on his gravestone there was the following epigram:

Αἰσχύλον Εὐφορίωνος Ἀθηναῖον τόδε κεύθει μνῆμα καταφθίμενον πυροφόροιο Γέλας· ἀλκὴν δ’ εὐδόκιμον Μαραθώνιον ἄλσος ἂν εἴποι καὶ βαθυχαιτήεις Μῆδος ἐπιστάμενος This tomb the dust of Aeschylus doth hide, Euphorion's son and fruitful Gela's pride. How tried his valor, Marathon may tell, And long-haired Medes, who knew it all too well.

Militarily, a major lesson for the Greeks was the potential of the hoplite phalanx. This style had developed during internecine warfare amongst the Greeks; since each city-state fought in the same way, the advantages and disadvantages of the hoplite phalanx had not been obvious. Marathon was the first time a phalanx faced more lightly armed troops, and revealed how effective the hoplites could be in battle. The phalanx formation was still vulnerable to cavalry (the cause of much caution by the Greek forces at the Battle of Plataea), but used in the right circumstances, it was now shown to be a potentially devastating weapon.