Answer:
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
