Athens beat Persia at Marathon without Sparta's help
In 490 BC Athenian and Plataean hoplites smashed a Persian landing force under Datis and Artaphernes. The victory proved the empire could be stopped—and that Greece's second city could win a decisive battle while Sparta was still on the road.
Marathon capped Darius I's first attempt to punish Greece after Athens and Eretria backed the Ionian Revolt, even burning Sardis before Persian counterattacks drove them home. Once Persia crushed the revolt at Lade in 494 BC, Darius planned subjugation. An earlier probe under Mardonius in 492 BC retook Thrace and tightened control over Macedonia, which had been a Persian vassal since the late sixth century. In 490 a naval task force crossed the Aegean; Athens and Plataea met it on ground chosen so marshes and mountainous terrain kept Persian cavalry from joining the infantry fight.
General Miltiades ordered a full assault on missile-heavy Persian lines, strengthening his flanks so the center could envelop the enemy. The Greeks won. Contemporaries saw a watershed in the Greco-Persian wars: Persia was beatable on land, and Sparta—still regarded as Greece's premier land power—was not required for every decisive victory. That psychological shift helped seed later triumphs that preserved Greek independence.
Politics before the landing were tangled. Athens had expelled tyrant Hippias in 510 BC with help from Spartan king Cleomenes I; Hippias fled to the Persian court at Sardis after his family had ruled much of the prior half-century. Athenian democrats briefly sought Persian friendship, then sent twenty-five triremes to aid Ionia. Burning Sardis made Darius unforgetful. Marathon thus sits at the hinge of democratic Athens, Ionian revolt, and imperial retaliation—a single plain that rewrote what Greek cities thought possible.
Source: Battle of Marathon
