How did the Battle of Marathon affect Darius I’s plans for Greece?

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Darius the Great — Darius I This chromolithograph of a frieze at Susa depicts attendants serving Darius I.

The defeat at the Battle of Marathon in 490 BCE forced Darius I to reevaluate his approach to Greece. Previously, the Persians had likely viewed the Greek conflict as a minor issue on the western periphery of the empire. Following the loss, Darius recognized that subduing the Greeks would require a significantly more concerted and massive military effort.1

Consequently, Darius began preparations for a large-scale, coordinated invasion of Greece. However, these plans were ultimately interrupted in 486 BCE by the death of the king and a serious revolt in Egypt, leaving the task of a renewed invasion to his successor, Xerxes I.12