Answer:
The invasion, consisting of two distinct campaigns, was ordered by the Persian king Darius the Great primarily in order to punish the city-states of Athens and Eretria. These cities had supported the cities of Ionia during their revolt against Persian rule, thus incurring the wrath of Darius.
Result: Persian victory in Thrace and Macedon; ...
Territorial changes: Persia conquers Macedon ...
Date: 492 – 490 BC
Location: Thrace, Macedon, Cyclades, Euboea, ...
Explanation: