After the Battle of Marathon, the Persian troops decided to set a course back to their home in Persia.
During the Battle of Marathon:
- The Persians fought the Athenians
- The Athenians crushed the Persians
- The Persians retreated to Asia
When the Persians saw that they were losing large numbers to the Athenians, they decided to postpone their invasion of Athens and instead sailed back to Asia which was under Persia.
In conclusion, the Persians set a course for Persia.
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