Greek city-states rebel against Persia with Athens help
The Greeks were tired of being ruled by the Persians. They revolted, and Darius, the Persian king at the time, was annoyed that they tried to intervene. That is when he decided to attack the Greeks on the mainland.
Battle of Marathon
This was result of the Greeks meddling in Darius' plans: The Persians waited at Marathon for many days. The Greeks never showed up due to their lack of soldiers. Finally, the Persians decided to go and attack Athens straight on. So, they began packing their things and THAT'S when Athens decided to attack them, when they were unarmed. The Persians lost, and vowed revenge.
Battle of Thermopylae
The Persians attacked the Greeks with approximately 200,000 troops and many supply vehicles. Persia fought Sparta's 7,000 soldiers for three days. After that, the Greeks knew they would be defeated at Thermopylae. A traitor showed the Persians how to attack the Greeks from behind, which then lead to a battle with them and 300 Spartans. The Spartans fought to death, and lost. After this, it was off to the Battle of Salamis, for the Greeks to redeem themselves.
Battle of Salamis
While the Spartans were off attacking the Persians, Themistocles carried out his plan. He led all of the big Persian ships down a strait with all of the small, fast Athenian ships. The big ships crowded in the strait making it hard to move them. However, the small boats were able maneuver easily because of their size and swiftness. The plan worked; they sunk approximately 300 of the Persian's ships, losing just about 40 of their own ships. This lead to the Battle of Platea.
Battle of Plataea
The Greek city-states combined to battle with the Persians. The sides were even, number wise.They each had about 100,000 men. The Greeks had trained for this and even got better armour and weapons. The Greeks won, and continued fighting for the freedom of the Anatolians.
The decline of Persia
After the wars, the Persian army became weak and the kings started heavily taxing their people to pay for luxuries. The empire became weaker and weaker and as it did, it became open to invaders. Alexander the Great and his army invaded Persia in 300 B.C. and the empire ended.