Long ago, two groups fought. 
Long ago, a very big empire fought small cities. 

Long ago, a huge empire fought many Greek cities. This was the Achaemenid Empire. It was ruled by Persian kings.
The trouble began in Ionia. Ionia was a place where Greeks lived. The Persians wanted to rule these cities. They put leaders in charge to control them. In 499 BC, the Greeks in Ionia fought back. This was called the Ionian Revolt. 
During this fight, Greeks burned a Persian city called Sardis. King Darius the Great wanted revenge. He sent his army to attack Greece. In 490 BC, the Greeks won a big battle at Marathon. 
Later, King Xerxes led a much larger army. The Persians took much of Greece. They even burned the city of Athens. But the Greeks fought back. They won a great sea battle at Salamis. 
Finally, the Greeks won at Plataea. This ended the Persian invasion. The Greek cities stayed free. A group called the Delian League helped keep them safe. 
The Greco-Persian Wars were a series of big fights between the Achaemenid Empire and many Greek city-states. These wars began in 499 BC and lasted until 449 BC. The Persian Empire was a huge and powerful land. On the other side, the Greeks lived in many small, independent cities. The trouble started when the Persian leader Cyrus the Great conquered Ionia in 547 BC. Ionia was a region where Greek people lived. To keep control, the Persians put certain leaders, called tyrants, in charge of the cities.
The conflict grew when a leader in Miletus named Aristagoras started a rebellion. This was called the Ionian Revolt. In 498 BC, Greek forces from Athens and Eretria helped capture and burn the Persian city of Sardis. This act made the Persian king, Darius the Great, very angry. He wanted to punish the Greeks for what they did. The Persians eventually crushed the revolt in 494 BC at the Battle of Lade. After this, Darius planned to invade Greece to protect his empire and get revenge. 
In 490 BC, a Persian force tried to attack Athens. They first took the city of Eretria. However, the Athenians defeated the Persians at the Battle of Marathon. This stopped the Persians for a short time. Later, Darius's son, Xerxes, took over. In 480 BC, Xerxes led a massive army into Greece. The Persians won at the Battle of Thermopylae and burned the city of Athens. But the Greeks fought back on the sea. They won a major victory at the Battle of Salamis. 
The Greeks continued to fight and won a big victory at the Battle of Plataea. This ended the Persian invasion of Greece. After the Persians left, the Greek cities in Ionia became free again. A group of Greek cities formed the Delian League to stay safe. This league fought against Persia for many years. They won a big victory at the Battle of the Eurymedon in 466 BC. Eventually, the wars came to a quiet end around 451 BC. 
We know about these wars thanks to writers from a long time ago. The most famous writer was Herodotus. He is often called the "Father of History." He lived around 484 BC and wrote his stories to explain why the wars happened. Other writers like Thucydides and Plutarch also wrote about these events. Today, archaeologists find real things like Persian arrowheads to help prove these stories are true. These finds help us see how these ancient people lived and fought. 
The Greco-Persian Wars were a series of massive military conflicts. They involved the Achaemenid Empire and various Greek city-states. These wars lasted from 499 BC until 449 BC. The conflict was a collision between two very different worlds. The Persians managed a massive, unified empire. In contrast, the Greeks lived in many small, independent cities.
The roots of the war began in 547 BC. During this time, Cyrus the Great conquered Ionia. Ionia was a region in Asia Minor inhabited by Greeks. To maintain control, the Persians appointed tyrants to rule these cities. This political setup caused great tension. In 499 BC, a leader named Aristagoras started the Ionian Revolt. He incited the cities of Hellenic Asia Minor to rebel against Persian rule. Athens and Eretria sent military support to help the rebels. In 498 BC, these forces captured and burned the Persian capital of Sardis. 
King Darius the Great sought revenge for the destruction of Sardis. The Ionian Revolt continued with a stalemate for several years. However, the Persians regrouped and attacked Miletus in 494 BC. The Ionians suffered a decisive defeat at the Battle of Lade. This caused the rebellion to collapse completely. Darius then planned to conquer mainland Greece. He wanted to secure his empire from future revolts. He also wanted to punish Athens and Eretria for their interference. 
The first Persian invasion began in 492 BC. The general Mardonius successfully re-subjugated Thrace and Macedon. However, various mishaps ended this campaign early. In 490 BC, a second force arrived via the Aegean Sea. Commanders Datis and Artaphernes led this expedition. They captured and razed the city of Eretria. When they moved to attack Athens, they met the Athenian army. The Persians were decisively defeated at the Battle of Marathon. This event temporarily halted Persian expansion into Greece. 
After Darius died in 486 BC, his son Xerxes took command. Xerxes led a massive second invasion in 480 BC. He assembled one of the largest ancient armies ever seen. The Persians won at the Battle of Thermopylae. This victory allowed them to overrun much of Greece. They even burned the evacuated city of Athens. However, the Persian momentum shifted at sea. The Greeks won a severe victory at the Battle of Salamis. 
The Greeks then went on the offensive. They achieved a decisive victory at the Battle of Plataea. This victory ended the Achaemenid invasion of Greece. The Greeks also destroyed the Persian fleet at the Battle of Mycale. Following these wins, Ionia and Macedon regained their independence. To stay safe, many Greeks formed the Delian League. This was a confederation led by Athens. They campaigned against Persia for thirty more years. They won a major victory at the Battle of the Eurymedon in 466 BC. 
We learn about these events through ancient historians. Herodotus is the most important source. He was born in 484 BC in Halicarnassus. He is often called the "Father of History." He wrote his "Histories" to trace the origins of the wars. He tried to use explanations he could personally verify. Later, the historian Thucydides also wrote about this era. He is considered a very reliable primary account. Archaeologists have found physical evidence of the wars too. For example, they found Persian arrowheads at Thermopylae. 
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