This battle began in Ionia on the coast of Anatolia. The Greeks had been settled there, but the Persian conquered this area. The Ionian Greeks then revolted and Athens went to help. They sent soldiers and ships to help the Ionian Greeks in the battle. A Persian fleet carrying 25,000 men sailed across the Agean Sea to a place called Marathon to battle the Greeks. The Athenians were badly outnumbered, with only 10,000 men, but were arranged in neat phalanxes. Even though they were outnumbered, through their great strategy and phalanxes, the Greeks were able to defeat the Persians, and only have fewer than 200 casualties, as opposed to the Persians, who had more than 6,000 casualties.