By 481 [[BC]], A large Persian force (described as five million by [[Herodotus]], but estimates range from this figure to as low as 250,000, which is still a substantial size) had been assembled to march along the northern coast of the Aegean into Greece. This was disturbing to the Greek city states, who convened at the [[Isthmus of Corinth]] to discuss the threat caused by the Persians. | By 481 [[BC]], A large Persian force (described as five million by [[Herodotus]], but estimates range from this figure to as low as 250,000, which is still a substantial size) had been assembled to march along the northern coast of the Aegean into Greece. This was disturbing to the Greek city states, who convened at the [[Isthmus of Corinth]] to discuss the threat caused by the Persians. |