The Battle of Thermopylae of 480 BC has long been the topic of cultural inspiration, as it is perhaps the most famous military last stand of all time. This "against all odds" story is passed to us from the writings of the Greek Herodotus, who was not present at the battle himself. He relates the story of 300 Spartans and 700 Thespians defending the Pass of Thermopylae against almost "2 million" Persians on the third day of the battle. (For the first two days, the Greek force had numbered somewhere between 5,000 and 7,000.)
Although modern historians have questioned the numbers presented by Herodotus, with most at around 100,000 to 250,000 invaders, the story has resonated with authors and poets for centuries over the inspiring bravery and resolution of the Spartans.
The performance of the defenders at the battle of Thermopylae is often used as an example of the advantages of training, equipment, and good use of terrain to maximize an army's potential, and has become a symbol of courage against overwhelming odds. Even more, both ancient and modern writers used the Battle of Thermopylae as an example of the superior power of a volunteer army of freemen defending native soil. The sacrifice of the Spartans and the Thespians has captured the minds of many throughout the ages and has given birth to many cultural references as a result.