The Battle of Thermopylae was key to Athenian victory in the Persian War because it _________.
The Battle of Thermopylae played an important role in Athens's success in the Persian Wars because it delayed the Persian army's approach and allowed the Athenians time to prepare for battle. At Thermopylae, the Persians had to first annihilate a three-hundred- man Spartan army to pass through the mountains and reach Athens. Although they were vastly outnumbered, the Spartans prevented the Persians from proceeding to Athens long enough to give the Athenians time to prepare. Although Athens was initially sacked, the Athenian navy eventually defeated the Persians.