Themistocles used 300 or so war ships to stop the Persians from coming in through the Artemisum Straight so they couldn't get behind the geek lines. The Persians realized that they could sail along the length of the island to get around the blockade, but Themistocles had anticipated tis and had a blockade there also.
Thermopylae in Greece .
The slowing of the Persian advance at Thermopylae by a force from Greek cities, including Sparta, was to force a sea battle ,but the Greek lost at sea, and the delaying force at Thermopylae was withdrawn. The Greeks won their sea battle at Salamis later on, so Thermopylae had no effect on the outcome of the war. It did, however, become a symbol of staunch resistance.
Thermopylae was a small delaying action by a force from a dozen Greek city-states designed to force the invading Persians into a sea battle in the adjacent strait. When the sea battle was lost by the Greeks, the Thermopylae force was withdrawn/
The narrow coastal pass of Thermopylae . August or September 480 BC
Leonidas I was the leader of Battle of Thermopylae.
The Athenian navy was part of the southern Greek fleet which fought the sea battle at Artemesion in the strait next to the pass of Thermopylae. The Athenian component was commanded by Themistocles.
The Battle of Thermopylae occurred , approximately , August or September 480BC .
the battle of Thermopylae took place in August 480 bc
Athens was not involved in the delaying action at Thermopylae Pass. Its manpower was fully occupied manning its fleet as part of the southern Greek fleet at the battle of Artemisia Holding the Pass at Thermopylae was designed to force the Persians to try to outflank the bottleneck by sea, and the Greek fleet was waiting to pounce. The Greeks lost the sea battle and the Thermopylae force, its mission no longer relevant, was withdrawn. This exposed Athens to the advancing Persian army. They evacuated the city and it was occupied by the Persians. So Athens was not helped by Thermopylae.
The answer is no Because Thermopylae is a battle not a city.
The pass at Thermopylae was held to precipitate a sea battle to destroy the Persian fleet in the nearby strait of Artemesia - the sea battle was lost so the blocking force was withdrawn. The Spartan contingent continued to hold the pass to cover the blocking force's withdrawal. It was annihilated, but won lasting fame for its selfless sacrifice.
It was prepared for war to defend itself and contribute to and lead the Greek effort by sea and land to oppose the Persian invasion. Thermopylae was a holding operation to force a sea battle in the hope of destroying the Persian navy which threatened the Greek cities. The failure of this plan led to a subsequent sea battle at Salamis which succeeded. Sparta then led the coup de grace in the land battle at Plataia.