The Battle of Thermopylae was fought in 323 BC between the Macedonians and a coalition of armies including Athens and the Aetolian League in the pass of Thermopylae during the Lamian War.

This article relies largely or entirely on a single source. (March 2020)

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Battle of Thermopylae
Part of Lamian War
The battlefield today
Date 323 BC Location Thermopylae Result Athenian victory
Belligerents
Athens, Aetolian League	Macedon
Commanders and leaders
Leosthenes	Antipater
Strength
	13,000 infantry 600 cavalry[1]

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After Antipater received news of the outbreak of the war, he sent messengers to Craterus and Philotas who were in Asia with an army of over 10,000 soldiers, to come to his aid.^[1] But receiving news of the progress of the war and realizing that he could not wait for his reinforcements to arrive, he marched south to Thessaly with 13,000 foot soldiers and 600 horsemen,^[1] while he left Sippas in command of Macedon. But the Thessalians, who initially supported Macedon, changed sides to the Athenian alliance and joined the Athenian general Leosthenes' forces in occupying the passes of Thermopylae, significantly outnumbering the Macedonians. Antipater was defeated in the ensuing battle and since he could not retreat because the Athenian coalitions' forces were stronger than his forces, he shut himself in the city of Lamia where he was subsequently besieged by Leosthenes' forces.^[1]