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battle of Leuctra

n. Thebes defeated Sparta in 371 BC; the battle ended Sparta's military supremacy in Greece [syn: Leuctra]

Wikipedia
Battle of Leuctra

The Battle of Leuctra (, Leûktra) was a battle fought on July 6, 371 BC, between the Boeotians led by Thebans and the Spartans along with their allies amidst the post- Corinthian War conflict. The battle took place in the neighbourhood of Leuctra, a village in Boeotia in the territory of Thespiae. The Theban victory shattered Sparta’s immense influence over the Greek peninsula which Sparta had gained since its victory in the Peloponnesian War.