The Battle of Leuctra shatters Sparta's reputation of military invincibility.

The Battle of Leuctra was fought on 6 July 371 BC between the Boeotians led by the Thebans, and the Spartans along with their allies amidst the post–Corinthian War conflict. The battle took place in the vicinity 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 with its victory in the Peloponnesian War a generation earlier.

July 6 is the 187th day of the year in the Gregorian calendar; 178 days remain until the end of the year.