The Battle of Leuctra (Λεῦκτρα, lêu̯k.tra) was a battle 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.
Boeotian WarLeuctrides
In 371 BC, the newly established democracy of Thebes had elected four Boeotarchs, the traditional title of the generals of the Boeotian League, and so proclaimed their intention of reconstituting the aforementioned league that Sparta had disbanded. During this period, Thebes had an ally in Athens, but Athens was far from happy with the treatment Plataea had received. When it came to swearing an oath to respect the treaty, Sparta swore on behalf of itself and its allies. When Epaminondas came forward, asking to swear on behalf of the whole Boeotian League, the Spartans refused, saying he could swear as the representative of Thebes or not at all. This Epaminondas refused. (According to Xenophon, the Thebans signed as "the Thebans", and asked the next day to change their signature to "the Boeotians", but one of the Spartan kings, Agesilaus II, would not allow it.) In this, Sparta saw an opportunity to reassert its shaky authority in central Greece. Hence, the other Spartan king, Cleombrotus I, marched to war from Phocis.
Rather than take the expected easier route into Boeotia through the face , the Spartans marched over the hills via Thisbae and took the fortress of Creusis (along with twelve Theban warships) before the Thebans were aware of their presence, and then proceeded to Leuctra where they were confronted by the Boeotian army. Initially, the six Boeotian generals (i.e. the Boeotarchs) present were divided as to whether to offer battle, with Epaminondas being the main advocate in favor of battle.