Battle of Leuctra
Throughout the decade after the Battle of Leuctra, numerous former allies of Thebes defected to the Spartan alliance or even to alliances with other hostile states. By the middle of the next decade, even some Arcadians (whose league Epaminondas had helped establish in 369 BC) had turned against them. At the same time, however, Epaminondas managed through a series of diplomatic efforts to dismantle the Peloponnesian league: the remaining members of the league finally abandoned Sparta (in 365 Corinth, Epidaurus, and Phlius made peace with Thebes and Argos), and Messenia remained independent and firmly loyal to Thebes.