 By the time of its conclusion, Thebes had been forced to check its expansionist ambitions and return to its old alliance with Sparta.In 382 BC, however, the Spartan commander Phoebidas committed an act that would ultimately turn Thebes against Sparta for good and pave the way for Epaminondas's rise to power.Passing through Boeotia on campaign, Phoebidas took advantage of civil strife within Thebes to secure entrance to the city for his troops.