Shortly after this, the Athenians initiated the Common Peace of 375 BC (Κοινὴ Εἰρήνη, "Koine Eirene") among Greek city-states. According to Xenophon, they were alarmed at the growing power of Thebes and weary of fending off Spartan fleets alone as the Thebans were not contributing any money to maintaining the Athenian fleet. However this broke down soon after in 374 BC, when Athens and Sparta resumed hostilities over Korkyra (modern Corfu). During this time period, Athens also gradually became hostile to Thebes. While Athens and Sparta were busy fighting each other, Thebes resumed her campaigns against the autonomous pro-Spartan Boeotian "poleis". Thespiae and Tanagra were subjugated and formally became part of the reestablished democratic Boeotian confederacy. In 373 BC, Thebans under the command of the boeotarch Neocles attacked and razed its traditional rival, the Boeotian city of Plataea. The Plataean citizens were allowed to leave alive, but they were reduced to being refugees and sought sanctuary in Athens. Of the pro-Spartan Boeotian "poleis", only Orchomenus remained.