Passage: In 404 BC, following a defeat at the Battle of Aegospotami, Athens was forced to surrender, ending the Peloponnesian War.  In the wake of this surrender, the Spartan navarch Lysander imposed a strict oligarchic government on Athens, which came to be known as the Thirty Tyrants.  This government executed a number of citizens and deprived all but a few of their rights, eventually growing so extreme that even the moderate oligarch Theramenes fell afoul of the government and was executed.  Fearing for their lives, numerous Athenians fled to Thebes.Thrasybulus had been one of the first to oppose the oligarchy and had been exiled to Thebes shortly after its rise to power.  There, he was welcomed and supported by the Theban leader Ismenias and his followers, who assisted him in preparing for a return to Athens.  In 403 BC, he led a party of 70 exiles to seize Phyle, a defensible location on the border of Attica and Boeotia.  A storm prevented the forces of the Thirty from expelling him immediately, and numerous exiles flocked to join him.  When the Spartan garrison of Athens, supported by Athenian cavalry, was sent out to oppose him, Thrasybulus led his force, now 700 strong, in a surprise daybreak raid on their camp, killing 120 Spartans and putting the rest to flight.

Question: Where did the citizens flee to in fear of their lives?
Thebes