At Athens, the oligarchic government that had ruled since 411 gave way to a restored democracy within a few months of the battle. An expeditionary force under Thrasyllus was prepared to join the forces in the Hellespont. This force, however, did not depart until over a year after the battle, and although the Athenians eventually recaptured Byzantium and resumed collecting tribute from Chalcedon, they never truly pressed the advantage that Cyzicus had given them. Largely, this was a result of financial inability; even after the victory, the Athenian treasury was hard pressed to support large-scale offensive operations. Meanwhile, the Spartans, with Persian funding, quickly rebuilt their fleet, and would go on to undermine the Athenian advantage. Athens would win only one more naval battle in the war, at Arginusae, and their defeat at Aegospotami in 405 BC would bring the war to a close. Although Cyzicus was a dramatic victory for the Athenians, the Spartans were eventually able to recover their strength and end the war in their favour, with the surrender of Athens and its allies 6 years later.