sentences:  The Athenians responded to the news by attempting to intercept Peloponnesian aid and sending a fleet, led by Paches, to Lesbos.Upon arrival, Athens delivered an ultimatum, which ordered the Mytilenians to surrender and tear down their fortifications, but they refused and the rebellion ensued.However, the Mytilenians were forced into revolt before they were militarily prepared to confront Athens, because the Proxenoi alerted them of Mytilene's plans.