held the pass of Thermopylae against the Persians for three days before being outflanked by a mountain path. Much of the Greek army retreated, before the Spartans and Thespians who had continued to block the pass were surrounded and killed. The simultaneous Battle of Artemisium was up to that point a stalemate; however, when news of Thermopylae reached them, the Allied fleet also retreated, since holding the straits of Artemisium was now a moot point. Prelude The Allied fleet now rowed from Artemisium to Salamis to assist with the final evacuation of Athens. En route Themistocles left inscriptions addressed to the Ionian Greek crews of the Persian fleet on all springs of water that they might stop at, asking them to defect to the Allied cause. Following Thermopylae, the Persian army proceeded to burn and sack the Boeotian cities that had not surrendered, Plataea and Thespiae, before marching on the now evacuated city of Athens. The Allies (mostly Peloponnesian) prepared to defend the Isthmus of Corinth, demolishing the single road that led through it, and building a wall across it. This strategy was flawed, however, unless the Allied fleet was able to prevent the Persian fleet from transporting troops across the Saronic Gulf. In a council-of-war called once the evacuation of Athens was complete, the Corinthian naval commander Adeimantus argued that the fleet should assemble off the coast of the Isthmus in order to achieve such a blockade. However, Themistocles argued in favour of an offensive strategy, aimed at decisively destroying the Persians' naval superiority. He drew on the lessons of Artemisium, pointing out that "battle in close conditions works to our advantage". He eventually won through, and the Allied navy remained off the coast of Salamis. The time-line for Salamis is difficult to establish with any certainty. Herodotus presents the battle as though it occurred directly after the capture of Athens, but nowhere explicitly states as much. If Thermopylae/Artemisium occurred in September, then this may be the case, but it is probably more likely that the Persians spent two or three weeks capturing Athens, refitting the fleet, and resupplying. Clearly though, at some point after capturing Athens, Xerxes held a council of war with the Persian fleet; Herodotus says this occurred at Phalerum. Artemisia, queen of Halicarnassus and commander of its naval squadron in Xerxes's fleet, tried to convince him to wait for the Allies to surrender believing that