the Persians in the field for as long as possible. Xerxes had obviously not anticipated such resistance, or he would have arrived earlier in the campaigning season (and not waited 4 days at Thermopylae for the Greeks to disperse). Time was now of the essence for the Persians – the huge invasion force could not be reasonably supported indefinitely, nor probably did Xerxes wish to be at the fringe of his empire for so long. Thermopylae had shown that a frontal assault against a well defended Greek position was useless; with the Allies now dug in across the narrow Isthmus, there was little chance of conquering the rest of Greece by land. However, as equally demonstrated by Thermopylae, if the Greeks could be outflanked, their smaller numbers of troops could be destroyed. Such an outflanking of the Isthmus required the use of the Persian navy, and thus the destruction of the Allied navy. Therefore, if Xerxes could destroy the Allied navy, he would be in a strong position to force a Greek surrender; this seemed the only hope of concluding the campaign in that season. Conversely by avoiding destruction, or as Themistocles hoped, by crippling the Persian fleet, the Greeks could effectively thwart the invasion. However, it was strategically not necessary for the Persians to actually fight this battle at Salamis. According to Herodotus, Queen Artemisia of Caria pointed this out to Xerxes in the run-up to Salamis. Artemisia suggested that fighting at sea was an unnecessary risk, recommending instead: The Persian fleet was still large enough to both bottle up the Allied navy in the straits of Salamis, and send ships to land troops in the Peloponnese. However, in the final reckoning, both sides were prepared to stake everything on a naval battle, in the hope of decisively altering the course of the war. The Persians were at a significant tactical advantage, outnumbering the Allies, and also having "better sailing" ships. The "better sailing" that Herodotus mentions was probably due to the superior seamanship of the crews; most of the Athenian ships (and therefore the majority of the fleet) were newly built as according to Themistocles' request to the Athenians to build a fleet of 200 triremes in 483 BC, and had inexperienced crews. It is important to note that despite the inexperienced crew on the part of the Athenians, these newly constructed triremes would ultimately prove crucial in