Thermopylae and Artemisium were never intended to be decisive stands even though the defeat of the 300 Spartans at Thermopylae has gone down in history as just such a stand. There were also 700 Thespians and 400 Thebans at that defeat but their sacrifice has been all but been ignored. (indeed the historian Herodotus goes out of his way to show the Thebans to be perfidious traitors). The other cities' soldiers had already withdrawn, and fierce debate ensued to keep the alliance together.