As far as the commissariat is concerned, it is known from Herodotus that it was, to a certain extent at any rate, requisitioned from various regions through which the army passed; but it is also quite certain that, except at a few points along the route, the land traversed was not of a description that would render it possible for the supplies of more than a fraction of the huge host to be drawn from local resources, and that the victualling must have been largely dependent on the fleet. As far as Therma the association of the two branches of the expedition was of a comparatively easy and unimpeded character; but from this point onward the physical difficulties to be met and overcome were infinitely greater. The land to be traversed was, on the whole, poorer than that already passed, and the land route lay, in many places, at some distance from the sea, so that co-operation would be much less easy than it had been hitherto. And yet, despite these difficulties, the commissariat seems to have been still adequately maintained. Herodotus does not describe with any detail the course which the army followed in its advance southward until, at any rate, Thermopylæ had been passed. It is hardly likely that he possessed much information of the incidents of the rapid march through Thessaly, though his remarks about the physical characteristics of that peculiar region seem to emanate from the recollection of one who has actually seen what he is describing. When and how he went there cannot now be said, but the evidence which he himself gives in many portions of his history that he is describing from personal autopsy the scenes of the great events which he narrates is overwhelming. Herodotus was not only the most conscientious, he was also the best topographer among ancient historians. The almost childlike simplicity of his narrative is calculated to create a presumption that the writer would not be likely to inquire into the question of truth or falsehood in the determined fashion which a minute examination of the theatre of events implies. The presumption would, in his case, be eminently erroneous. As a traveller, as heir to the historio-geographers of Ionia, he did not look upon history as having been formed, as it were, in a vacuum. He saw, as a man of his insight must inevitably see, that it is the land that creates the man, not the man the land,—a fact which the marked characteristics of the Ægean region would impress upon a consciousness far duller than was his.