"And never," says Herodotus, "was there a military expedition comparable to this. Hard would it be to specify one nation of Asia which did not accompany the Persian king, or any waters, save the great rivers, which were not exhausted by his armament." Preparations for an expedition of three years were made, to guard against the calamities formerly sustained by the Persian fleet. Had the success of the expedition been commensurate with the grandeur of its commencement, perhaps it would have ranked among the sublimest conceptions of military genius. All its schemes were of a vast and gigantic nature. Across the isthmus, which joins the promontory of Athos to the Thracian continent, a canal was formed--a work of so enormous a labour, that it seems almost to have justified the skepticism of later writers [52], but for the concurrent testimony of Thucydides and Lysias, Plato, Herodotus, and Strabo. Bridges were also thrown over the river Strymon; the care of provisions was intrusted to the Egyptians and Phoenicians, and stores were deposited in every station that seemed the best adapted for supplies. V. While these preparations were carried on, the great king, at the head of his land-forces, marched to Sardis. Passing the river Halys, and the frontiers of Lydia, he halted at Celaenae. Here he was magnificently entertained by Pythius, a Lydian, esteemed, next to the king himself, the richest of mankind. This wealthy subject proffered to the young prince, in prosecution of the war, the whole of his treasure, amounting to two thousand talents of silver, and four millions, wanting only seven thousand, of golden staters of Darius [53]. "My farms and my slaves," he added, "will be sufficient to maintain me." "My friend," said the royal guest, who possessed all the irregular generosity of princes, "you are the first person, since I left Persia (B. C. 480), who has treated my army with hospitality and voluntarily offered me assistance in the war. Accept my friendship; I receive you as my host; retain your possessions, and permit me to supply the seven thousand staters which are wanting to complete the four millions you already possess." A man who gives from the property of the public is seldom outdone in munificence. At length Xerxes arrived at Sardis, and thence he despatched heralds into Greece (close of B. C. 481), demanding the tribute of earth and water. Athens and Sparta were the only cities not visited by his envoys.