Meanwhile the Peloponnesians had abandoned Attica and the adjoining states to their fate, whilst they strained every nerve to secure themselves by fortifying the isthmus of Corinth. The Athenians, relying upon the march of a Peloponnesian army into Boeotia, had taken no measures for the security of their families and property, and beheld with terror and dismay the barbarian host in full march towards their city. In six days it was calculated Xerxes would be at Athens--a short space to remove the population of a whole city: but fear and necessity work wonders. Before the six days had elapsed, all who were willing to abandon their homes had been safely transported, some to AEgina, and others to Troezen in Peloponnesus; but many could not be induced to proceed farther than Salamis. It was necessary for Themistocles to use all his art and all his eloquence on this occasion. The oracle at Delphi had told the Athenians that "the divine Salamis would make women childless,"--yet, "when all was lost, a wooden wall should still shelter the Athenians." Themistocles told his countrymen that these words clearly indicated a fleet and a naval victory as the only means of safety. Some however gave to the words another meaning; and a few, especially among the aged and the poor, resolved to shut themselves up in the Acropolis, and to fortify its accessible or western front with barricades of timber. On his march towards Athens, Xerxes sent a detachment of his army to take and plunder Delphi. But this attempt proved unsuccessful. The god of the most renowned oracle of the Grecian world vindicated at once the majesty of his sanctuary and the truth of his predictions. As the Persians climbed the rugged path at the foot of Mount Parnassus, leading up to the shrine, thunder was heard to roll, and two crags, suddenly detaching themselves from the mountain, rolled down upon the Persians, and spread dismay and destruction in their ranks, Seized with a sudden panic, they turned and fled, pursued, as they said, by two warriors of superhuman size and prowess, who had assisted the Delphians in defending their temple. On arriving before Athens, Xerxes found the Acropolis occupied by a handful of desperate citizens, who made a brave resistance; but they were overpowered and put to the sword. The temples and houses on the Acropolis were pillaged and burnt; and Xerxes thus became undisputed master of Athens. About the same time the Persian fleet arrived in the bay of Phalerum. Its strength is not accurately known, but it must have exceeded 1000 vessels. The combined Grecian fleet at Salamis consisted of 366 ships, of which 200 were Athenian.