Immense, indeed, was the recompense reaped for this self-denial, not merely by Athens but by Greece generally, when the preparations of Xerxes came to be matured, and his armament was understood to be approaching. The orders for equipment of ships and laying in of provisions, issued by the Great King to his subject Greeks in Asia, the Ægean, and Thrace, would of course become known throughout Greece Proper,—especially the vast labor bestowed on the canal of Mount Athos, which would be the theme of wondering talk with every Thasian or Akanthian citizen who visited the festival games in Peloponnesus. All these premonitory evidences were public enough, without any need of that elaborate stratagem whereby the exiled Demaratus is alleged to have secretly transmitted, from Susa to Sparta, intelligence of the approaching expedition.[95] The formal announcements of Xerxes all designated Athens as the special object of his wrath and vengeance;[96] and other Grecian cities might thus hope to escape without mischief: so that the prospect of the great invasion did not at first provoke among them any unanimous dispositions to resist. Accordingly, when the first heralds despatched by Xerxes from Sardis in the autumn of 481 B. C., a little before his march to the Hellespont, addressed themselves to the different cities with demand of earth and water, many were disposed to comply. Neither to Athens, nor to Sparta, were any heralds sent; and these two cities were thus from the beginning identified in interest and in the necessity of defence. Both of them sent, in this trying moment, to consult the Delphian oracle: while both at the same time joined to convene a Pan-Hellenic congress at the Isthmus of Corinth, for the purpose of organizing resistance against the expected invader. [95] Herodot. vii, 239. [96] Herodot. vii, 8-138.