It was stretching paranoia to extremes, of course, to imagine Xerxes the mere tool of a fiendish global conspiracy masterminded from Tyre. The King of Kings went to war on no one’s behalf save his own. The Phoenicians, just like any other subject people, were his slaves. They were obliged to pay him tribute, to host a satrap and even, when they sailed to war, to submit to the authority of a lubberly Persian courtier. But that is not to say that the Phoenicians lacked all influence with the imperial high command. The Medes aside, there was perhaps no group of people in the Persians’ entire dominion with such ready access to the royal ear. The kings of Tyre and Sidon were perfectly aware that the Great King’s expedition would be holed below the waterline without the enthusiastic participation of their fleets. So it had always been. Cambyses, when he founded the imperial navy, had soon discovered the limits of what he could achieve with his new toy. Ordering a task force prepared for the conquest of Carthage, he had been astounded to have his plans vetoed by the Phoenicians, “on the grounds that it would be an unnatural deed for them to go to war with their own children.”50 The lesson of this startling display of lèse-majesté was one that Persian strategists had been quick to absorb. While the levies of other subject nations could be dragooned into war, it was wise to handle the Phoenicians more diplomatically. Slaves though they were, it might sometimes prove counterproductive to rub their noses too brutally in the fact. Better to have them sailing not merely as conscripts but as eager partisans for the cause of the King of Kings. Better, in short, to have them believe that their own interests were also at stake.
And, of course, in the enterprise of Greece, they certainly were. The Phoenicians, who had provided the Persians with the bulk of their fleet at Lade, had already profited hugely from the destruction of Miletus—a city once quite as much of a commercial hub as Sidon or Tyre. Were Athens to be flattened in a similar manner, and the neutralization of Corinth and Aegina secured, then the prospects for Phoenician business would glitter promisingly indeed. As a result, enthusiasm in the chanceries of Tyre and Sidon for the Great King’s war was unstinting. The Phoenicians brought three hundred ships with them to the Aegean: more than the entire fleet of Athens. Nor had these been patched together in a hurry: Sidon, which competed with Corinth for the title of birthplace of the trireme, had been at the forefront of naval innovation for centuries. The Athenian oarsmen, often with only a few months’ practice under their belts, would find themselves, in their first true taste of battle, going head to head with the very best.
Horrendously outnumbered too. The Phoenicians were far from the only people to have sent a fleet in answer to the Great King’s summons. Some, notably the Egyptians and the Ionians, were almost the equals of the Sidonians with an oar. True, both came from satrapies with a track record of rebellion; and perhaps, as they snooped along the harbor front, the three Greek agents found some hope in this fact. If so, they were clutching at straws. The Persian admiralty, having been caught napping in the early days of the Ionian Revolt, knew better now than to neglect their backs. Command of the Egyptians and Ionians had been placed directly in the hands of two of Xerxes’ brothers, and every ship in the armada manned with marines of proven loyalty. Why, then, would anyone in the Great King’s fleet risk mutiny and their own annihilation for the sake of the Athenians, who were clearly doomed anyway? No one crowded into the ports of Ionia that winter could have had much doubt on that score. The mammoth fleet would soon start sweeping along the Aegean coastline, and all who stood in its way were bound to be destroyed. The Greek spies totted up 1207 triremes: a figure of suggestive precision.51 Whether all that vast number would embark for Greece and, if they did, whether they would all survive the summer storms unscathed were questions that only the campaign to come would answer. But the odds, even if the Great King lost a quarter of his fleet, even if he lost a half, would still be far from balanced. One simple, brutal fact, to the Greek spies, was menacingly clear. The allies, come the summer, would be facing a force greater than any that had ever been seen at sea.
And by land? Only a visit to Sardis could answer that question. The Greek agents hurried on. By their third day of travel from the coast, they could see ahead of them, obscuring the silver mountains that loomed to the east, an ominous pall of smoke. Soon, nearing their destination, they began to make out great humps of earth, the cemetery of the ancient Lydian kings; then, dimly through the haze, Sardis itself, the red cliffs of the acropolis framed by steepling walls and surmounted by Croesus’ monumental palace. The banners that flapped over the city’s battlements, however, one adorned with “an image of the sun enclosed in crystal,” and the other, the royal battle standard, embroidered with the image of a golden eagle,52 were those of a monarch mightier by far than Croesus had ever been; and the evidence of his greatness, there before the dumbfounded agents’ gaze, stretched for miles far across the plain. The smoke they had seen from the far distance was pluming up from campfires: thousands upon thousands of them. Whether huddled in tents, or practicing with their outlandish weaponry or jabbering in their impenetrable tongues, the multitudes of the Great King’s army seemed conjured from a world stranger and more barbarous than most Greeks had ever cared to imagine. All the spies’ darkest forebodings appeared fulfilled. The remotest reaches of Asia and of Africa had emptied themselves. Millions upon millions would be pouring, in barely a few months, into Greece.
Or so it seemed. In truth, to count—or even to estimate—such monstrous hordes was no easy matter; and the spies, before they could even start their calculations, were unmasked and apprehended. The men who had arrested them were soldiers, not intelligence officers, and so it never crossed their minds not to have their captives tortured, then put to death. Just as the sentence of execution was about to be carried out, however, captains from the Great King’s personal bodyguard came rushing up, frantically ordering that the prisoners must be spared. Led stumbling up the acropolis into the inner depths of the palace, the three spies found themselves, to their astonishment, being personally interrogated by the Great King himself, then escorted on a full tour of the imperial camp. Only once they were laden down with copious notes were they finally sent packing back to Greece.
And the reports they took with them, just as the Great King had intended they would be, dealt only in terrifying superlatives. What the spies had been shown was nothing less than a panorama of his world-spanning dominions. At its heart the Great King himself and his crack corps of bodyguards: the thousand who attended him personally and bore golden apples on their spear butts, and then a further nine thousand, also hand-picked, with silver apples on their spears, a shock force of warriors known collectively as the “Immortals”—“for if one of them were killed or fell sick, a replacement would immediately step forward to fill the gap in the ranks.”53 Then elite contingents of cavalry, from Persia and various subject nations: Media, Bactria, India, the steppes of the Saka. Finally—for the Great King lacked heavy infantry fit to measure against the bronze-clad hoplites of Sparta or Athens—teeming brigades of spear fodder: exotically armed levies who might not, under normal circumstances, have appeared to a Greek observer as anything other than contemptible foes, but who, rolling forward in a great torrent of humanity, might be expected to sweep away any shield wall standing in their path. This, at any rate, was how it was reported back in Greece—for the three spies, reliant on their own dazzled estimates of the Great King’s troop numbers, and no doubt on records helpfully provided by their Persian minders, did indeed find themselves talking in terms of millions. One million, seven hundred thousand to be precise—and even that total took no account of the levies that the Great King was planning to recruit as he advanced through Thrace and into Greece.