I cornered him during a brief moment of quiet. "The Black Sea, Xenophon? It's a thousand miles from here, through Media and the land of the Kurds and across the mountains of Armenia. Winter is coming on. Do you realize what you are demanding?"

He avoided my gaze as he laced his sandals. "It's the only route we have," he muttered, for the first time allowing an expression of discouragement to cross his face. "You know we can't go back the way we came, over the desert, and there are no passable roads west, across Asia Minor. Our only hope is to strike north, across the mountain passes to the Black Sea. There are little Greek trading cities clinging to the southern shore like a string of pearls-Sinope, Cotyora, Trapezus. We could raise a fleet in one of them and return through the Hellespont to Ionia and the mainland."

I snorted. "And how do you think to buy a fleet? You expect to extract gold and booty from the mountain tribes we conquer along the way? My recollection from Herodotus is that they're scarcely more than savages."

He stopped fiddling and finally looked straight up at me, almost angrily. "Who said anything about buying a fleet? Don't you sell me short, Theo. This was not an impulsive decision. Of course we won't buy a fleet. We'll extort one."

I looked at him quizzically.

"There are Greeks along that string of trading posts, Theo," he continued, "but does that mean they're our brothers? Hardly. They'll be as dismayed as Artaxerxes was to see us arrive, and as delighted when we leave. They'll trip all over themselves to give us ships. If you were a citizen of muddy little Trapezus, how would you like to see ten thousand ugly, hungry mercenaries camped outside your city walls?"

I conceded his point, but was still doubtful that this was sufficient basis to drag ten thousand men through the mountains in the middle of winter.

Xenophon conferred again with Chirisophus as we arranged our battle lines, and they decided to form the troops into a hollow square, with the remaining baggage and mob of camp followers in the middle for protection. Chirisophus and his Spartans would lead and break through any Persian troops attacking us head on, while Xenophon would command the rear guard, fending off any nipping from Tissaphernes' cavalry in its attempts to break through the ranks into our supply train.

Just before leaving, we were informed by our scouts that a Persian embassy was arriving and Xenophon and I went reluctantly to meet them, wondering what good news they could possibly have for us, and whether any they did bring could ever be trusted. To my surprise Mithradates, a Hellene who had served under Ariaius and had recently deserted to Tissaphernes, came galloping up with thirty horsemen. He affected a warm greeting for his fellow Greeks, but Xenophon remained distant.

"Be quick about your business, Mithradates, or I'll make your safe-conduct as worthless as the one your Persian puppet masters offered Clearchus. You'll be yapping back to your own lines with your tail between your legs."

Mithradates set his mouth in a tight expression and dismounted. At a nod from Xenophon, a squad of burly hoplites seized his horse and led it away. They forced his Persian colleagues off their mounts too, and took those horses to the baggage train. Mithradates protested at this treatment, but Xenophon explained. "The gods forbid us from violating a sacred oath of safe conduct for heralds and ambassadors," he said with a bitter laugh, "but to my knowledge they say nothing of our treatment of livestock."

A crowd started to gather to listen to the parley, and I saw Asteria standing with a group of camp followers, craning her neck to see above the men in front of her. I caught her eye, and she gave me a tight-lipped nod of acknowledgment, barely perceptible, a grim expression in her eyes.

Mithradates collected his composure, and began. "You know I was faithful to Cyrus while he was alive, and I remain a Greek," he said after a pause, wistfully watching the rich trappings being removed from his animal. "Tell me what you propose, and if I believe you have any chance at all, I will gladly join you, with all the men at my disposal. Think of me as a friend and advisor."

Chirisophus, who had joined me by that time, scoffed. "We're going home. You can tell your masters we'll be moving fast through the country, taking only what we need and doing as little damage as possible, if we're let alone; but if anyone tries to hinder us they'll be sent back squealing like a pig, whether they be Persian or otherwise." He glowered at Mithradates.

Mithradates held his gaze evenly, then turned away dismissively and addressed Xenophon again. "It's impossible for you to move through this country without the king's consent. You have no provisions and I see now that you have burnt your supplies. Is the king to provide tents for you now, as well as a safe conduct? Are you going to start complaining about the quality of the wine he sends to quench your thirst?"

Chirisophus roared in a rage and lunged at Mithradates, his dagger aimed at his throat. I and some others held him back, but Mithradates barely flinched.

"Mithradates, you're under a safe-conduct, and I'd advise you to leave now while you still can," said Xenophon quietly. "The troops are under control, we have a new command. Remind Tissaphernes of his men's cowardly performance at Cunaxa. We will be marching through the king's country today, consent or no consent."

Mithradates glared at him for an instant in a cold fury, then recovered his poise. Taking a deep breath to collect himself, he again pointedly ignored Chirisophus and addressed Xenophon directly.

"Tissaphernes has one more request," he said. "Release all Persians you are holding as hostages, and he will then consider giving you safe passage out of the king's lands."

At this, the Greek officers fell silent, looking to one another in bewilderment. My conversation with Asteria the night before came back to me, and as I glanced at her now she avoided my gaze, fixing her eyes on Mithradates alone. Xenophon stepped forward, to the front of the Greeks, and turned to face us.

"Fellow Greeks!" he shouted in a clear, commanding voice, and all went silent. "Anyone who feels they are traveling under coercion, or who believes it to their advantage to join the Persians, may do so now, unimpeded. I stand here prepared, this very minute, to grant safe conduct to the Persian lines to all who desire." He then stood still and silent, searching the crowd of muttering soldiers from face to face, fiercely holding their stares for a long moment. My eyes locked on Asteria's, and hers, wide and unblinking, focused fixedly on Xenophon, her face bloodless and her lips slightly parted and trembling. I held my breath as I waited for her to react. She stood distraught and tense, poised as if to walk forward at any moment, yet she remained still.

Xenophon finally dropped his gaze and turned back to Mithradates. "We have no Persian hostages," he said evenly, "and Tissaphernes knows that. Everyone traveling with us does so voluntarily. If Tissaphernes is trying to create a pretext for moving against us, then he needn't go to the trouble. Tell him to simply attack, openly and like a man, and then he'll see what it's like to taste Greek iron, rather than holding back in cowardice as he did at Cunaxa."

Mithradates stared at Xenophon wrathfully, then turned on his heels and stalked back out of the camp in the direction from which he had come. His Persian assistants followed, wrapping themselves in as much dignity as they could muster, tramping through the mud and horseshit in their thin pointed slippers. Their stallions had already been disposed of. Chirisophus was still breathing hard, but had calmed down sufficiently to stalk back to his own troops, and had them arranged in marching formation in a trice. The camp followers and rear guard took somewhat longer, but by mid-morning the army was ready, and we moved slowly across the plain, leaving nothing behind but a pile of charred remains emitting putrid black smoke, and the last of our dreams of a triumphant return to Greece through the front door.