The afternoon cooled unnoticed outside the eternal chill of the shaded section of fast-flowing water. Marcus rested with his head leaning to one side or the other, with an eye half submerged and slowly blinking, seeing nothing. His mind could drift until his nose was covered, when he would splutter and raise himself straight again. Then he would dip once more as the pain worsened. They had not spoken for a long time. It had become a private battle, but not against each other. They would stay until they were called for, until Renius came back and ordered them to climb out.

As the day fled, they both knew that they could not climb out. Even if Renius appeared at that moment and congratulated them, he would have to drag them out himself, getting wet and muddy in the process if the gods were watching at all.

Marcus slipped in and out of waking, coming back with a sudden start and realizing he had somehow drifted away from the cold and the darkness. He wondered then if he would die in the river.

In one of those dreaming dozes, he felt warmth and heard the welcoming crackle of a good log fire. An old man prodded the burning wood with his toe, smiling at the sparks. He turned and seemed to notice the boy watching him, white and lost.

"Come closer to the warm, boy, I'll not hurt ye."

The old man's face carried the wrinkles and dirt of decades of labor and worry. It was scarred and seamed like a stitched purse. The hands were covered in rope veins that shifted under the skin as the swollen knuckles moved. He was dressed like a traveling man, with patched clothes and a dark red cloth wrapping his throat.

"What do we have here? A mudfish! Rare for these parts, but good eating on one, they say. You could cut a leg off and feed us both. I'd stop the bleeding, boy, I'm not without tricks."

Huge eyebrows bristled and rose in interest at the thought. The eyes glittered and the mouth opened to reveal soft gums, wet and puckered. The man patted his pockets and the shadows copied his movements, flapping on dark yellow walls that were lit only by the flames.

"Hold still, boy, I have a knife with a saw edge for you…" A hand like rough stone was pressed over his whole face, suddenly larger than a hand had any right to be.

The old man's breath was warm on his ear, smelling foully of rotting teeth.

He awoke choking and heaving dryly. His stomach was empty and the moon had risen. Gaius was beside him still, his face barely above the black glass water, head nodding in and out of the darkness.

It was enough. If the choice was to fail or to die, then he would fail and not mind the consequences. Tactically, that was the better choice. Sometimes, it is better to retreat and marshal your forces. That was what the old man wanted them to know. He wanted them to give up and was probably waiting somewhere nearby, waiting for them to learn this most important of lessons.

Marcus didn't remember the dream, except for the fear of being smothered, which he still felt. His body seemed to have lost its familiar shape and just sat, heavy and waterlogged beneath the surface. He had become some sort of soft-skinned, bottom-dwelling fish. He concentrated and his mouth hung slackly, dribbling back water as cold as himself. He swayed forward and brought up his arm to hold a root. It was the first time a limb had cleared the water in eleven hours. He felt the cold of death on him and had no regrets. True, Gaius was still there, but they would have different strengths. Marcus would not die to please some poxed-up old gladiator.

He slithered out, an inch at a time, mud plastering his face and chest as he dragged himself to the bank. His bloated stomach did seem buoyant in the water, as if filled from within. The sensation as his full weight finally came to bear on the hard ground was one of ecstasy. He lay and began to shudder in spasmodic fits of retching. Yellow bile trickled weakly out of his lips and mixed with the black mud. The night was quiet and he felt as if he'd just crawled out of the grave.

Dawn found him still there and a shadow blocking the pale sun. Renius stood there and frowned, not at Marcus, but at the tiny pale figure of the boy still in the water, eyes closed and lips blue. As Marcus watched him, he saw a sudden spasm of worry cross the iron face.

"Boy!" snapped the voice they had already come to loathe. "Gaius!"

The figure in the water lolled in the moving current, but there was no response. A muscle in Renius's jaw clenched and the old soldier stepped up to his thighs into the pool, scooping up the ten-year-old and throwing him over his shoulder as if the boy were a puppy. The eyes opened with the sudden movement, but there was no focus. Marcus rose as the old man strode away with his burden, obviously heading back to the house. He tottered after, muscles protesting.

Behind them, Tubruk stood in the shadows of the opposite bank, still hidden from sight by the foliage as he had been all night. His eyes were narrowed and as cold as the river.

Renius seemed to be fueled by a constant anger. After months of training, the boys had not seen him smile except in mockery. On bad days, he rubbed his neck as he snapped at them, and gave the impression that his temper was cracking every second. He was worst in the midday sun, when his skin would mottle with irritation at the slightest mistake.

"Hold the stone straight in front!" he barked at Marcus and Gaius as they sweated in the heat. The task that afternoon was to stand with arms outstretched in front, with a rock the size of a fist held in their hands. It had been easy at first.

Gaius's shoulders were aching and his arms felt loose. He tried to tense the muscles, but they seemed out of his control. Perspiring, he watched the stone drop by a hand's width and felt a stripe of pain over his stomach as Renius struck with a short whip. His arms trembled and muscles shuddered under the pain. He concentrated on the rock and bit his lip.

"You will not let it fall. You will welcome the pain. You will not let it fall."

Renius's voice was a harsh chant as he paced around the boys. This was the fourth time they had raised the stones, and each time was harder. He barely allowed them a minute to rest their aching arms before the order to raise came again.

"Cease," Renius said, watching to see that they controlled the descent, his whip held ready. Marcus was breathing heavily and Renius curled his lip.

"There will come a time when you think you can't stand the pain any more and men's lives will depend on it. You could be holding a rope others are climbing, or walking forty miles in full kit to rescue comrades. Are you listening?"

The boys nodded, trying not to pant with exhaustion, just pleased he was talking instead of ordering the stones up again.

"I have seen men walk themselves to death, falling onto the road with their legs still twitching and trying to lift them. They were buried with honor.

"I have seen men of my legion keep rank and move in formation, holding their guts in with one hand. They were buried with honor." He paused to consider his words, rubbing the back of his neck as though he had been stung.

"There will be times when you want to simply sit down, when you want to give up. When your body tells you it is done and your spirit is weak.

"These are false. Savages and the beasts of the field break, but we go on.

"Do you think you are finished now? Are your arms hurting you? I tell you that you will raise that rock another dozen times this hour and you will hold it. And another dozen if you let one fall below a hand's width."

A slave girl was washing dust from a wall at the side of the courtyard. She never looked at the boys, though occasionally she jumped slightly as the old gladiator barked a command. Gaius saw she looked exhausted herself, but he had noticed she was attractive, with long dark hair and a loose slave shift. Her face was delicate, with a pair of dark eyes and a full mouth pressed into a line by the concentration of her work. He thought her name was Alexandria.