Primum Non Nocere

The femoral artery, when severed, empties a man in four minutes. Three if the heart rate is elevated. Two if he panics. The legionary on the ground has maybe ninety seconds because he is doing all three, hands clamped around his upper thigh where the framea went in and came out the other side, and from his mouth comes a low, wet negotiation with something he cannot see.

The mud takes both my knees when I kneel beside him. September in this country, and the ground holds no warmth past the first inch.

Rain has been falling for two days. A fine, filtering rain, the kind that comes through beech and oak canopy and settles as mist that never dries, that turns wool into a second skin and leather into something treacherous underfoot. The light here is green. Has been green since we entered the forest. Green and close and heavy, like looking up from the bottom of a river.

Sphagnum moss packed into the wound. Pressure with both palms. The moss grows on every fallen trunk in this country, and for two days now the satchel has been filling between attacks, because sphagnum absorbs more fluid than any linen compress in my stores. A Cherusci healer taught me this when I was six years old. A Greek physician in Rome taught me again when I was fourteen.

"Hold here." His hands over the compress. "Press down. Do not lift your hands."

His pupils are the size of sesame seeds. His pulse, when I find it at the wrist, is slower than it should be. His skin is the color of wet chalk. I note the slow pulse in the log. Some men's hearts do not race when they should.

"How old are you?" I say.

"Nineteen," he says. "Twentieth birthday in November."

"Press down."

The next one.

The column has been strung out for four miles through the forest since the morning of the eighth, when the first framea sailed out of the tree line. Two days ago. At my triage station the wounded arrive from both directions, which means there is no front and no rear, only a line being eaten from both sides. Baggage carts, camp followers, women, merchants who sold rope and nails and salted pork to every campaign that would have them. All of them jammed between trees on a track too narrow for two carts to pass.

Every recruit learns that a column is the worst possible formation for an ambush. Varus governed Syria. Varus led them in anyway, because Arminius told him the path was safe.

Arminius, whose Latin was better than mine. Arminius, who could quote Cicero while splitting a walnut with his bare hands, whose knuckles were scarred from the Illyrian campaign, who wore his equestrian ring the way other men wear a scar they are proud of.

Another wound. A javelin entry through the deltoid, clean pass, no bone fragments. The legionary is a Gaul, pale under his tan, and his fingers will not stop moving, touching the edges of the wound, the wrapping, the mud.

"Leave it," I say.

"My mother," he says. His Latin has that Narbonensian slur, the vowels too open, the consonants soft. "My mother bakes bread. In Nemausus. She has a brick oven she built herself."

"Tell me about the oven."

"It holds twelve loaves. She fires it with grapevine cuttings because they burn clean. You can taste it in the bread. You can taste the vine."

The dressing ties off. His fingers find the knot immediately.

"Calvus," I say. "Your name."

"Yes."

"Calvus. The bread. How does she make each loaf?"

"She folds the dough. Over and over. She says you fold it till it goes soft, till it feels like, like a baby's arm."

"Tell me how she makes it. Every step. From the flour to the oven. And when you reach the end, start again. And do not touch the dressing."

His lips begin moving. My hands, slick with his blood, pause on the knot. The pause lasts less than a second. Clean the hands on the tunic.

Here is what the Teutoburg forest smells like on the second day of a three-day massacre: iron from the wounds, wet wool from the living, and the particular sweetness of human shit when the gut has nothing left to give but bile and mucus.

They started cramping on the first night of the march. Before the ambush. Men dropping out of the column to squat in the underbrush, faces gray, legs shaking. Bad water from a stream near the summer camp, the camp prefect said. Camp fever. Happens every year in the field. He ordered double rations from the supply barrels and told the medici to prepare for a difficult march.

The men squat at the edges of the track and they cannot stop. The stench of them layers over the rain and the wet bark. Between the attacks, between the cries of the wounded, the forest fills with the sound of men voiding themselves into the underbrush, and the sound of rain on leaves, and the sound of birds that have not left because the birds do not care.

Centurion Petronius finds me at the overturned baggage cart where the triage station sits. He has a gash across his forearm, deep enough to show the white layer of fascia beneath the skin, and he holds the arm away from his body as though it belongs to someone else.

"Listen," he says. He always starts with that word.

"Sit."

"Listen, medicus. Varus is holding a war council two hundred paces north. He wants to build a fortified camp."

"Sit down and give me your arm."

He sits on a wheel hub. Rain drips from the crest of his helmet. Fifty-three years old, and the muscles of his forearm are ropy and brown, the forearm of a man who has swung a gladius for thirty years and still dreams of pressing olives.

"A camp," he says. "In this." He gestures at the forest, the mud, the green half-light. "You plant a vineyard in soil that drains. You terrace the slope so the roots don't rot. You choose the site before you dig. This man chose nothing. This man walked into a swamp and wants to build a villa."

The wound gets acetum. He does not flinch.

"Arminius," he says.

The bone needle threaded.

"Where is Arminius?"

"He rode out this morning. Said he was gathering allied reinforcements."

Petronius looks at me. His eyes are the color of unglazed terracotta.

"You are Cherusci," he says.

"I am a Roman citizen." The needle goes through the edge of the wound. The skin resists, then gives. "Hold still."

"You are a Roman citizen who speaks Cherusci and looks Cherusci and came to Rome as a boy in the same cohort of hostages as the man who just rode into those trees."

"I came to Rome when I was five."

"Listen." He winces as the needle goes through a second time. The fascia is tough here, where the forearm flexes. "I have grown grapes. You know what a grapevine does when root worm gets into the soil? Nothing. Looks healthy. Leaves stay green. Fruit swells." He stops. The thread pulls through. He watches it tighten. "And underground, the root is being eaten alive. By the time you see it, the vineyard is dead. Every vine. You pull them up and the roots are powder."

He watches me stitch.

"You are either the vine or the disease, medicus. There is no third thing."

The suture ties off. Thread trimmed. The arm wrapped in linen that was white this morning and is now the color of the forest floor.

"Change this dressing twice daily," I say. "Keep it dry."

He laughs. One short sound. He looks up at the rain that has fallen for two days and will fall for another three. Helmet back on. He draws his gladius with his good hand.

"My vineyard," he says, and his gaze drops to the mud between his feet, the way a man stares at ground he is already measuring for vines. He has told me about the hill near Pompeii. The south-facing slope. The volcanic soil that holds heat after sunset. The way Falernum grapes need to suffer to produce a wine worth drinking.

"My vineyard is going to be magnificent," he says.

He walks into the green dark.