"You should not be climbing that ridge," the surgeon said. "Your lungs are not what they were."

Captain Edward Ashworth smiled. He wrapped the grey scarf once more about his throat.

"The lungs," he said, "were never consulted in my orders."

Dr. Halberd stood in the doorway of the small infirmary, his spectacles clouded by the cold. He was a worried man, and the worry lived in his face as a kind of permanent weather. He had brought the news the way a man brings a coffin: gently, from a distance, as if the weight were not his to carry.

They were at Fort Pendleton, in the high pass where the new railroad was cutting toward the timber line. That autumn of 1883 had come early. Snow stood on the peaks. The valley below the post filled each night with a fog that pressed against the palisade like a visitor asking to be let in.

The scarf had belonged to Ashworth's father. A cavalryman's scarf, old grey wool, knitted by a woman whose name no one remembered. The father had worn it through the war and through the long peace, and had died in it at last, in his bed, at seventy-four, of nothing more dramatic than a stopped heart. Edward had taken it from the peg at the foot of the bed and had worn it for twenty years.

It was wearing out.

Not at the edges, not in the places where it rubbed against a saber hilt. It wore from the inside, a slow unmaking. He would wake in the morning and find a thread loose at his throat. He would pull it — one cannot help pulling a loose thread — and it would come away in his fingers, weightless, grey. By the middle of October the scarf had lost a hand's breadth of length. It was as if something in the fog had begun to feed.

He went down at night. He had not intended to go down. The first time, he saw a light — a small yellow lantern, bobbing at the bottom of the valley. A soldier pursues a light. That is what he told himself. He went down, and the light was nothing: a reflection on marsh water. But on the following night it returned, and the night after, and by the third week he had begun to see the column.

Grey soldiers, marching. They went down the valley in the fog, in order, arms at the slope. Their feet made no sound. Their faces were blurred, as if seen through glass. Ashworth stood on the slope and counted them: sixty-two. The count was always the same.

At the mess he made jokes. He was a flippant man, and flippancy was his armor. He proposed a toast to the undertaker. He advised the young lieutenant to keep his sabre sharp, as the angel of death had a way of requiring it. The men laughed. They loved him. They did not see the scarf fraying.

The surgeon had told him. Consumption, both lungs. He would not see the spring. Halberd had wept a little, but Ashworth had not. He had said, "Then I have a great deal of marching to do." He had meant it as a joke. It had come out as something else.

Then he had planned. This is the thing about soldiers: they cannot stop planning. He would tire his body by day, walking the parapet against the wind until his legs failed. He would sleep with the window shut and the door bolted. He tied the scarf to his wrist, so that if he rose in the night he would feel the pull and wake, and know himself.

The plan held for three nights.

On the fourth he woke at the window. The bolt was undone. His hand was on the latch. The scarf lay on the floor, untied, and its trailing thread ran toward the door, drawn out as if something had plucked it.

He stood a long time in the cold. Then he laughed — a short, dry laugh.

"You are a better general than I," he said to the dark.

He went down that night. The column was there, marching in the white. One of them turned — an old man, grey as ash, his face a blur — and raised a hand. Not a salute. An invitation. Ashworth felt the scarf pull at his throat.

In the morning, the second button of his coat was gone. He did not remember losing it.

He reported to Colonel Whitmore. The order had summoned him to headquarters at nine o'clock, and he went in his dress coat, with the scarf. He did not know why he wore it. It felt like a flag.

Colonel Whitmore was a heavy man with a moustache like a brigade of grey wool. He did not ask Ashworth to sit.

"The captain," he said, "is dying."

"The surgeon," said Ashworth, "is an alarmist. He believes in the stethoscope."

"He believes you wander the valley by night. He believes you have seen a column of soldiers."

The fog pressed against the window. Through it, the mountains were ghosts.

"I have seen them, sir. Sixty-two. They march in order. They have no faces."

The colonel looked at him a long moment. Then his eyes moved to the scarf.

"Your father's," he said.

"Yes."

"It is wearing out."

Ashworth felt the thread at his side. It had wrapped itself once around the holster of his sidearm, a companion.

"Yes, sir. It wears from the inside. I believe the fog takes a thread for each night I go down."

"Then you will not go down."

"I have tried, sir. The window opened in the night. The bolt held nothing. The thread was already out the door."

The colonel rose and walked to the window. He put his hand against the glass, as if he could hold the fog back.

"Edward," he said, "I knew your father. He knew when a thing was done. He let go. That is what a soldier does at the end. He steps out of the ranks and lets the column pass."

"With respect, sir — he died in his bed at seventy-four."

"Exactly," said the colonel.

Ashworth stood. He felt the thread go taut, a small steady pull, like a hand on his sleeve. He heard himself speak, and it was a report, the only honest one he had given.

"I do not know what I am pursuing," he said. "I have told myself it is duty. Reconnaissance. But I have been a soldier for twenty years, and I know the difference between a patrol and a pilgrimage. The column is going down the valley because that is the direction of the march. And the march does not stop."

The colonel was silent.

"I have my father's scarf," Ashworth said. "It is the same grey as their coats. And every night the fog takes a thread, and every night I have a new cleverness — a latch, a line, a plan — and every night the fog is patient. It is the most patient enemy I have ever engaged. I respect it. One must respect a patient enemy."

The colonel returned to his desk. He wrote a furlough, folded it, sealed it with wax, and held it out.

"You will take the morning train," he said. "You will go east, to the sanatorium. That is an order."

Ashworth took the paper. The wax was still warm.

"I cannot obey it, sir."

"You can."

"No. The thread is already out the door. I am only going where it points."

That night he went down early, while the light was still grey. The column had not formed. The valley was only mist. He walked to the railroad cut, where the workmen had turned up a bone in August — a femur, a rib, part of a skull — and had reburied it in the post graveyard with the honors due to an unknown soldier. The bones had not been found in a grave. They had been found in the line of march.

The regiment had been lost in the pass in February 1859. Sixty-two men, marching from the fort to the crossing, swallowed by a blizzard. Their bodies were never recovered. The War Department had listed them as missing. The fort kept a brass plaque and a ceremony each February, and then the snow fell, and the matter was closed.

Each February until you, Ashworth thought.

He stood in the cut. The fog curled around him. He felt the thread go taut — from the scarf at his neck, down the slope of the cut, into the white. A grey thread against the grey frost, running toward the place where the blizzard had made its argument and won.

He understood then. He had not been pursuing the column. He had been pursued by it. He had mistaken the direction of the affair entirely. He had thought his longing was the ordinary longing of a dying man — a soldier's love of order, of the ranks, of the measured step. But the longings of the dead are not ordinary. The sixty-two had lain in the pass for twenty-four years, and they had not wanted vengeance; they had wanted company. They had chosen him because he wore the grey. Because the scarf had been woven in their color. Because the thread, pulled from the inside, was the same thread as their loss.

He should have been afraid. He was past fear. The relief was terrible and complete.

"Sixty-two," he said aloud. The fog made no answer.

He went to Grainger, the master sergeant. He said he had lost the scarf in the valley and would go for it. Grainger offered a detail. Ashworth refused. He asked for one thing only: that a message go to the colonel.

"Say that Captain Ashworth reports," he said. "Say the reconnaissance is complete. Say the column has been identified as the Fifty-ninth. And say the captain has chosen to rejoin his regiment."

Grainger did not laugh. "Sir," he said, "the Fifty-ninth has been dead for twenty-four years."

"They have been drilling for twenty-four years," said Ashworth, "and they are no better for it. They need an officer."

He walked out of the post gate at dusk. He wore his coat and his revolver, loaded, though he knew he would not use it. The fog opened for him like a curtain.

At the bottom of the pass the column was forming. Grey men, coats grey with the years, their faces turned toward him. He raised his hand — not a salute, an acknowledgment, the wave a passenger gives from the platform. Then he unspooled the last of the scarf from his neck.

It came away in his hand. It was short now, a hand's length, the wool worn to a faintness — the wool that his father's throat had warmed and his own throat had warmed, all the long distant affair of it, all the miles of grey. He held it up.

A thread of it lifted. Then another. Then the whole of it, unravelling, weightless, entering the fog as if the fog had been only a greater scarf, the long grey weaving of the valley, waiting for its missing strand.

He watched until there was nothing left in his hand. Then he stepped forward. The column closed around him like a garment.

In the post, the bugler sounded evening call. The fog lay over the valley, and the valley lay over the dead, and the dead lay in order — sixty-three now, with a captain to lead them.

The spring came, as it must. The railroad crossed the pass. The surveyors found nothing: no bones, no buttons, no scrap of grey wool. Only the grade, and the rails, and the distance.

But the old soldiers at Fort Pendleton said that if you stood at the edge of the bluff on a fog-thick autumn night and listened, you could hear a column marching. Not the shoes, never the shoes. The other sound.

The sound of wool, moving through air.

The sound of a thread, being drawn out.