Here is something Augusta told me, that night in the China Hall, about the war.

There was always a fresh wind from the sea around Number One Canadian Hospital in Étaples, she said. A fresh wind from the sea, even in the fog, so that she couldn’t understand why the greyness persisted, why it didn’t just blow away. On clear days the dunes changed constantly under the moving sun. Once when she was sitting on the back steps of one of the wards she watched a red tide climb a distant sand hill — poppies coming into first flower under the touch of daylight. It was dawn, after a long night during which she had anesthetized five soldiers for amputations. Two had died. The poppies were like a stain on the hillside, she said, like blood.

Behind the hill there was a huge half-circle of sand with an acre of flat space at its foot that stubbornly held its shape despite the inconstancy of the surrounding dunes. The French called it the amphitheatre and maintained it had been there since Roman times. Here the staff played baseball and soccer and held Dominion Day celebrations on July 1, performing skits and singing songs about a country Augusta could barely remember, the world of the hospital having become the only nation she felt any allegiance to. It was here, later in the war, that she would come to know Maggie.

Nothing was fixed or permanent in that geography, Augusta said. The wind moved in from the sea and changed the shape of the acres of dunes that surrounded the hospital and base camps. Soldiers departed for the trenches and returned, ruined, on long hospital trains that unloaded their freight into the wards. The men were treated. Some died, some were moved to England or Canada, depending on their wounds. Many were patched and sent back to the front. The medical staff too was often being posted to new locations: a manor house in England, a large hotel on an empty beach, something unimaginable in Italy or Greece. Encounters were brief; brutal or tender, gone like dreams in the morning. The King visited the hospital wards once and was forgotten the next day, another face in an ever-changing sea of male faces. Aviators dropped messages from planes for nurses who had left Étaples months before. “God and the Hun willing,” one of the letters read, “we’ll meet again someday.”

Augusta had been in the Number One Canadian Hospital longer than most, for a full year by the time she met Maggie. Before that there had been Salonica, then Kent, then Boulogne. She kept odd memories from each posting, memories that mostly concerned her own person, as if her body were the provider of the only reliable information. She had combed lice from her hair in Salonica, had recovered from diphtheria in Boulogne, and it was here, in Étaples, that she had pierced her own arm with a needle in order to fight the fatigue. Only once, she whispered to herself, only once or twice, she said, recalling the flood of calm, of comfort, which followed the injection.

In late November of 1917, Augusta began to visit the buried amphitheatre in the dunes as often as she could manage it. There were few hours of daylight in that season and the rain was almost unceasing, but none of that mattered to her. Weather would not stop her, work sometimes did, though even when the casualties were pouring in from the front she was frequently able to steal a half-hour — sometimes in the middle of the night — to climb the sand hills behind the hospital and to settle herself down for a few moments beside the scrub pines that clung to the edge of the circular ridge. The amphitheatre was definitely there, she decided, sleeping under the sand. It would always be there; it had to be. She had no desire to unearth it, no desire for proof The shape it described in the sand that protected the territory of the arena below, her own conviction, provided more certitude than she had witnessed anywhere in recent times. Its constancy brought comfort to her.

Fred had been reported missing at Passchendaele. Even in death there was no certainty, though God knows Augusta had seen it close the faces of enough young people to believe in its finality. She would awaken in the nurses quarters each day and whisper over and over, “Fred is dead, no, Fred is not dead.”

She hadn’t seen her brother for three years. When she tried to remember the shape of his eyes, his hands, they became confused with the hands and eyes of the thousands of men over whose beds she had bent under the billowing ceilings of tents or beside the cold wooden walls of huts. Early in the war, when she had been told that her brother Charlie had died of meningitis at the training camp on Salisbury Plain, she had dreamed of him each night for months and had awakened sobbing each morning. But she could not call up Fred’s face, hear his quiet laugh. Because her dreams now all took place in the wards, they were filled instead with grey blankets and soiled linen. Her mind seemed incapable of playing with other images. Fred was dead. Fred was not dead. The amphitheatre would be there, she decided, under the sand. Forever.

She walked to this spot each day she could, through sandstorms, through thunderstorms, through snowstorms. By February of 1918, the weather was uncharacteristically bright and calm; the hospital itself, when she turned to look back at it, appearing in this clarity almost permanent, huts having by now replaced almost all of the original tents. It was as if, Augusta mused, a tribe of nomadic hunters and gatherers had progressed to a fixed agrarian society — except for the fact that nothing would grow on these dunes, and the population was constantly changing, and civilization still slept in its stone solidity beneath the surface, tens of feet down.

March was the time of the most disorienting fogs, fogs so thick they obliterated the views from the windows of the wards. But by then Augusta could have walked to the amphitheatre in her sleep, she had made the trek so often. She liked the indeterminate quality of these grey days, enjoyed the sound of trains she wasn’t able to see rattling on the bridge that crossed the River Canche and the odd voice reaching her from the hospital below, or, by contrast, no noise at all except that of the wind from the sea, which should have blown away the fog.

It was in early March, in the midst of a particularly dense fog and after she had been sitting on the sloping sand for twenty minutes or so, that Augusta became aware of unfamiliar sounds — scratching, and a slight fluttering — somewhere quite near her at the amphitheatre. She straightened her spine and listened more carefully. Then she relaxed again.

“Birds,” she said. She told me she often spoke aloud when she was alone at the amphitheatre, liking the reassuring sound of her own voice when it was meant for no one but herself. “Birds,” she repeated. “Birds in the fog.”

The girls voice surprised her. “Hello,” it said. “Hello, are you there?”

Augusta did not reply right away. She was a little shocked by what she felt to be an invasion of an exclusive territory. Having never met anyone out on the dunes before, except at planned events, she wasn’t quite sure whether the voice was intended for her. “Here,” she eventually said. “I’m over here beside the pines”

“I can’t see you,” the voice said. “So keep speaking until I find you.”

A command. Augusta swallowed, then paused. “What shall I say?” she asked.

“Sing the ‘Marseillaise.’”

A hoot of laughter.

“‘The Maple Leaf Forever’ then.”

“No,” said Augusta. “I can’t bear that. No maple leaf is ever forever.”

“‘The thistle, shamrock, rose entwined … the maple leaf forever.’” The girl’s voice was strong and clear now.

“I can’t bear songs with dauntless heroes in them,” said Augusta. She thought for a moment. “‘In days of yore, from Britain’s shore, Wolfe the dauntless hero came,’” she sang, remembering how she and her twenty classmates had sung the patriotic Canadian song at the village school whenever there were pageants or Christmas plays. How many of these children were dead now, or wounded? “‘And planted firm Britannia’s flag on Canada’s fair domain,’” she continued, recalling the now suddenly old-fashioned colonial words. “What tosh!” she added, though she was speaking mostly to herself.

“Britannia est magna insula,” said the voice. An interval, then, “But it isn’t really, is it? Such a small place for so much trouble.”

“Trouble,” said Augusta bitterly. “Yes.”

“I can almost see you.” The girl emerged from the fog. “There, now I can see you.” She smiled. Radiantly.

The girl was thin, with extremely fair hair, and was, Augusta decided, quite beautiful in a fragile way. She had taken off her nursing veil, probably once she began to walk out on the dunes, and now, because of the wind, it looked like a large white bird fluttering at the end of her hand. She stood looking down at Augusta and wrapping the white cloth around and around her wrist like a bandage. Then, abruptly, she sat down on the sand. “I’m Maggie Pierce.”

Augusta was thinking, I know her. “Augusta Moffat,” she said. And then, “Have I seen you before?”

“Maybe, probably not. I’ve only been here for two days … transferred from Boulogne. But I saw you, from a distance. You were on your way out here when I first arrived. I thought. Wherever she’s going… away from the hospital… it will be the perfect place to write my letters.” She placed her hand on some bright-blue notepaper folded and tucked inside her belt. “I like to write them outside.”

What Augusta had presumed to be birds was merely the sound of a girl attempting to write a letter, outside, in a strong wind.

“I haven’t finished this one,” the girl said, touching the paper again with her long white fingers. “It’s hard to find the time to finish them. Sometimes I write in the dark after lights out. Have you ever tried to write without looking? You’d be surprised; the writing is as neat and as straight as ever.”

At that moment it occurred to Augusta that she hadn’t written a proper letter in years. Nothing except postcards to her mother with a series of similar messages: I am fine. We are working hard. It is cold and rainy. “Who are you writing to?” she asked.

“To Peter,” the girl said. “A very exasperating boy. I’m mostly very angry with him. Sometimes I’m writing to tell him why. Other times I tell him what has happened to me during the day. I’ve already described this place to him … the river and the sea and the dunes. He would be interested in the river. He used to like to go fishing, but he would never let me go along. That made me angry too.”

Augusta remembered that Fred had liked to fish. All her brothers had, but Fred liked it especially because of the quiet. She tried to picture him, entering the kitchen with three or four brook trout. She could see the fish, the kitchen, but she couldn’t see Fred’s face. The fog had lifted a little, giving her a better view of Maggie, though she still seemed exaggeratedly soft and pale. Augusta was a bit embarrassed that she had asked her new companion such a personal question.

“I never know where he is posted,” Maggie continued, “and he refuses to tell me.” She touched the blue paper at her waist again, as if to assure herself that it had not blown away, then wrapped the veil, which had unfurled in the wind, once more around her wrist. “I keep asking him where he is and he won’t tell me. He never was much of a talker, but this is ridiculous.”

“But he can’t tell you where his company is,” Augusta said. “It would be censored anyway, even if he did tell you.”

Maggie looked directly out into the fog. “We’ve known each other since we were children,” she said, determination in her voice. “I’ll keep writing until he tells me. Sometimes I stay up all night writing.”

Augusta sighed. “You should get your sleep instead. God knows there is little enough time for it.”

Maggie slowly unwrapped her veil from her arm, lifted it to her face, and burst into tears. “I’m quite mad,” she said, her voice choked with sobs. “I can’t seem to stop writing to him, even though I’m not sure he ever really liked me. Since we were children I was certain I was going to marry him.”

Augusta touched Maggie’s shoulder, tears coming into her own eyes. This pain was such an ordinary pain, she was suddenly filled with nostalgia. In peacetime two young women might have been having this conversation and one of them might be crying. Here in the fog, this girl with her white hair, her white apron and veil, her pale-blue uniform greyed by mist, looked almost like a photographic negative, as if she were already a memory. “At least you write to each other,” Augusta said sympathetically. “That’s something.”

“But he doesn’t answer … not since the Somme. I don’t think I know where he is. He hasn’t answered for two years.” Maggie had stopped crying now and was attempting to pin her veil back into place. She removed her cap from the bib of her apron. “He is impossible, you see.” She turned and smiled at Augusta. “I like it that you come out here,” she said. “I think we are going to be friends. I saw you walking out over the dunes all alone and I thought, That one will be my friend.”

Augusta’s hand was on the girl’s back, between her shoulder blades. She did not remove it. “Maggie,” she said, closing her eyes, “are you saying that Peter was at the Somme?” The Allied casualties there had been unlike anything experienced so far in the history of warfare. “Maggie,” she repeated, shaking the girl’s shoulder gently when she didn’t respond. “Was he wounded?”

“No,” Maggie said, looking at her cap, which she was turning around and around in her hands. “No, not that, I won’t let that happen.”

“Did something happen to him at the Somme?”

A silence, followed by, “I’m quite mad, you know.”

Fred was killed at Passchendaele, thought Augusta. Fred was not killed at Passchendaele. What is madness?

Maggie stood and Augusta looked up at her, so grey and ephemeral in the fog. Maggie crossed her arms. “I know I am off kilter, but there is nothing you can say to make me stop writing the letters. I came out here to meet you but also because I like to write the letters outside if I can, either that or in the dark.”

“We should be getting back,” said Augusta. “Matron here is fierce.”

As they walked over the dunes towards the hospital, Augusta told Maggie about the amphitheatre, how it had been there for centuries under the sand. The fog thickened again, but Augusta was able to orient herself by identifying certain groups of scrub pine that now and then erupted unexpectedly into her view. “How did you find your way out there?” she asked Maggie when they were on the path that led to the wards.

“I knew the direction and after a while I followed the sound of your voice.”

“I was saying things — out loud?”

“Enough for me to get near to where you were.”

They walked in silence for a few moments, their feet digging into the sand. “What did you hear me say?” Augusta eventually asked.

“You were saying something like ‘Fred is dead, Fred is not gone,’ then you said that thing about the birds.”

“The grey girl,” I said to Augusta, while snow blew through the metallic illumination created by the streetlights outside the China Hall.

“Yes,” she replied, “but I hadn’t thought of that yet.”

I was quite stunned by the audacity of what I had presumed, that and my sudden unquestioning belief in such a phenomenon. I remembered my mother telling me about the Rochester Rappings, but I knew this was different from all that.

“Nothing was certain in that world.” Augusta stood now, placed her hands on the small of her back, stretching her spine. “Each reality was perpetually being exchanged for another reality. And it was the spring of 1918. Stationary hospitals nearer the front were being transformed day by day, becoming casualty clearing stations, then advanced dressing stations, then preparing to evacuate altogether — the shelling was that bad, beyond all description. We received thousands and thousands of casualties. There were no more shifts, everyone just worked until they collapsed, then rose to their feet three hours later and began again. Maggie and I became quite close, almost immediately; there was never time in the war for developing a friendship gradually. We pushed her bed down the length of our quarters until it was near mine. But we were so busy we were hardly ever in the nurses’ quarters at the same time and, when we were, there was nothing, absolutely nothing, that could keep us awake for very long. I was administering anesthetic by then — they had to train some of the more experienced nurses as anesthetists — there just wasn’t enough staff.

“Sometimes Maggie and I went to the amphitheatre rather than to bed, just to remove ourselves for an hour from all the frantic activity. We never had any idea what time it was. Sometimes it was dark, sometimes it wasn’t. In the dark while we sat on the dunes Maggie and I could see battle fire in the distance. I remember her face flickering in that strange orange light. It was in the middle of all this, when we had stolen half an hour to go out to the amphitheatre, that she turned to me and said, ‘I am quite comfortable here, and you are too.’

“It was then that I recalled the little snow house and the grey girl and how she had said the same thing. I thought about how Maggie’s pale-blue uniform had appeared grey the morning that I met her in the fog. I didn’t question any of this. It seemed as valid to me as any other kind of reality. Besides, we understood each other, had become close friends. I thought the fact that I had hallucinated her, or imagined her, as a child spoke of a kind of predestiny. I didn’t tell her though. I wish now I had told her.”

“Did you ever tell George?”

“No, I never told George.”

After they had pushed their beds together at the far end of the nurses’ quarters, Augusta often heard the sound of Maggie’s pencil scribbling in the dark. Sometimes in the operating theatre while she was anesthetizing some poor broken boy, Augusta would see Maggie at the other side of the room where she was sterilizing instruments. Occasionally the blonde girl would stop for a few moments, pull the folded blue paper from her belt, and quickly jot down a few lines. No one else appeared to notice. Within a month of her arrival she was one of the most respected nurses in the hospital; her efficiency in the wake of the increasing chaos, a marvel to behold. The surgeons, even the matron, had nothing but praise for her.

But it was not this efficiency that caused Augusta to love Maggie Pierce. It was the way she refused to relinquish her own personal obsession, the letters she insisted on writing to her dead lover, and the way she posted them, by casually dropping them into the River Canche or by releasing them, like pigeons, out on the dunes in a wind that would carry them either into the line of battle or out to sea.

Anesthetic was beautiful to Augusta. It was only during its administration that she felt completely satisfied by what she was doing. Men howling in agony could be brought under her hands to a state of rest, calm entering their features so completely that she was able to recognize in their serene expressions the children they had been. Some boys were so desperate for unconsciousness that they tore the mask from her hands. “Please, Sister,” they would gasp, shout, or whisper, “put me to sleep, put me to sleep.” And behind them, stretching down the hall, a long line of the groaning wounded. It was a wonderful moment, she maintained, when a body in the clutch of pain finally relaxed — a warm tide of balm moving over the table.

By the last week in March of that year, the level of casualties was so high and so persistent that the surgeons and nurses were practically delusional from lack of sleep. Often everyone around the table wept — when an operation was successful and a life had been saved, or when it was unsuccessful and the boy died. From the corner where she was sterilizing instruments Maggie often sang “The Maple Leaf Forever,” moving into the more obscure verses, with lines such as “Then swell the song both loud and long, till rocks and forests quiver.” All this to make Augusta smile. Sometimes giddiness reigned at the most inappropriate times, when the surgeons found one of His Majesty’s buttons pushed by a bullet into a liver, or when after a successful four-hour operation to remove shrapnel from a brain, they discovered a deadly, malignant, and inoperable tumour just before they were about to close the skull. The boy died three days later, though whether from injuries or the tumour no one could really say. Sometimes when it was very quiet Augusta could hear Maggie scribbling in the corner, describing the previous operation and its results to her vanished lover.

In April, the number of wounded abated somewhat and, after long bouts of sleep, the fatigue began to lift. Maggie and Augusta were able to talk. Augusta told her friend all the things she told me, about her farm and her brothers, about her strict father and the snow house — leaving out the part about the grey girl — about her sampler, her Sunday-school cards. Very occasionally the girls shared a needle, but only when they were very tired and convinced that without it they would not have been able to carry out whatever task they had been called upon to complete. A different kind of exhaustion had them in its clutches now that they had slept off all the adrenalin brought about by the crisis. They walked on the dunes and visited the amphitheatre. Maggie continued to write the letters. Augusta continued to think about solid stone arches and benches, fluted columns and curved halls, stable and unchanging, tens of feet down. They promised each other they would be friends forever.

On a clear night in May, Augusta walked alone over the dunes to the amphitheatre. The moon was round and cold in the sky. There had been a dance a few days before in the nurses’ quarters to celebrate the fourth anniversary of the Number One Canadian Hospital, and both she and Maggie had been able to ignore the irony of a celebration long enough to have a good time. They had spent hours dancing with patients; some on crutches, some in wheelchairs, others who were unable to hold their partners because they had no arms. The atmosphere everywhere since then had been light and warm, the weather echoing this. Maggie had written to her dead lover about the feeling of camaraderie that surrounded her, and had shown Augusta the letter. “I feel I belong here now,” she had written, “and that you belong there, wherever you are.” Then she had wept a little, but not for long. She had made a special friend among the wounded soldiers.

As Augusta walked alone under the clear night sky, her inner voice chanted, “Fred is dead. Fred is not dead,” but it had become more like a melody one couldn’t shake from one’s mind than a painful announcement.

She knew the night was beautiful, and was sorry that Maggie was not with her, had chosen sleep instead, having begun her shift at four the previous morning.

A train clattered over the bridge on the River Canche. Its fire box was open and for a few moments the dunes turned an unearthly shade of orange because of this light, reminding Augusta, strangely, of a painting in her grandmother’s house that showed the first Canadian Houses of Parliament the night they burned to the ground. Then the dunes turned silver again in the moonlight, and Augusta settled herself down near the buried and permanent stone of the amphitheatre. Below her, the lights of the hospital complex were like the lights of a fashionable resort. Beneath the sand the memory of a constant, ordered world slept on.

She heard the planes before she knew what they were, assuming, until she saw most of the lights below her extinguish, that the noise was that of another hospital train arriving with wounded from the front. Then she heard the shrill song of the bombs. This disembodied noise seemed to go on for a long, long time, and reminded her of the whistle from the nearby canning factory where children were occasionally permitted to pull the cord that caused its high voice. Augusta had time to remember her brothers arguing over who would get first crack at it, time to wonder what on earth they had all been doing in the canning factory in the first place. Then she saw the only world she had come to understand shatter. At first she could not move, sat on the sand as if entranced. When the fires started they looked almost benign, tranquil, as if they had been lit on a beach for recreational purposes. The engines of the planes droned calmly into the distance.

Augusta worked that night in the miraculously undamaged operating theatre by the light of five candles, everyone having agreed that any more illumination would guarantee further attacks. Her shoes filled with sand as she ran towards the disaster. Every step had been a struggle, a treadmill nightmare, the dunes giving way under her feet. Her thighs still ached from the effort.

One by one the men were brought to the operating table, soldiers who had been torn apart in battle, sliced open just days ago by the surgeons, and who were now torn apart again. Among them were staff members from the hospital: orderlies, doctors, cooks, caretakers, ambulance drivers. Sometime during the night the moon moved into the window near where Augusta stood holding the black rubber mask over the face of a patient, making her hands look blue and cold. Just then the planes returned, and the bombing resumed, though this time the target was the base camps closer to town. Still, the force of this shook the hut and knocked over two of the candles, setting fire to a supply of bandages. Eight medical personnel rushed forward to extinguish the inconsequential blaze, as if by mastering this one problem they could somehow control the devastation around them.

It was far into the night when Maggie was brought into the room and lifted gently from a stretcher. Her beautiful fine hair was matted with blood, her legs and arms bent in ridiculous directions. One of her hands was missing. The surgeon began pacing up and down beside the table. “I don’t know where to start,” he was saying. “I don’t know where to start.”

Augusta heard herself shout, “Who is this? I want to know who this is?” And she was surprised by the sound of her own voice asking this question because she knew. She knew.

There was no sign of the girl’s left eye and her nose had been pushed sideways so that it lay against her cheek. Her faded blue-grey uniform was covered with blood.

“Re-tourniquet that arm!” the surgeon commanded.

“Don’t touch her!” Augusta heard herself yell.

“I’ll start with the head, then look for internal injuries,” said the surgeon. But the man did not move. He looked oddly at some kind of instrument in his hand. Candlelight quivered on the blade. “I haven’t operated on a woman since before the war,” he said to Augusta. And then, “My God, is she really alive?”

A medic touched Maggie’s wrist. “She’s alive,” he said.

The tune stopped playing in Augusta’s mind. Fred was dead.

The surgeon looked directly at Augusta. “Anesthetize her,” he ordered, anger in his voice.

“This can’t be Maggie,” she whimpered. “I don’t want to touch her face.”

The nurse on the other side of the table was crying, her sodden mask hanging heavy around her neck.

The doctor shook Augusta’s shoulder. “Anesthetize her!” he commanded.

Wincing, she brought the mask down over the broken face. For a fraction of a second she was back on the dunes at the moment when Maggie first emerged from the fog. That odd combination of greyness and radiance. Then she heard the sound of the saw. When the skull had been opened for some time, she touched the surgeons sleeve. “Doctor?” she said.

“I’m trying to save her,” he responded testily. “Though God knows why.”

The moon had gone down by now and the room was filled with the golden light of candles. A banquet hall. A basilica. Maggie’s blood made a sucking sound beneath Augusta’s sand-filled shoes.

Doctor? she had asked. God knows why, he had replied.

No one noticed when Augusta turned up the dial, causing the amount of diethyl ether to rise well above the level of safety. But by then, Augusta had redefined safety.

After that it seemed to Augusta that she was a child again standing in the slow rain of the interior of her snow house waiting for the grey girl to appear. The world she had so carefully constructed was dissolving around her and no golden light poured through the window. Shrinking before her very eyes, the white armchair remained cold and empty. The ice walls were streaming with moisture and the snow was soiled by mud.

I couldn’t even remember what she looked like,” she told me. “I had lost both the premonition and the memory of her physical presence, as if she had never existed, as if I had imagined her completely. This terrified me even more than the fact that she was dead. Everything about her was lost, utterly.”

Augusta had anesthetized two more boys and then, just as the dawn broke, the surgeon had made her leave the operating theatre.

“I’m sorry your friend died,” the doctor had said to her as she was untying her mask, “but there was nothing anyone could do.”

“No,” Augusta had agreed, “there wasn’t anything that anyone could do.”