Dawn on the Red Plain was a thin, pale thing, the color of old bone.
Along the length of the Wall, in two long ranks that faced one another across the road, the ten thousand of the Seventh Banner stood at attention with their spears grounded. They made no sound. The beacon fires on the cliffs burned low. On the plain below, in a wide half-circle, three hundred riders of the Ash Horde sat their shaggy ponies in perfect silence, with their bows slung and their faces painted with ash.
Between the two armies, the great gate of Iron Pass stood open.
In the center of the gateway stood Gu.
Tie Shan had found him a coat. It was black wool, heavy and old, with the wolf-head of the Western Army worked in tarnished silver at the clasp, and it hung on him as though it had been waiting. He had washed. He had combed his gray beard. He wore the whole wolf’s head tally at his belt, and his shoulders were straight, and there was no gourd anywhere about his person at all.
Li Xuan stood a little behind him, with his broom on his shoulder. He had thought to offer a hand to steady the old man. He saw, now, that it was not needed.
A single figure rode out from the line of the Horde.
Tuoba Yue came on a gray mare at a walk. She wore her plain gray coat, and her sabre was sheathed at her side, and she carried no bow. At fifty paces from the gate, she swung down from her saddle and gave the reins to Temur, who had followed behind. Then she walked on alone, with the dust rising about her boots.
She stopped at the threshold, where the iron plates of the gate met the road.
She and Gu looked at one another for a long time.
"Tuoba Yue," said Gu. His voice was low and entirely steady. "I am Gu Changfeng. I am the man who poured the wine."
"I know who you are." Her voice was as flat as before. "My grandmother cursed your name every night until she died."
"She was right to."
He went down on one knee.
There was a murmur from the ranks of the Horde. Gu bent forward slowly, until his forehead touched the stone of the road, in the oldest and humblest obeisance that men of the border knew.
"I swore an oath for thirty thousand men," he said, to the stone. "I thought it was a shield. It was a lock, and before I knew its teeth, it burned a hundred thousand of yours. I cannot give them back. I do not ask your forgiveness. I only wish you to know that I have heard them every night for fifty years."
The wind blew a little dust across the road.
Tuoba Yue stood very still. Her face did not change, but Li Xuan, watching, saw her hands curl slowly into fists at her sides.
"Your oath burned my grandfather’s people," she said. "Your Wall killed my father. I will not forgive you, Marshal. I do not have it in me."
"I know."
"But I can stop."
She put one foot over the threshold.
Then the other.
There was a low, soft sound, like the intake of a thousand breaths. The ranks of the Seventh did not move, but the cold blue light about them flickered. Tie Shan, standing at the head of his banner with his helm under his arm, bowed his head.
"The gate is opened to the Khan’s blood," Tuoba Yue said, loudly enough that the Horde could hear. "By the hand of the Marshal who may open it. The vow is kept." Her voice cracked on the last word, only a little, and she lifted her chin. "It is ended."
Old Hulan began to sing.
It was a very old song, in a tongue Li Xuan did not know, low and wavering and full of long, falling notes, and it rose from the old woman’s thin chest and across the dust like the cry of a bird. One by one, the riders of the Ash Horde swung down from their ponies. One by one, they unslung their bows and laid them on the ground. A hundred. Two hundred. Three. And as each bow touched the earth, a small white light, no bigger than a candle flame, rose from the dust near it, and drifted up toward the sky.
Temur wept without shame. A little apart from the others, Tuoba Kui stood with his axe grounded and his heavy face turned to the east. He did not dismount. But neither did he ride away.
Gu rose, unsteadily, and wiped his face upon his sleeve.
"The Western Reaches," he said then, hoarsely, to the girl before him. "East of the Wall, four hundred li of empty land. The soil was good once. The wells, if they are cleared, will run. The Marshal of the West has the right to grant settlement there to anyone who will plow it and watch the Pass."
Yue’s gray eyes narrowed. "A grant from a man the throne has forgotten."
"A grant," said Gu, "with ten thousand dead men standing behind it."
On the wall above them, the Seventh Banner lifted its spears, once, in salute.
Tuoba Yue looked up at the ranks of ghosts, and the ghosts, in their pale armor, looked down at her. She turned her head slowly, as though she were seeing them for the first time.
"Boys," she said, very quietly.
"Aye," said Gu.
The Khan’s granddaughter pressed her lips together. She drew her sabre, slowly, and laid it across the threshold of the gate, and stepped back.
Gu took the tally from his belt. He set the whole wolf’s head upon the blade, bronze on steel, and bowed.
"The Marshal and the Khan," he said. "Until the dark of the moon is only a moon."
They left by noon.
Tie Shan walked beside the cart as far as the end of the road, with his helm back upon his head. "Marshal," he said, and then stopped, as though he did not know how to go on. "I have not had an order in fifty years."
"I have one for you." Gu sat on the cart bench with his hands on his knees, in the old black coat. "At the first snow, I will light the beacon on Spirit Hill, outside the capital. The chain of towers will carry it west in a night. When it reaches you, march. A thousand, no more."
"A thousand." The captain’s blank eyes seemed to burn a little brighter. "They will want to go home, Marshal. All of them."
"Then we will take them home," said Gu, "every one."
Li Xuan took a single slender stick from his sleeve and held it out. "For the night before you march. Light it at the gate tower. It will not release you. But it may let you sleep."
Tie Shan took it in both hands. He did not say anything. He bowed to Li Xuan, very low, as a soldier bows to a commander, and stepped back.
Tuoba Yue was waiting at the edge of the road, with her gray mare behind her. She came forward and put something in his hand. It was a small, smooth piece of yellowed bone, carved with the ash-brand of the Horde: a wolf’s head with a crescent over its brow.
"A guest-bone," she said. "Show it to any rider of the Ash Horde, and you will be a guest at his fire." She looked at the broom, and the cart, and the donkey, who stared back at her with profound contempt. "I do not know what you are, Sweeper. I do not think you know either. But I will remember the tea."
"There is more," said Li Xuan, "if you come to the capital after the first snow."
"I will think on it." The ghost of a smile crossed her face and was gone. "Tell your donkey that he is a very good judge of character."
Tax Collector flicked an ear, as one who has heard it all before.
The cart creaked off down the road toward the east. Behind them, on the wall, ten thousand dead stood in two long ranks against the sky, and did not move, and did not look away, until the road dipped into the hills and the Pass was gone.
Li Xuan sat beside Gu, with the guest-bone warm in his palm, and thought of what he had read in the Vault, on the black stone of a bare dais, in four words that no one had asked him to remember.
Return what you borrow.
The Marshal had returned the wine. It had taken him fifty years.
"Boy," said Gu, very softly.
"Senior?"
The old man was staring east, along the empty road, his clouded eyes narrowed to slits.
"Look."
Far away on the horizon, three hundred li off, a single point of light had kindled upon the crest of a distant hill. It was not blue, like the Pass’s torches. It burned a deep, hard red, and as they watched, a second point flared up beyond it, and a third, one by one, in a long, quick chain, each leaping across the miles to the next, running from the east toward the Wall.
"That is the Throne’s fire," said Gu.
He did not say anything else for a long while.
"The Ancestors have felt the oath stir," he said at last. "They know the tally has been joined. They are calling for the Western Army to come home." His clouded eyes turned slowly to Li Xuan, and his voice was very quiet. "Boy, I think we are going to be late for the dark of the moon."