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The unicorn ripped the sod in deep furrows as it whirled back to Prentiss and the remaining rifleman; not turning in the manner of four-footed beasts of Earth but rearing and spinning on its hind feet. It towered above them as it whirled, the tip of its horn fifteen feet above the ground and its hooves swinging around like great clubs.

Prentiss shot again, his sights on what he hoped would be a vital area, and the rifleman shot an instant later.

The shots went true. The unicorn’s swing brought it on around but it collapsed, falling to the ground with jarring heaviness.

"We got it!" the rifleman said. "We——"

It half scrambled to its feet and made a noise; a call that went out through the night like the blast of a mighty trumpet. Then it dropped back to the ground, to die while its call was still echoing from the nearer hills.

From the east came an answering trumpet blast; a trumpeting that was sounded again from the south and from the north. Then there came a low and muffled drumming, like the pounding of thousands of hooves.

The rifleman’s face was blue-white in the starlight. "The others are coming—we’ll have to run for it!"

He turned, and began to run toward the distant bulk of the stockade.

"No!" Prentiss commanded, quick and harsh. "Not the stockade!"

The rifleman kept running, seeming not to hear him in his panic. Prentiss called to him once more:

"Not the stockade—you’ll lead the unicorns into it!"

Again the rifleman seemed not to hear him.

The unicorns were coming in sight, converging in from the north and east and south, the rumble of their hooves swelling to a thunder that filled the night. The rifleman would reach the stockade only a little ahead of them and they would go through the wall as though it had been made of paper.

For a little while the area inside the stockade would be filled with dust, with the squealing of the swirling, charging unicorns and the screams of the dying. Those inside the stockade would have no chance whatever of escaping. Within two minutes it would be over, the last child would have been found among the shattered shelters and trampled into lifeless shapelessness in the bloody ground.

Within two minutes all human life on Ragnarok would be gone.

There was only one thing for him to do.

He dropped to one knee so his aim would be steady and the sights of his rifle caught the running man’s back. He pressed the trigger and the rifle cracked viciously as it bucked against his shoulder.

The man spun and fell hard to the ground. He twisted, to raise himself up a little and look back, his face white and accusing and unbelieving.

"You shot me!"

Then he fell forward and lay without moving.

Prentiss turned back to face the unicorns and to look at the trees in the nearby grove. He saw what he already knew, they were young trees and too small to offer any escape for him. There was no place to run, no place to hide.

There was nothing he could do but wait; nothing he could do but stand in the blue starlight and watch the devil’s herd pound toward him and think, in the last moments of his life, how swiftly and unexpectedly death could come to man on Ragnarok.

* * *

The unicorns held the Rejects prisoners in their stockade the rest of the night and all the next day. Lake had seen the shooting of the rifleman and had watched the unicorn herd kill John Prentiss and then trample the dead rifleman.

He had already given the order to build a quick series of fires around the inside of the stockade walls when the unicorns paused to tear their victims to pieces; grunting and squealing in triumph as bones crushed between their teeth and they flung the pieces to one side.

The fires were started and green wood was thrown on them, to make them smoulder and smoke for as long as possible. Then the unicorns were coming on to the stockade and every person inside it went into the concealment of the shelters.

Lake had already given his last order: There would be absolute quiet until and if the unicorns left; a quiet that would be enforced with fist or club wherever necessary.

The unicorns were still outside when morning came. The fires could not be refueled; the sight of a man moving inside the stockade would bring the entire herd charging through. The hours dragged by, the smoke from the dying fires dwindled to thin streamers. The unicorns grew increasingly bolder and suspicious, crowding closer to the walls and peering through the openings between the rails.

The sun was setting when one of the unicorns trumpeted; a sound different from that of the call to battle. The others threw up their heads to listen, then they turned and drifted away. Within minutes the entire herd was gone out of sight through the woods, toward the north.

Lake waited and watched until he was sure the unicorns were gone for good. Then he ordered the All Clear given and hurried to the south wall, to look down across the barren valley and hope he would not see what he expected to see.

Barber came up behind him, to sigh with relief. "That was close. It’s hard to make so many people stay absolutely quiet for hour after hour. Especially the children—they don’t understand."

"We’ll have to leave," Lake said.

"Leave?" Barber asked. "We can make this stockade strong enough to hold out unicorns."

"Look to the south," Lake told him.

Barber did so and saw what Lake had already seen; a broad, low cloud of dust moving slowly toward them.

"Another herd of unicorns," Lake said. "John didn’t know they migrated—the Dunbar Expedition wasn’t here long enough to learn that. There’ll be herd after herd coming through and no time for us to strengthen the walls. We’ll have to leave tonight."

* * *

Preparations were made for the departure; preparations that consisted mainly of providing each person with as much in the way of food or supplies as he or she could carry. In the 1.5 gravity, that was not much.

They left when the blue star rose. They filed out through the northern gate and the rear guard closed it behind them. There was almost no conversation among them. Some of them turned to take a last look at what had been the only home they had ever known on Ragnarok, then they all faced forward again, to the northwest, where the foothills of the plateau might offer them sanctuary.

They found their sanctuary on the second day; a limestone ridge honey-combed with caves. Men were sent back at once to carry the food and supplies left in the stockade to the new home.

They returned, to report that the second herd of unicorns had broken down the walls and ripped the interior of the stockade into wreckage. Much of the food and supplies had been totally destroyed.

Lake sent them back twice more to bring everything, down to the last piece of bent metal or torn cloth. They would find uses for all of it in the future.

* * *

The cave system was extensive, containing room for several times their number. The deeper portions of the caves could not be lived in until ventilation ducts were made, but the outer caves were more than sufficient in number. Work was begun to clear them of fallen rubble, to pry down all loose material overhead and to level the floors. A spring came out of the ridge not far from the caves and the approach to the caves was so narrow and steep that unicorns could scramble up it only with difficulty and one at a time. And should they ever reach the natural terrace in front of the caves they would be too large to enter and could do no more than stand outside and make targets of themselves for the bowmen within.

Anders was in charge of making the caves livable, his working force restricted almost entirely to women and children. Lake sent Barber out, with a small detachment of men, to observe the woods goats and learn what plants they ate. And then learn, by experimenting, if such plants could be safely eaten by humans.