slow circling.

The

"You see," Dorle said, "it noticed the rock, as soon as I threw it up in the air. It's alert to anything that flies or moves above the ground level. Probably it detected us as soon as we entered the gravitational field of the planet. It probably had a bead on us from the start. We don't have a chance. It knows all about the ship. It's just waiting for us to take off again."

"I understand about the rock," Nasha said, nodding. "The gun noticed it, but not us, since we're on the ground, not above. It's only designed to combat objects in the sky. The ship is safe until it takes off again, then the end will come."

"But what's this gun for?" Tance put in. "There's no one alive here. Everyone is dead."

"It's a machine," Dorle said. "A machine that was made to do a job. And it's doing the job. How it survived the blast I don't know. On it goes, waiting for the enemy. Probably they came by air in some sort of projectiles."

"The enemy," Nasha said. "Their own race. It is hard to believe that they really bombed themselves, fired at themselves."

"Well, it's over with. Except right here, where we're standing. This one gun, still alert, ready to kill. It'll go on until it wears out."

"And by that time we'll be dead," Nasha said bitterly.

"There must have been hundreds of guns like this," Dorle murmured. "They must have been used to the sight, guns, weapons, uniforms. Probably they accepted it as a natural thing, part of their lives, like eating and sleeping. An institution, like the church and the state. Men trained to fight, to lead armies, a regular profession. Honored, respected."

Tance was walking slowly toward the gun, peering nearsightedly up at it. "Quite complex, isn't it? All those vanes and tubes. I suppose this is some sort of a telescopic sight." His gloved hand touched the end of a long tube.

Instantly the gun shifted, the barrel retracting. It swung—

"Don't move!" Dorle cried. The barrel swung past them as they stood, rigid and still. For one terrible moment it hesitated over their heads, clicking and whirring, settling into position. Then the sounds died out and the gun became silent.

Tance smiled foolishly inside his 

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