They found no injured; only the dead. The prowlers killed with grim efficiency. * * * * * "John----" John Chiara, the young doctor, hurried toward him. His dark eyes were worried behind his frosted glasses and his eyebrows were coated with ice. "The wood is soaked," he said. "It's going to be some time before we can get fires going. There are babies that will freeze to death before then." Prentiss looked at the prowlers lying in the snow and motioned toward them. "They're warm. Have their guts and lungs taken out." "What----" Then Chiara's eyes lighted with comprehension and he hurried away without further questions. Prentiss went on, to make the rounds of the guards. When he returned he saw that his order had been obeyed. The prowlers lay in the snow as before, their savage faces still twisted in their dying snarls, but snug and warm inside them babies slept. * * * * * The prowlers attacked again and again and when the wan sun lifted to shine down on the white, frozen land there were five hundred dead in Prentiss's camp: three hundred by Hell Fever and two hundred by prowler attacks. Five hundred--and that had been only one night on Ragnarok. Lake reported over six hundred dead. "I hope," he said with bitter hatred, "that the Gerns slept comfortably last night." "We'll have to build a wall around the camp to hold out the prowlers," Prentiss said. "We don't dare keep using up what little ammunition we have at the rate we've used it the last two nights." "That will be a big job in this gravity," Lake said. "We'll have to crowd both groups in together to let its circumference be as small as possible." It was the way Prentiss had planned to do it. One thing would have to be settled with Lake: there could not be two independent leaders over the merged groups. Lake, watching him, said, "I think we can get along. Alien worlds are your specialty rather than mine. And according to the Ragnarok law of averages, there will be only one of us pretty soon, anyway." All were moved to the center of the camp area that day and when the prowlers came that night they found a ring of guards and fires through which they could penetrate only with heavy sacrifices. There was warmth to the sun the next morning and the snow began to melt. Work was commenced on the stockade wall. It would have to be twelve feet high so the prowlers could not jump over it and, since the prowlers had the sharp claws and climbing ability of cats, its top would have to be surmounted with a row of sharp outward-and-downward projecting stakes. These would be set in sockets in the top rail and tied down with strips of prowler skin.