 Why would the Furry Ones not follow Rolf and the others when the retreated?
THE HAIRY ONES by BASIL WELLS Marooned on a world within a world, aided by a slim girl and an old warrior, Patrolman Sisko Rolf was fighting his greatest battle—to bring life to dying Mars. [Transcriber's Note: This etext was produced from Planet Stories Winter 1944. Sisko Rolf's stocky body was a blur of motion as he cut the rocket jets, doused the twin searchlights, and switched over to the audio beams that served so well on the surface when blind flying was in order. But here in the cavern world, thirty-seventh in the linked series of vast caves that underlie the waterless wastes of Mars, the reflected waves of sound were of little value. "Trapped us neatly," Rolf said through clenched teeth. "Tolled into their underground hideout by that water-runner we tried to capture. They know these caverns better than.... Then a barrage of enemy rocket shells exploded into life above and before them. Rolf swung the lax controls over hard as the bursts of fire revealed a looming barrier of stone dead ahead, and then he felt the tough skin of the flyer crumple inward. In a slow sort of wonder Rolf felt the scrape of rock against metal, and then the screeching of air through the myriad rents in the cabin's meralloy walls grew to a mad whining wail. Down plunged the battered ship, downward ever downward. Somehow Rolf found the strength to wrap his fingers around the control levers and snap on a quick burst from the landing rockets. Their mad speed checked momentarily, but the nose of the vertically plunging ship dissolved into an inferno of flame. The ship struck; split open like a rotten squash, and Rolf felt himself being flung far outward through thick blackness. Much later Rolf groaned with the pain of bruised muscles and tried to rise. There was light in the narrow pit in which he found himself, light and heat from the yet-glowing debris of the rocket flyer. The outlaws had blasted the crashed ship, his practiced eyes told him, and Garmon Nash must have died in the wreckage.
 They feared the Ancients.
 They had lost too many to continue fighting.  They were warned not to by Altha.  They feared the Ancients.  They knew they were losing the battle.