He waited half an hour, and returned. From a distance the telectroscope told him that one lone ship was patrolling outside the fort. He moved toward it, creeping up behind the icy mountains. His magnetic beam reached out. The ship lurched and fell. The magnetic beam reached out toward the fort, from which a molecular ray had flashed already, tearing up the icy waste which had concealed him. The ray-screen stopped it, while again Morey turned the magnetic beam on--this time against the fort. The ray remained on! Arcot retreated hastily. "They found the secret, all right. No use, Morey, come on up," called the pilot. "They evidently put magnetic shielding around the apparatus. That means the magnetic beam is no good to us any more. They will certainly warn every other base, and have them install similar protection." "Why didn't you try the magnetic ray on our first attack?" asked Zezdon Afthen. "If it had worked, their sending apparatus would have been destroyed, and no message could have been sent to call their attackers off Fellsheh. By forcing them to recall their fleet I got results I couldn't get by attacking the fleet," Arcot said. "I think there is little more I can do here, Stel Felso Theu. I will take you to Shesto, and there make final arrangements till my return, with apparatus capable of overthrowing your enemies. If you wish to accompany me--you may." He glanced around at the others of his party. "And our next move will be to return to Earth with what we have. Then we will investigate the Sirian planets, and learn anything they may have of interest, thence--to the real outer space, the utter void of intergalactic space, and an attempt to learn the secret of that enormous power." They returned to Shesto, and there Arcot arranged that the only generator they could spare, the one already in their possession, might be used till other terrestrian ships could bring more. They left for Earth. Hour after hour they fled through the void, till at last old Sol was growing swiftly ahead of them, and finally Earth itself was large on the screens. They changed to a straight molecular drive, and dropped to the Vermont field from which they had taken off.