When the Earthians had eased themselves into their heavy protecting attire, Telaba led the way down a spiral stair and through an air lock, out into the open. Here everything was grim silent activity. Group after group of mounted Space Men poured skyward. Telaba's army was a mighty thing; with luck it might have beat down the resistance of either one of the two planets. But when compared with Alkebar's colossal horde, it paled into pitiful insignificance. Nearby, a space disc, which must have measured fully two hundred feet in diameter, rested. The three mounted the light ladder which led to the interior. In the metal walls were mounted two heat-ray projectors of Martian design, as well as several torpedo catapults and machine guns. Two Space Men were inspecting them. Telaba signaled to the driver who knelt with lever in hand. The great disc trembled and the propelling force which no human being had yet learned how to produce, sent it and its burden hurtling toward the stars. The minions of the rebel chief circled and swirled about their commander's ship in wild soundless salute. Telaba was operating the signaling mechanism which fired lights of various colors up through the roof of the armored coach, and in reply to his flashing commands, his horde formed a monster cone which shot with ever increasing speed through the void. A sickening giddiness came over the two Earthians, for there were no devices to produce artificial gravity here. It was the space nausea which had made early interplanetary travel such a nightmare. The Star People, born where gravity is almost unknown, were of course not affected in the least. Clinging to stanchions and hand grips to keep themselves from floating free, Janice Darell and Austin crept about the floor examining the weapons and scanning space ahead for signs of the enemy. They disliked to admit to each other that they were very sick; but if they thought that it was possible to forget the retching pains in their stomachs by diligent devotion to other things, they were mistaken. Their suffering continued until Jan remembered that the force of this almost forgotten malady could be reduced by lessening the amount of oxygen taken into the lungs. A few turns of the intake valves of their helmets accomplished this, and they soon felt much better. It was a long time before there were any indications of the near presence of the enemy. Ahead, two asteroids glowed, a dull red. One was quite close; the other farther away. It was Shelby, peering steadily through his binoculars, who first discovered the glowing cloud, thin and faint like the nebulous substance of the Milky Way, pouring up like ghosts' hair from the rounded pate of the nearer asteroid. He knew that it was made up of countless points of light, too small to be detected individually. Not long afterward Telaba discovered a similar cloud coming from the second of the minor planets.