It struck with a shattering crash some distance away, but one pair of eyes failed to follow it in its fall. For in the clear air above, with the golden light of distant clouds upon it, a roaring monster of silvery sheen had rolled and swept upward to the heights. And it showed, as it turned, a painted emblem on its bow, a design of clear-cut color, unbelievably familiar--a circle of blue, and within it a white star and a bull's eye of red--the mark of the flying service of the United States! * * * * * McGuire never knew how he got Althora and himself back to the building whence he had come. Nor did he see the struggling figures on a balcony, or the leap and fall of a maimed body, where Professor Sykes, when the door had yielded, found surcease and oblivion on the pavement below. He was to learn that later, but now he had eyes only for a sight that could be but a dream, an unreal vision of a disordered brain. He held the slim form of Althora to him in a crushing grip, while he stared, dry-eyed, above, and his own voice seemed to shout from afar off: "They're ours!" that voice was screaming in a frenzy of exultation. "They're our ships! They've come across!" The fighting fleet of the red man-things of Venus was taking to the air! The ships rose in a swarm of speeding, darting shapes, and the great one of Torg was in the lead, climbing in fury toward the heights. Far above them the clouds of gold silhouetted a strange sight, and the air was shaking with the thunder from on high, where, straight and true, a line of silver ships in the sharp V of battle formation drove downward in a deadly, swift descent. And even afar off, the straining eyes of a half-crazed man could see the markings on their bow--a circle and a star--and the colors of his own lost fighters of the air. CHAPTER XIX The Earth-fleet was a slanting line of swiftness that swept downward from the clouds. A swarm of craft was rising from below. The red-striped fighters met the attack first with a cloud of gas. The scarlet monster--the flagship of Torg, the Emperor--was in the lead, and they shot with terrific speed across the bows of the oncoming fleet to leave a whirlwind of deadly vapor as they passed. McGuire held his breath in an agony of fear as the cloud enveloped the line of ships, but their bow guns roared staccato crashes in the thunder of their exhausts as they entered the cloud. And they were firing from the stern as they emerged, while two falling cylinders of red and white proved the effectiveness of their fire. The formation held true as it swept upward and back where the swarming enemy was waiting. They were outnumbered three to one, McGuire saw, and his heart sang within him as he watched the sharp, speeding V that climbed upward to the enemy's level then swung to throw itself like a lance of light at the massed ships that awaited the attack.