He aimed a little in front of them and began blasting. A wing flew from one of the aircraft, and it plunged downward. Another came apart in the air; a third burst into flames. The other two zoomed upward quickly. Hradzka swung his blaster after them, blasting again and again. He hit a fourth with a blast of energy, knocking it to pieces, and then the fifth was out of range. He blasted at it twice, but without effect; a hand-blaster was only good for a thousand yards at the most. Holstering his weapon, he hurried away, following the stream and keeping under cover of trees. The last of the attacking aircraft had gone away, but the little scout-plane was still circling about, well out of blaster-range. Once or twice, Hradzka was compelled to stay hidden for some time, not knowing the nature of the pilot's ability to detect him. It was during one of these waits that the next phase of the attack developed. It began, like the last one, with a distant roar that swelled in volume until it seemed to fill the whole world. Then, fifteen or twenty thousand feet out of blaster-range, the new attackers swept into sight. There must have been fifty of them, huge tapering things with wide-spread wings, flying in close formation, wave after V-shaped wave. He stood and stared at them, amazed; he had never imagined that such aircraft existed in the First Century. Then a high-pitched screaming sound cut through the roar of the propellers, and for an instant he saw countless small specks in the sky, falling downward. The first bomb-salvo landed in the young pines, where he had fought against the first air attack. Great gouts of flame shot upward, and smoke, and flying earth and debris. Hradzka turned and started to run. Another salvo fell in front of him; he veered to the left and plunged on through the undergrowth. Now the bombs were falling all about him, deafening him with their thunder, shaking him with concussion. He dodged, frightened, as the trunk of a tree came crashing down beside him. Then something hit him across the back, knocking him flat. For a moment, he lay stunned, then tried to rise. As he did, a searing light filled his eyes and a wave of intolerable heat swept over him. Then darkness... * * * * * "No, Zarvas Pol," Kradzy Zago repeated. "Hradzka will not return; the 'time-machine' was sabotaged." "So? By you?" the soldier asked. The scientist nodded. "I knew the purpose for which he intended it. Hradzka was not content with having enslaved a whole Solar System: he hungered to bring tyranny and serfdom to all the past and all the future as well; he wanted to be master not only of the present but of the centuries that were and were to be, as well. I never took part in politics, Zarvas Pol; I had no hand in this revolt. But I could not be party to such a crime as Hradzka contemplated when it lay within my power to prevent it."