Thus the last preparations had been completed and three days after our arrival at Earth the great fleet of space-fliers had taken its departure, the five thousand faceted polyhedron-like fliers rising as one from the flat roofs of New York's countless gigantic buildings. Once more we had started at night, and it seemed that all of the peoples of Earth had assembled in and around New York that night to speed us farewell. The vast crowds that had watched our single space-flier start out on its first trip weeks before, were as nothing to those vaster crowds that had watched the great fleet leave, since all on Earth knew now what word we had brought back from Neptune and knew that in two-score more days, unless this fleet was successful in its tremendous task, unless it could win through the Neptunian opposition and halt the giant sun-ray, that all on Earth would perish in flaming death. Thus surely there could have been no tenser moment in Earth's history than that, when, with the World President and the massed members of the World Congress watching again around us, our flagship had risen from the roof of the great World Government building into the night, flashing up and outward once more toward Sagittarius, toward unseen Neptune. And behind us almost instantly there had flashed up in regular timing and formation our five thousand following fliers, racing out and after us with colossal speed like ourselves and flying in that hollow triangle or V-formation behind us. That formation had been adopted so that the rays of the fliers of the fleet, driven back toward Earth to push them on, would not strike against other fliers behind them, as would have been the case had our fleet moved out in a compact mass. And now for forty-eight hours our five thousand space-fliers had been hurtling outward, with our own flagship still at the apex of their formation. And as we four sat now again in the four control-chairs, two of our mechanic-operators watching over the generators behind us and the other two asleep in their bunks, we had a somewhat different array of controls before us. Before myself were the controls of the flier itself, unchanged, with the six switches that directed its propulsion force-rays from the six openings. Marlin, though, to my right, had before him now as well as his array of astronomical instruments, the black mouthpiece and speaker of the radiophone, as well as a compact array of switch-studs by which he could speak to and hear from the various squadron-leaders in the great fleet behind us. For convenience in giving orders, the five thousand fliers of the fleet had been divided into fifty squadrons of a hundred space-fliers each, and it was to the designated leader of each squadron that Marlin gave his orders, which were then transmitted by that leader to the hundred fliers of his squadron.