But before he could finish the sentence, before our space-fliers could whirl upward in answer to his command, from the Neptunian cylinders massed above us had shot down upon us innumerable powerful propulsion-rays, rays that struck scores, hundreds, of our space-fliers and drove them down with terrific force to crash against the metal roof of Neptune beneath us! They were repeating the maneuver by which we four had escaped from our pursuers over Neptune weeks before, were driving our fliers down to crashing death in hordes! Instantly as Marlin shouted into the order-mouthpiece, our fliers leaped forward, to escape from that death that smote us from above, but as we drove forward in our column formations again, they went on above us, were with their powerful propulsion-rays driving us down to death in scores even as with those rays they prevented us from rising to meet them! We were being quickly destroyed now, and as we saw it, as our column flashed on with the Neptunian cylinders massing in another column above and driving our fliers down by scores, we saw that not much longer could that unequal battle continue! Then abruptly Marlin pointed ahead and downward to Neptune's mighty roof beneath us, was crying an order to us and the fliers behind and about us.
"That opening!" he cried. "Down through it—down beneath the roof! It's our one chance to escape them!"
I caught my breath at that cry of his, for I saw that he was pointing down toward one of the great circular openings in Neptune's roof, openings that were set in it here and there, all being open now as when we had first explored Neptune's mysteries. To flash down beneath the roof through that opening was our one chance of escape from the relentless smiting death above. I saw it, too, so the next instant our own flier and all the long column behind us were diving downward at a dizzying angle toward that great circular opening; and in the next moment before the Neptunian cylinders above could fathom our purpose, we had passed through that opening and were racing forward beneath the great roof! In an instant, though, the Neptunian cylinders had followed in their long column and were racing after us, through the dim Neptunian day above the dead and lifeless surface of the great compartment-city that covered all of Neptune!
On we flashed, with the Neptunian column some distance behind, numbering now some half-thousand more in cylinders than our own bare thousand space-fliers. On until above us we saw another similar opening in the great roof, and then at Marlin's quick order our narrow, long column of fliers were slanting up toward it, through it. And then, outside of the great roof once more, Marlin gave a swift order that revealed to me the purpose of his strategy. For at that order our fleet checked its upward rush and bent its long column lightning-like around to form a great circle, a circle hovering there around and above the great circular opening in the roof through which we had just emerged. And in the next moment, as the Neptunian column flashed up through that opening likewise in hot pursuit of us, never suspecting us of waiting there for it, from all the fliers of our great circle there had radiated toward them storm on storm of deadly concentrated rays, rays that smote them with blinding shock as their column rushed upward and that crashed through hundreds of their upflashing cylinders even as they burst up through the opening, before ever they could catch sight of us around them! In those seconds of dazing surprise there was no chance for them to recoil, and their column of cylinders, as if too astounded for the moment to answer with a single ray, was flashing up from the opening through a hurricane of rays that in that moment was annihilating their cylinders by hundreds! But a scant three or four hundred cylinders of those that ran upward through that gauntlet of death escaped it, and these swirled for a moment in stunned confusion above us, and then were without formation racing away from us over Neptune's surface, racing away toward the gleaming disk of Triton!
"Beaten!" I cried, as our own space-fliers whirled up now after the fleeing cylinders. "They're beaten—they're fleeing back to Triton!"
"The giant ray!" Whitely was shouting, as we thundered forward. "We've still more than a thousand fliers left, and if we can get now to that great sun-ray——!"
"Hold steady after them!" Marlin cried. "We've fought our way this far, and we've got now to get to that ray and halt it!"
Now out over Neptune's surface, out through its mists and outer atmosphere again, the cylinders ahead were roaring at utmost speed, almost leaping in a confused and disorganized mass, the remnants of that mighty fleet that had come out to meet us outside Neptune, toward their moon-world of Triton, whose disk gleamed bright ahead. A thrill of pride even in our wild excitement shot through me as we thundered on in pursuit of those fleeing cylinders. For whatever else that day might hold for us, whether or not we were able to halt that giant ray on Triton's sunward side that was reaching out to the sun and turning it ever faster, we men of Earth had at least proved our fighting ability to the solar system for all time, had come out to the solar system's edge and had shattered there the mighty armada of the Neptunians' ancient and mighty race! And now as we flashed on in swift pursuit of the fleeing survivors of that armada toward Triton, confidence and hope were strengthening in us each moment, for with the Neptunians' great fleet shattered what could hold us back from the shattering and halting of the giant sun-ray and its mechanism?
On—on—and now we were rushing after the fleeing cylinders out of Neptune's atmosphere and into the airless void again, with Triton growing each moment more bright and big as giant Neptune fell behind us. Across the gulf from Neptune to its moon we sped, after those cylinders, with utmost acceleration and speed, and swiftly we drew closer to the Neptunians flying before us, and swiftly too drew closer to the gleaming sphere of Triton. And as it grew larger before us, as we pursued the cylinders in toward it, we all cried out as we followed with our eyes at the sunward side of it the giant pale beam, hardly visible, of the colossal force-ray acting on the sun, that mighty ray that was turning the sun ever faster to the doom of the solar system! We could make out that gigantic beam, leaping out into space toward the distant fire-disk of the sun, and could make out also in that moment a great number of great humped dark shapes gathered on Triton's roof around the great pit of the sun-ray. As our eyes shifted to Triton's other edge we could discern the other giant force-ray, which reached out toward the distant star in Sagittarius and by bracing Triton with its pressure kept the moon-world from being hurled out into space by the sun-ray's pressure. Around this other ray's pit, too, were a few of the strange great humped or domed dark shapes, but in that moment we gave them small attention, for the cylinders that had been fleeing from before us straight toward the great sun-ray's giant beam, had abruptly slowed, stopped, as they rushed into Triton's atmosphere, and had turned desperately to face us!