They swept at full speed toward the warships, four of which had by this time been sent to destruction—one of which had appeared to vanish utterly in the space of a single heartbeat, so quickly that for a second or two the shape of its bilge, the bulge of its keel, was visible in the face of the deep—and openly challenged the aero-subs.
Muzzles of compressed air guns projected from the wing-tips of the planes. Buttons were pressed which elevated the muzzles of guns arranged to fire upward from either side the fighting pits, twin guns that were fired downward from the same central magazine—the only guns in use in the Americas which fired in opposite directions at the same time.
But for a few moments the aero-subs refused combat. Their speed was terrific, dazzling. They eluded the thrusts, the dives and plunges of the American ships as easily as a swallow eludes the dive of a buzzard.
It came to Prester Kleig, however, that the aero-subs were merely playing with the Americans; that when they elected to move, the planes would be blasted from the sky as easily as the warships were being erased from the surface of the Atlantic.
One by one, as methodically as machines, the aero-sub pilots blasted the warships into nothingness. They had their orders, and they went about their performance with a rigidity of discipline which astounded the Secret Agents. They had been ordered to destroy the warships, and they were doing that first—would go on to completion of this task, no matter how many American planes buzzed about their ears.
But one by one as the warships sank, the aero-subs which had either sunk or erased them made the surface and leaped into space with a snapping back of wings that was horribly businesslike as to sound, and climbed up to take part in the fight against the American planes, which must inevitably come.
The last warship, cut squarely in two from stem to stern along her center, as though split thus by a bolt of lightning, fell apart like pieces of cake, and splashed down, sinking away while the spume of her disintegration rolled back from her fallen sides in white-crested waves.
"It exemplifies the policies of Moyen," said Prester Kleig, "for his conquest of the world is a conquest of destruction."