Suddenly he pulled out; the four looked round. They were miles high; below half hidden in the dusk, were the red and brown roofs of a city. Far away on the horizon the battle still roared; a rolling cloud of smoke now, shot with the vivid fires of the American lightning flashes. The wings of their ship were spread; they were soaring gently earthward without the application of the rocket power. "Had to get away for a minute," Sherman explained. "We were heating up from the speed. My God, but we're high up; at least 45,000 feet!" "Yes, and getting higher," Ben pointed out. "Those green globes must be headed for the moon." "Do you know, I wouldn't be a bit surprised but what you're right," replied Sherman, "I'll bet an oil-ball against the whole Lassan city that they think we can't navigate space and they're trying to get above us and then hang around and pop us when we have to land. Well, come on gang, let's get back." He shot the wings in again, worked the controls, and they headed back toward the conflict. It was less of a turmoil now, more of an ordered swing, charge, pass and charge again against the diminishing number of the Lassan globes. Of the American rocket-ships Gloria could now count but two beside their own. One she had seen break up; whether the others, badly damaged, had hauled out for repairs, or whether, riven by the deadly yellow ray, they had gone crashing to the earth, there was no way of knowing. But the Lassans were not escaping unharmed; there were hardly a third as many as at the beginning and even as they approached another one disappeared in the vivid flash of the rocket's lightnings. Still the rest rose steadily on, going straight up as though they indeed hoped to escape their tormentors by rising to the moon. They dived in: Gloria pressed the lightning key and another Lassan globe blew up; then they were climbing again. Beneath them the night had come. The earth was a dark mass, far down, and from that enormous distance looked slightly dished out at the edges. But though the earth was dark, at that ultimate height of the atmosphere the sun had not yet set. Still the strange fight went on, higher and higher. The roar of the exhaust explosions died away behind them and Murray looked questioningly at Sherman. "Out this far, there isn't much air," he said. "Takes air to conduct sound. Wonder what they're up to, anyway. All right, Gloria." He dived at another Lassan and she pressed the lightning ray; but this time there was no flash, no flaming Lassan ship falling in ruins to the ground. "Who'd have thought it!" said Sherman, as he swung the _Monitor_ round after the charge. "Of course--we're up so high that we've made a spark gap that even lightning won't jump. But I don't get their idea; those sound rays won't be any good out here, either." CHAPTER XXIII Into the Depths