[Transcriber Note: This etext was produced from IF Worlds of Science Fiction May 1954. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] The Horde of sleek ships arose in the west at twilight—gleaming slivers that reflected the dying sun as they lanced across the darkling heavens. A majestic fleet of squadrons in double-vees, groups in staggered echelon, they crossed the sky like gleaming geese, and the children of Earth came out of their w