In the Year of our Lord 1345. . . .The mighty Wersgorix, undisputed rulers of outer space, landed upon Earth in their search for new worlds to conquer. Their ships carried guided missiles and thermonuclear devices, but they had long since forgotten how to use the weapons necessary for hand-to-hand fighting. Thus they were easy prey for a band of knights armed with broadswords and battleaxes.. But it was a victory won by surprise and it was only temporary. The invaders were thousands of years ahead of Earth scientifically, and could be expected to exact a severe revenge upon the despoilers of their people. So there was nothing else to do but take the crusade to the aliens before they came to destroy Earth . . . The real first edition of this delightful romp, as a magazine serial.