Fletcher Pratt,
The Onslaught from Rigel — All chapters
(1932)
“ As Sherman climbed through the door of the fighting machine he glanced over his shoulder to see, far down the valley a black speck against the sky. An airplane? he wondered and it suddenly occurred to him that however great his thirst for information, he should have kept his knowledge of guns from the Lassans; for if there were other people alive out there in the world the day might come when it would be a battle—and explosives were as new to the Lassans as the light-ray to the children of men. ”
