1st Avon printing July 1968 (originally appeared as part of an Ace Double in 1958.) Cover by Don Crowley, 142 pages. Condition is near-Fine: tight and square with flat spine; very light wear; age tanning is mild and uniform. No stamps, marks or writing - a very clean copy that may be unread.

Expanded from a magazine version in Science Fiction Quarterly February 1958: as "We, the Marauders." This expanded version first appeared as half of an Ace Double in 1958. (The shorter version has appeared as half of a Belmont Double.)