Parts of this book were published as separate short stories in The Magazine of Fantasy and Science Fiction:
“Time Patrol” May 1955;
“Delenda est” Dec 1955;
“Brave To Be A King” Aug 1959;
“The Only Game in Town” Jan 1960;
“Gibraltar Falls” Oct 1975.
Guardians of Time collection was first published in Oct 1962; “Gibraltar Falls” was added to it in Oct 1981 edition.
Manse Everard is a man with a mission. As an Unattached Agent of the Time Patrol, he's to go anyplace—and anytime!—where humanity's transcendent future is threatened by the alteration of the past. This is Manse's profession, and his burden: for how much suffering, throughout human history, can he bear to preserve?