It was subsequently published as part of a short story collection in A Treasury of Science Fiction[1] (Groff Conklin,[2] 1948 and Expedition to Earth in 1953.
It details the concern of the advanced Martian civilization with humanity's research into rocketry following the discovery of atomic power.
The title of the story refers to the solution humanity utilizes to overcome the threat of the Martians.
Ten years pass without any further rocket experimentation, while the Martians plan for the extermination of the human race, believing that Earth will always be a threat to them.
Rather than experimenting with rockets, humans had perfected matter transmission and beamed their bombs directly over the Martian cities.