Menace of the Saucers, by Eando Binder (epub/Kindle/pdf)
Smith was a writer of science fiction stories. Now, incredibly, he was witnessing the real thing.
Travelling silently at immense speed, its mirrored metal sides flashing in the sun, the saucer swooped in for a landing on Earht. Then, as Smith watched, another saucer appeared in the sky -- and the dogfight began! The saucers -- aliens from beyond known space -- were battling for control of the Earth. Something had to be done, even if Smith had no idea what it should be.
The trouble was -- no one believed him!