A science-fiction comic based on the novel Maza of the Moon by Otis Adelbert Kline.
An American inventor becomes the first human to land an object on the moon, by firing a giant space-gun at it. To his surprise, the people of the moon fire back. When he visits the satellite, he becomes caught up in the conflict between two warring peoples, one of which is ruled by a beautiful moon-princess.
The story was written by Walter Gibson, best known as the author of The Shadows pulp adventures (under the name Maxwell Grant).
This entire issue can be downloaded here