combat on the Moon
The Pool of Life by P. Schuyler Miller
The Pool of Life – From out of the primordial ooze comes an entity that plots to conquer the Earth.
Brigands of the Moon by Ray Cummings
One of the early great space opera novels, Brigands of the Moon by Ray Cummings (1887-1957) was serialized in four parts in Astounding Stories of Super Science in its March through June 1930 issues. Gregg Haljan, Third Officer of the Planetara, must fight Martian pirates and Earth traitors to protect the precious radium ore found on the Moon from being hijacked.