The Martians arrival on Earth is aboard large , cylindrical spacecraft launched from some kind of immense cannon on Mars .
Martians ' chief weapon of war is the invisible ' Heat - Ray ' that produces a white flame that consumes any organism it touches .
The Martians arrival on Earth is aboard large , cylindrical spacecraft launched from some kind of immense cannon on Mars , and their chief weapon of war is the invisible ' Heat - Ray ' that produces a white flame that consumes any organism it touches .