At long last the war has ended and no one needs the cannons Impey Barbicane manufactures, anymore. While he, Impey, is thinking what to do, he turns to the moon and the moon gives him a good idea: He will build the biggest cannon in the world, a cannon that will offer new possibilities to all humanity. It won’t be a weapon-cannon, no, it will be a cannon that can land a cannonball on the surface of the moon. Yes! It will be a cannon for peace.