Tales to Astonish #29

An alien armada lands on Earth with weapons that seem to disintegrate anything. Humanity is helpless before the aliens, until they demand a man vacate his farm in order to make way for a spaceport. The farmer gets so angry he lays the alien out with the butt of his rifle. The aliens disintegrate things like trucks and houses, but they don't fire at people. Once the farmer realizes this and spreads the word, the aliens retreat from the human's firearms.