I need help finding this really good book that I read a long time ago where Martians try to invade Earth because back at Mars, they need more resources.
I had read this book quite long ago, so I remember only these details :-
They came in a sort of 'capsule' that could change the amount of gravity felt inside. I know this because of the fact that when they landed, the Martians cannot bear the Earth's gravitational pull because it is much more than their own planet's.
The Martians did not care about how many humans they killed nor how they did it.
They tried to disrupt architecture and machinery as well such as post offices (not sure) and telegraphs (quite sure).
Their killing machines (or something like that) emitted 'black smoke' as their weapon.
The book ended with the aliens dying because of the microorganisms that inhabit the planet. But I don't quite remember why.
This book was quite well known, and a movie was also made on the book.