The war machines are crab-like "walkers" with six legs. A Heat Ray is built into the machine's "head", and is fired from a single eye. The fighting machines do not appear to have protection against modern artillery (avoiding the "invisible shields" seen in the 1953 film version and Steven Spielberg's 2005 film), leaving their ability to conquer unexplained. The aliens do have a substance similar to the black smoke, but is more of a dense green toxic gas unable to rise above ground level, allowing survivors to escape by getting to high places.