Originally posted by Braxis
what kind of jerk would prepare a world-wide invasion without checking if they troops would get sick?
I wholeheartedly agree and in fact, I'm writing a complaint letter to the original author and......
...oh wait....
Honestly, can you imagine the uproar if the movie deviated from the book and the aliens were all killed by tom cruise with 5,000 grenades?
Also, we don't know the story from the alien's side. Maybe their planet has been mined to the point of extinction and they could only send so many ships. Maybe they used a really big stargate to warp the tripods there, but the trip would kill the pilots, who had to take the slow route at less than speed-of-light travel. Maybe their stargate can't warp stuff back, so they didn't know what the planet was like, except for long-range scans. Who knows?