WMD's Against Ground Troops...no?

huh?????.....read a piece suggesting that if the military believed that saddam had wmd's and chemical stuff it would have been strange for them to use ground troops and also only 25% had the chemical suit things----so how does one invade a country and on into baghdad in a very aggressive way and feel 100% confident that these weapons will not be used against you? saddam was a "madman" and was being invaded so you would expect him to just coool it? was info learned in gulf I that allowed some real "gaming"?---------------------------lopez