An expert in the area of urban warfare mentioned that up to 1,000 US soldiers could die if things go bad. Of course, since it's urban warfare, it's not very unlikely that the Iraqi troops will actually take cover behind civilians. It won't be as easy to spot an obvious enemy either, and contemplating for only a second would most likely get you killed.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram