This report was first broadcast on 12 July 2007
It is the experience of the US troops which is turning American opinion against the conflict in Iraq.
Channel 4 News gained an unprecedented insight into the dangers they face each day.
Guardian photographer Sean Smith spent two months with US troops, following soldiers taking part in the surge and trying to contain the insurgency.
The US administration claim the extra troops have brought some stability to Baghdad, but the city remains divided between Sunni and Shia communities. As a cameraman and stills photographer, his is an impressionistic view of war.