War started on 20 March 2003.
US cruise missiles and bombs were dropped on Iraq's capital city, Baghdad.
They were targeting Saddam Hussein, his sons, key members of his leadership and government buildings.
Key battles followed in the Iraqi towns of Umm Qasr, Basra, Nasiriya and Karbala. US military officials admitted the Iraqi resistance was stronger than they had expected, but they slowly moved towards Baghdad.
Once the US forces had captured Baghdad Airport, they met less fighting and started taking control of the capital.