The 2003 invasion of Iraq lasted from 20 March to 1 May 2003 and signalled the start of the Iraq War, which was dubbed Operation Iraqi Freedom by the United States (prior to 19 March, the mission in Iraq was called Operation Enduring Freedom, a carry over from the War in Afghanistan). The invasion consisted of 21 days of major combat operations, in which a combined force of troops from the United States, the United Kingdom, Australia and Poland invaded Iraq and deposed the Ba’athist government of Saddam Hussein. The invasion phase consisted primarily of a conventionally fought war which concluded with the capture of the Iraqi capital of Baghdad by American forces.
160,000 troops were sent by the Coalition into Iraq, during the initial invasion phase, which lasted from 19 March to 9 April 2003. About 130,000 were sent from the USA alone, with about 28,000 British Soldiers, Australia (2,000), and Poland (194). 36 other countries were involved in its aftermath. In preparation for the invasion, 100,000 U.S. troops were assembled in Kuwait by 18 February. The coalition forces also received support from Kurdish irregulars in Iraqi Kurdistan.