By the beginning of April , U.S. - led forces occupied much of Iraq .
The Iraqi government and military collapsed within three weeks of the beginning of the U.S. - led 2003 invasion of Iraq on 20 March .
By the beginning of April , U.S. - led forces occupied much of Iraqi .
The Iraqi government and military collapsed within three weeks of the beginning of the U.S. - led 2003 invasion of Iraq on 20 March .