The 2003 invasion of Iraq, (from March 20 to May 1, 2003) was led by the United States, alongside the United Kingdom and smaller contingents from Australia, Denmark, Poland and Spain. Four countries participated with troops during the initial invasion phase, which lasted from March 20 to May 1. These were the United States (248,000), United Kingdom (45,000), Australia (2,000), and Poland (194). 36 other countries were involved in its aftermath. The invasion marked the beginning of the current Iraq War. In preparation for the invasion, 100,000 US troops were assembled in Kuwait by February 18. The United States supplied the vast majority of the invading forces, but also received support from Kurdish irregulars in Iraqi Kurdistan. According to then President of the United States, George W. Bush and then Prime Minister of the United Kingdom, Tony Blair, the reasons for the invasion were "to disarm Iraq of weapons of mass destruction (WMD), to end Saddam Hussein's support for terrorism, and to free the Iraqi people." Although some remnants of pre-1991 production were found after the end of the war, US government spokespeople confirmed that these were not the weapons for which the US went to war. In 2005, the Central Intelligence Agency released a report saying that no weapons of mass destruction had been found in Iraq. In a January 2003 CBS poll 64% of US nationals had approved of military action against Iraq, however 63% wanted President Bush to find a diplomatic solution rather than go to war, and 62% believed the threat of terrorism directed against the US would increase due to war. The invasion of Iraq was strongly opposed by some traditional US allies, including the governments of France, Germany, New Zealand, and Canada. Their leaders argued that there was no evidence of weapons of mass destruction in Iraq and that invading the country was not justified in the context of UNMOVIC's February 12, 2003 report. On February 15, 2003, a month before the invasion, there were worldwide protests against the Iraq war, including a rally of three million people in Rome, which is listed in the Guinness Book of Records as the largest ever anti-war rally. According to the French academic Dominique Reynié, between January 3 and April 12, 2003, 36 million people across the globe took part in almost 3,000 protests against the Iraq war. The invasion was preceded by an air strike on the Iraqi Presidential Palace on 19 March 2003. The following day coalition forces launched an incursion into Basra Province from their massing point near the Iraqi-Kuwaiti border. While commandos launched an amphibious assault from the Persian Gulf to secure Basra and the surrounding petroleum fields, the main invasion army moved into southern Iraq, occupying the region and engaging in the Battle of Nasiriyah on 23 March. Massive air strikes across the country and against Iraqi command and control threw the defending army into chaos and prevented an effective resistance. On 26 March the 173rd Airborne Brigade was airdropped near the northern city of Kirkuk where they joined forces with Kurdish rebels and fought several actions against the Iraqi army to secure the northern part of the country. The main body of coalition forces continued their drive into the heart of Iraq and met with little resistance. Most of the Iraqi military was quickly defeated and Baghdad was occupied on 9 April. Other operations occurred against pockets of the Iraqi army including the capture and occupation of Kirkuk on April 10, and the attack and capture of Tikrit on 15 April. Iraqi President Saddam Hussein and the central leadership went into hiding as the coalition forces completed the occupation of the country. On 1 May an end of major combat operations was declared, ending the invasion period and beginning the military occupation period.

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