[30][31] According to Blair, the trigger was Iraq's failure to take a "final opportunity" to disarm itself of alleged nuclear, chemical, and biological weapons that U.S. and British officials called an immediate and intolerable threat to world peace.

While special forces 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.

Enacted following the expulsion of UN weapons inspectors the preceding August (after some had been accused of spying for the U.S.), the act provided $97 million for Iraqi "democratic opposition organizations" to "establish a program to support a transition to democracy in Iraq.

On the morning of 11 September 2001, the Islamist militant organization al-Qaeda executed four coordinated attacks against the United States utilizing hijacked jet airliners to crash into major symbols of American economic and military power.

[76] Almost a year later, Madrid suffered the worst terrorist attack in Europe since the Lockerbie bombing, motivated by Spain's decision to participate in the Iraq war, prompting some Spaniards to accuse the Prime Minister of being responsible.

[80] Egyptian president Hosni Mubarak's national security advisor, Osama El-Baz, sent a message to the U.S. State Department that the Iraqis wanted to discuss the accusations that the country had weapons of mass destruction and ties with Al-Qaeda.

He was offered top priority to U.S. firms in oil and mining rights, UN-supervised elections, U.S. inspections (with up to 5,000 inspectors), to have al-Qaeda agent Abdul Rahman Yasin (in Iraqi custody since 1994) handed over as a sign of good faith, and to give "full support for any U.S. plan" in the Israeli–Palestinian peace process.

[104] The BBC has also noted that, while President Bush "never directly accused the former Iraqi leader of having a hand in the attacks on New York and Washington", he "repeatedly associated the two in keynote addresses delivered since 11 September", adding that "Senior members of his administration have similarly conflated the two."

"[105] Also in September 2003, The Boston Globe reported that "Vice President Dick Cheney, anxious to defend the White House foreign policy amid ongoing violence in Iraq, stunned intelligence analysts and even members of his own administration this week by failing to dismiss a widely discredited claim: that Saddam Hussein might have played a role in the 11 Sept.

"[106] A year later, presidential candidate John Kerry alleged that Cheney was continuing "to intentionally mislead the American public by drawing a link between Saddam Hussein and 9/11 in an attempt to make the invasion of Iraq part of the global war on terror.

These "spikes of activity" were, in the words of then British Defence Secretary, Geoff Hoon, designed to 'put pressure on the Iraqi regime' or, as The Times reported, to "provoke Saddam Hussein into giving the allies an excuse for war".

[159] On the night of 17 March 2003, the majority of B and D squadron British 22nd SAS Regiment, designated as Task Force 14, crossed the border from Jordan to conduct a ground assault on a suspected chemical munitions site at a water-treatment plant in the city of al-Qa'im.

Many observers felt that the coalition devoted sufficient numbers of troops to the invasion, but too many were withdrawn after it ended, and that the failure to occupy cities put them at a major disadvantage in achieving security and order throughout the country when local support failed to meet expectations.

Initially, the 1st Marine Division (United States) fought through the Rumaila oil fields, and moved north to Nasiriyah—a moderate-sized, Shi'ite-dominated city with important strategic significance as a major road junction and its proximity to nearby Tallil Airfield.

A pair of US Navy F/A-18s responded to an urgent CAS request from the force and dropped two 500lb JDAMs on the Ansar al-Islam machine gun nests and strafed the positions with 20 mm cannon before departing due to being low on fuel.

Two MH-60K Blackhawks carrying a para jumper medical team and two MH-60L DAPs of the 160th SOAR responded and engaged the Iraqis, which allowed the Delta operators to move their casualties to an emergency HLZ and they were medevaced to H-1 escorted by a pair of A-10As, however Master Sergeant George Fernandez died.

As ODA 51 cautiously advanced on the village, it came under intense fire – the two platoons of Iraqis turned out to be closer to battalion strength and equipped with heavy weapons like 82 mm mortars, anti-aircraft guns, and an artillery piece.

The SSE took longer than expected owing to the size and maze-like structure of the building, the mission completed after 45 minutes, later tests of the material recovered by DEVGRU showed no evidence of chemical or biological weapons at the Objective Beaver.

Bravo company 5th SFG and the coalition SOF secured the airfield, finding a Roland surface-to-air missile system, around 80 assorted anti aircraft cannon guns including ZSU-23-4 Shilka, SA-7 grail handheld SAMs and an enormous amount of ammunition.

H-3 was established as an Advanced Operating Base for Bravo company, with supplies delivered by C-130s and MH-47Es; ODA 581 vehicle checkpoint managed to capture the Iraqi general in command of H-3 as he was trying to escape in civilian attire, he was secured and flown by an unmarked CIA SAD Air Branch Little Bird on 28 March for further interrogation.

ODA 521 and 525 continued to operate in the region, stopping several trucks carrying foreign fighters, they disarmed them, took their details and warned them not to come back before sending them to Syria; in late May, the teams were replaced by the 3rd Armoured Cavalry Regiment.

[226] At 0100 on 1 April 2003, TF Tarawa commenced their deception mission, CIA elements cut the city's power as the helicopters approached their objective, the AH-6s led the way, behind them the MH-6s dropped off Task Force 20 sniper teams at strategic locations around and on the hospital.

Shortly after the sudden collapse of the defense of Baghdad, rumors were circulating in Iraq and elsewhere that there had been a deal struck (a "safqua") wherein the U.S.-led coalition had bribed key members of the Iraqi military elite and/or the Ba'ath party itself to stand down.

Other members of the coalition were Afghanistan, Albania, Angola, Azerbaijan, Bulgaria, Colombia, Costa Rica, the Czech Republic, Denmark, Dominican Republic, El Salvador, Eritrea, Estonia, Ethiopia, Georgia, Honduras, Hungary, Iceland, Italy, Japan, Kuwait, Latvia, Lithuania, Macedonia, Marshall Islands, Micronesia, Mongolia, the Netherlands, Nicaragua, Palau, Panama, the Philippines, Portugal, Romania, Rwanda, Singapore, Slovakia, Solomon Islands, South Korea, Tonga, Turkey, Uganda, Ukraine, and Uzbekistan.

General Eric Shinseki, U.S. Army Chief of Staff, recommended "several hundred thousand"[252] troops be used to maintain post-war order, but then Secretary of Defense Donald Rumsfeld—and especially his deputy, civilian Paul Wolfowitz—strongly disagreed.

[122] The central U.S. justification for launching the war was that Saddam Hussein's alleged development of nuclear and biological weapons and purported ties to al-Qaeda made his regime a "grave and growing"[307] threat to the United States and the world community.

As Marine Lieutenant General Greg Newbold, the Pentagon's former top operations officer, wrote in a 2006 Time article, "I now regret that I did not more openly challenge those who were determined to invade a country whose actions were peripheral to the real threat—al-Qaeda.

"[330] Critics within this vein have further argued that containment would have been an effective strategy for the Saddam government, and that the top U.S. priorities in the Middle East should be encouraging a solution to the Israeli–Palestinian conflict, working for the moderation of Iran, and solidifying gains made in Afghanistan and Central Asia.

In a 15 August 2002 The Wall Street Journal editorial entitled "Don't attack Saddam", Scowcroft wrote that, "Possibly the most dire consequences would be the effect in the region ... there would be an explosion of outrage against us ... the results could well destabilize Arab regimes", and, "could even swell the ranks of the terrorists.

"[333] In an October 2015 CNN interview with Fareed Zakaria, former British Prime Minister Tony Blair apologized for his 'mistakes' over Iraq War and admitted there were 'elements of truth' to the view that the invasion helped promote the rise of ISIS.