After the 2003 invasion of Iraq was completed and the regime of Saddam Hussein was toppled in May 2003, an Iraqi insurgency began that would last until the United States left in 2011. The 2003–2006 phase of the Iraqi insurgency lasted until early 2006, when it escalated from an insurgency to a Sunni-Shia civil war, which became the most violent phase of the Iraq War.
The Triangle of Death is a name given to a region south of Baghdad during the 2003–2011 occupation of Iraq by the U.S. and allied forces which saw major combat activity and sectarian violence from early 2003 into the fall of 2007.
The 1920 Revolution Brigades was a Sunni militant group in Iraq, which included former members of the disbanded Iraqi army. It was established by the members of the former Ba'ath army of Saddam Hussein in 2003 following the American invasion. The group had used improvised explosive devices, and armed attacks against U.S.-led Coalition forces and comprises the military wing of the Islamic Resistance Movement. The group was named in reference to the Iraqi revolt of 1920.
The 2006 al-Askari Shrine bombing occurred on 22 February 2006 at approximately 6:44 a.m. local Iraqi time, and targeted the al-Askari Shrine in the city of Samarra, Iraq. The attack on the mosque, one of the holiest sites in Shia Islam, has not been claimed by any group; the then President of the United States, George W. Bush, claimed that the bombing was an al-Qaeda plot. Although the mosque was severely damaged from the blast, there were no casualties.
The following lists events that happened during 2006 in Iraq.
Operation Together Forward, also known as Forward Together, was an unsuccessful offensive against sectarian militias in Baghdad to significantly reduce the violence in which had seen a sharp uprise since the mid-February 2006 bombing of the Askariya Mosque, a major Shiite Muslim shrine, in Samarra.
The Battle of Ramadi was fought during the Iraq War from March 2006 to November 2006, for control of the capital of the Al Anbar Governorate in western Iraq. A joint US military force under the command 1st Brigade Combat Team, 1st Armored Division and Iraqi Security Forces fought insurgents for control of key locations in Ramadi. Coalition strategy relied on establishing a number of patrol bases called Combat Operation Posts throughout the city.
The Battle of Mosul was fought during the Iraq War in 2004 for the capital of the Ninawa Governorate in northern Iraq that occurred concurrently to fighting in Fallujah.
The 2004 Iraq spring fighting was a series of operational offensives and various major engagements during the Iraq War. It was a turning point in the war; the Spring Fighting marked the entrance into the conflict of militias and religiously based militant Iraqi groups, such as the Shi'a Mahdi Army.
Operation Imposing Law, also known as Operation Law and Order, Operation Fardh al-Qanoon or Baghdad Security Plan (BSP), was a joint Coalition-Iraqi security plan conducted throughout Baghdad. Under the Surge plan developed in late 2006, Baghdad was to be divided into nine zones, with Iraqi and American soldiers working side by side to clear each sector of Shiite militias and Sunni insurgents and establish Joint Security Stations so that reconstruction programs could begin in safety. The U.S. military commander in Iraq, David Petraeus, went so far as to say Iraq would be "doomed" if this plan failed. Numerous members of Congress stated the plan was a critical period for the U.S. presence in Iraq.
The Battle of Najaf took place on 28 January 2007 at Zarqa near Najaf, Iraq, between Iraqi Security Forces and fighters, initially thought to be Sunni insurgents but later reported to be members of the Shia Islam cult Soldiers of Heaven, who had joined a gathering of worshippers – or, by other accounts, a conflict, originally between an Iraqi government forces checkpoint and 200 armed pilgrims, which then expanded to include local residents, the Soldiers of Heaven group, and UK and U.S. forces. Reportedly, over 250 cult members and 11-25 members of the Iraqi security forces, and two U.S. soldiers were killed.
The Diyala province campaign was a series of operations conducted by coalition forces against Iraqi insurgents and a number of bombing and guerrilla attacks against the security forces in Diyala Governorate of Iraq, with the purpose of control of the province.
The Battle of Baqubah II took place during the Iraq War in the capital of the Iraqi province Diyala, to the north-east of Baghdad. It began in early March 2007, when U.S. and Iraqi forces commenced preliminary operations to "establish a presence in Diyala beyond their Forward Operating Base".
Operation Phantom Thunder began on 16 June 2007, when Multi-National Force-Iraq launched major offensive operations against al-Qaeda and other extremist terrorists operating throughout Iraq. It was the largest coordinated military operation since the 2003 invasion of Iraq. Operation Phantom Thunder was a corps level operation, including Operation Arrowhead Ripper in Diyala Province, Operation Marne Torch and Operation Commando Eagle in Babil Province, Operation Fardh al-Qanoon in Baghdad, Operation Alljah in Anbar Province, and continuing special forces actions against the Mahdi Army in southern Iraq and against Al-Qaeda leadership throughout the country. The operation was one of the biggest military operations in Iraq since the U.S. invasion in 2003.
Operation Phantom Phoenix was a major nationwide offensive launched by the Multinational Force Iraq (MNF-I) on 8 January 2008 in an attempt to build on the success of the two previous corps-level operations, Operation Phantom Thunder and Operation Phantom Strike and further reduce violence and secure Iraq's population, particularly in the capital Baghdad. The offensive consisted of a number of joint Coalition and Iraqi Army operations throughout northern Iraq as well as in the southern Baghdad Belts.
The Battle of Basra began on 25 March 2008, when the Iraqi Army launched an operation to drive the Mahdi Army militia out of the southern Iraqi city of Basra. The operation was the first major operation to be planned and carried out by the Iraqi Army since the invasion of 2003.
The 2008 Iraq spring fighting was a series of clashes between the Mahdi Army and allies and the Iraqi Army supported by coalition forces, in southern Iraq and parts of Baghdad, that began with an Iraqi offensive in Basra.
The siege of Sadr City was a blockade of the Shi'a district of northeastern Baghdad carried out by US and Iraqi government forces in an attempt to destroy the main power base of the insurgent Mahdi Army in Baghdad. The siege began on 4 April 2004 – later dubbed "Black Sunday" – with an uprising against the Coalition Provisional Authority following the government banning of a newspaper published by Muqtada Al-Sadr's Sadrist Movement. The most intense periods of fighting in Sadr City occurred during the first uprising in April 2004, the second in August the same year, during the sectarian conflict that gripped Baghdad in late 2006, during the Iraq War troop surge of 2007, and during the spring fighting of 2008.
Kata'ib Hezbollah or the Hezbollah Brigades, is a radical Iraqi Shiite paramilitary group which is a part of the Iraqi Popular Mobilization Forces (PMF), staffing the 45th, 46th, and 47th Brigades. During the Iraq War (2003–11), the group fought against Coalition forces. It has been active in the War in Iraq (2013–2017) and the Syrian civil war (2011–present). The group was commanded by Abu Mahdi al-Muhandis until he was killed in a US drone attack in 2020. Thereafter, he was replaced by Abdul Aziz al-Muhammadawi, as the new leader of the PMF. KH seeks to establish an Iran-aligned government in Iraq, expel American forces from the country, and advance the regional and international interests of Iran in Iraq and the region. The group is responsible for killing hundreds of U.S. soldiers and takes a central part in carrying out attacks against U.S. targets in Iraq and acts as part of the Axis of Resistance. Kata'ib Hezbollah has received extensive training, funding, logistic support, weapons, and intelligence from the Quds Force of Iran's Islamic Revolutionary Guard Corps (IRGC).
United States 
Iraq 
Islamic State of Iraq 
