13 intense images of the rise and fall of ISIS, the feared terror group that has re-surged from previous defeats
The origins of the ISIS caliphate stretch back to the US invasion of Iraq, when the destruction of Saddam Hussein's government fostered the rise of militant groups throughout the country
Al-Zarqawi orchestrated strings of attacks against coalition forces in Iraq. Up to $10 million was offered as a reward for his death.
Al-Zarqawi was killed by a US airstrike in 2006, and the group was rebranded by his successors as the Islamic State in Iraq.
Abu Omar al-Baghdadi led the newly formed Islamic State in Syria, also known as the Islamic State in the Levant.
In 2007, US forces overtook the neighborhood of Baqouba, the then-capital of the IS caliphate, in a weeklong operation.
300 to 500 members of the insurgent group were believed to be operating in Baqouba when US forces overtook the IS in Iraq capital.
IS rebranded again in 2010 under the new leadership of self-proclaimed caliph Abu Bakr al-Baghdadi, and expanded to become the Islamic State in the Levant.
Also known as the Islamic State in Syria, the IS caliphate in Iraq had suffered major losses before its rebirth.
IS numbers swelled as the militants freed thousands of prisoners throughout Iraq, starting in 2012.
US troops withdrew from Iraq at the end of 2011. This departure and Iraq's weak and ill-trusted security forces allowed a security vacuum to form that fostered the rise of ISIS.
In 2013, the militants freed at least 500 prisoners from Abu Ghraib, and in 2014 released some 1,500 from prisons in Mosul and Tikrit.
By this time, ISIS had expanded its territory, merging with Al Nusra Front, an al-Qaeda linked terrorist organization in Syria.
By early 2014, the group made considerable gains: ISIS held Fallujah in Iraq and Raqqa in Syria.
The Islamic State had sprouted tentacles in Iraq and Syria, but was still struggling to gain control, especially in Syria, where it also wrestled with al-Qaeda affiliate Al Nusra Front.
In summer 2014, ISIS controlled Mosul, declared itself a caliphate and proclaimed al-Baghdadi as its caliph.
The Caliphate of the Islamic State was at its territorial peak in late 2014 through 2015.
In August 2014, ISIS releases a shocking video showing the beheading of American journalist James Foley. It would be the first of many to surface that year.
In September, ISIS released videos showing the beheadings of American-Israeli journalist Steven Sotloff and British aid worker David Haines.
In October, a video is released showing the beheading of British hostage Alan Henning.
In November, Iraqi officials say ISIS militants executed 322 members of a Sunni tribe. ISIS also released a video showing the beheadings of a dozen Syrian soldiers and American hostage Peter Kassig.
At its territorial height, the Islamic State controlled nearly every major city near the Iraq-Syria border, and had accepted allegiance from satellite groups in Southeast Asia and throughout Africa.
In 2015, ISIS continued to use graphic brutality to recruit and to threaten foes, releasing several videos depicting executions.
One video showed a Jordanian pilot as they burned him alive in a cage. Another showed a man, accused of being gay, thrown off of a building.
Throughout 2015, Iraqi troops started retaking major cities: Ramadi, Fallujah, and Tikrit paved the way for the Battle for Mosul
By October 2017, US troops and Kurdish allies regained control of Raqqa, Syria
On Wednesday, US President Donald Trump announced the withdrawal of American forces from Syria, proclaiming ISIS had been defeated
Trump withdrew the claim the next day, saying that all remaining ISIS threats would be handled by Syrian President Bashar al-Assad.
His position breaks from those of his own Defense and State departments, as well as the US-led coalition in Iraq and Syria. The withdrawal order also reportedly provoked Defense Secretary Jim Mattis to tender his resignation.
The militant group may have lost its territorial caliphate, but it retains a presence in the Middle East and a loyal following around the globe. Many experts agree that its days as a terror organization are far from over.
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