Iraq just began what could be 'the most complex and largest' anti-ISIS operation ever

Mosul
Mosul

(Fighters from predominantly Sunni Arab forces at a training session in Bashiqa, Iraq, on October 6 before the battle to recapture Mosul.Reuters)

Iraqi Prime Minister Haider al-Abadi announced late Sunday night the start of the operation to liberate Iraq's second-largest city, Mosul, from the Islamic State more than two years after it fell to the terrorist group.

"The hour has come and the moment of great victory is near," al-Abadi said in a speech on state TV, surrounded by the Iraqi armed forces' top commanders. "I announce today the start of the operation to liberate the province of Nineveh."

The operation is the largest deployment of Iraqi soldiers since the US invasion in 2003, and it is being bolstered by airpower from a 60-country coalition opposed to the Islamic State, also known as ISIS, ISIL, or Daesh.

The liberation of Mosul has been the linchpin of the Obama administration's plan to defeat ISIS in Iraq, though Washington has expressed concern over Baghdad's plans to move forward with the Mosul operation this year.

More than 80,000 troops are involved, Maj. Salam Jassim, a commander with Iraq's elite special forces, told The Washington Post. The Iraqi army dropped thousands of leaflets on the city over the weekend warning its residents to stay away from known ISIS enclaves and to tell their children that the sound of airstrikes and bombs were "a game or thunder before the rain."

Still reeling from the humiliating loss of Mosul in summer 2014 — when US-trained Iraqi forces dropped their American weapons and fled as ISIS advanced on the city — the Iraqi government spent the better part of the past year preparing for the offensive. Sunday's start is most likely only the beginning of a very long battle to retake the large city.

"The United Nations is deeply concerned that in a worst-case scenario, the operation in Mosul could be the most complex and largest in the world in 2016, and we fear as many as one million civilians may be forced to flee their homes," Lise Grande, the United Nations' humanitarian coordinator for Iraq, told The New York Times last week.

Mosul
Mosul

(Peshmerga forces gathered on the outskirts of Mosul on Saturday during preparations to attack the city.Reuters)

Conflicting reports have emerged over how fiercely ISIS is preparing to fight the coming offensive. CNN reported on Sunday that members of ISIS were fleeing the city as Iraqi soldiers approached, but many experts have speculated that ISIS is unlikely to go quietly. Mosul is the terrorist group's last stronghold in Iraq, where its territory has shrunk from 40% of the country at its peak to roughly 10% now.