The Battle of Mosul: The Toughest Urban Combat Operation Since World War II
Initiated in October 2016, the Battle of Mosul was the largest conventional land battle globally since 2003. As Iraqi and allied forces converged on the Islamic State’s final Iraqi stronghold, they faced elaborate tunnel networks, human shields, and fierce resistance in a fight that reshaped the city’s landscape.
The operation, officially titled 'We Are Coming, Nineveh,' began on 16 October 2016. It involved a massive coalition of approximately 108,500 personnel, including Iraqi security forces, Peshmerga fighters, and various paramilitary groups. This force significantly outnumbered the estimated 3,000 to 5,000 Islamic State militants defending the city, though some estimates of the militant presence ranged as high as 12,000. The coalition was supported by an international alliance of 60 nations, which provided critical air support, intelligence, and logistical expertise.
Combat within Mosul was exceptionally brutal. ISIL utilized the city’s dense urban environment to their advantage, constructing hundreds of tunnels, laying extensive minefields, and using civilians as human shields. The fighting was so intense that it drew comparisons to historic sieges like Stalingrad and Verdun. By the time Iraqi Prime Minister Haider al-Abadi declared victory on 10 July 2017, the city had suffered immense destruction. The cost of clearing explosives and rebuilding Mosul was estimated at $50 billion, with the Old City alone requiring $1 billion for repairs.
The battle was not merely a military engagement but a humanitarian crisis. Mosul, Iraq's second most populous city, saw its population drop from 2.5 million to 1.5 million during the years of ISIL rule. The conflict forced the coalition to balance rapid military advancement with the protection of civilians, a challenge that frequently slowed progress. Ultimately, the liberation of Mosul marked the end of the Islamic State’s self-proclaimed caliphate in Iraq, which had been declared by Abu Bakr al-Baghdadi at the city's Great Mosque in 2014.
Source: Battle of Mosul (2016–2017)
