Iraq's U.S.-backed forces wrested Mosul from the Islamic State group at the cost of enormous destruction. The nearly 9-month fight culminated with a crescendo of devastation — the blasting of the historic Old City to root out the deeply dug-in militants. 

Nearly a third of the Old City — more than 5,000 buildings — was damaged or destroyed in the final three weeks of bombardment up to July 8, according to a survey by U.N. Habitat using satellite imagery. Across the city, 10,000 buildings were damaged over the course of the war, the large majority in western Mosul, the scene of the most intense artillery, airstrikes and fighting during the past five months. The survey only covers damage visible in satellite photos, meaning the real number is likely higher.

The population, once numbering 3 million, is battered and exhausted, with hundreds of thousands displaced. Without a swift campaign to rebuild Mosul, aid and rights groups warn the current humanitarian crisis will balloon and resentment will likely give way to extremism, undermining the victory.