Prime Minister Haider al-Abadi arrived in Mosul on July 9, 2017. The air smelled of cordite and decay. He walked through the shattered alleyways of the Old City, past the carcasses of buildings and the husks of car bombs. The next day, he made it official. In a statement broadcast nationwide, he declared Mosul fully liberated from the Islamic State. The battle had lasted nearly nine months, pitting a coalition of Iraqi security forces, Kurdish Peshmerga, and popular mobilization units against an entrenched and fanatical enemy.
The declaration was a political and symbolic necessity, but the fighting was not completely over. Isolated pockets of ISIS resistance continued for days in the labyrinthine ruins. The cost was catastrophic. The United Nations estimated that as many as 11,000 civilians were killed. Over 900,000 people were displaced. Large sections of the city, especially the western half, were reduced to rubble. The victory was less a celebration and more an acknowledgment of a grim task completed.
The narrative of a unified Iraqi force was partially true and strategically essential. The ground assault was led by the elite Counter-Terrorism Service, with critical support from Shiite militias and U.S.-led coalition airpower. This patchwork alliance would later show fractures, but in Mosul, it held under a common enemy. The liberation did not destroy ISIS as an ideology, but it shattered its territorial caliphate, depriving it of its largest urban center and administrative capital.
Mosul’s liberation marked the end of a specific phase of war and the beginning of an uncertain peace. The city’s physical destruction was so comprehensive that rebuilding was estimated to require decades and tens of billions of dollars. The social fabric, torn by ISIS’s brutal rule and the sectarian tensions that preceded it, was in tatters. The victory proved that ISIS could be defeated militarily. It did not answer the question of what would fill the void it left behind.