Iraqi Prime Minister Haider al-Abadi announced the start of military operations to liberate the northern city of Mosul from Islamic State militants on Monday, launching the country on its toughest battle since American troops left nearly five years ago. State TV aired a brief statement in the early hours Monday announcing the start of the widely anticipated military offensive to drive IS out of Iraq's second-largest city, according to AP. Broadcasts showed the prime minister, dressed in the uniform of the elite counterterrorism forces, speaking while flanked by senior military officers. "These forces that are liberating you today, they have one goal in Mosul which is to get rid of Daesh and to secure your dignity. They are there for your sake," he told the city's residents, using an alternate name for the militant group. "God willing, we shall win." The thuds of sporadic artillery shelling rumbled across the rolling Nineveh plains in the direction of Mosul, witnesses said. State TV broadcast patriotic music within minutes of the announcement.