Watch Mosul for Free: How to Stream the Movie Online at 123Movies. . Described by some military commanders as the deadliest urban combat since World War II, the battle to drive ISIS out of Mosul as the terror group held civilians captive there was brutal and grueling. Shot over the course of the entire nine-month fight, this vivid documentary follows the experiences of four young soldiers in a team of Iraqi Special Forces tasked with leading the battle.