The Battle for Mosul (S01E04)

The long-awaited assault on Mosul kicks off at the city's eastern edge. ISIS escalates their strategies, leading to rising casualties among the medics and taking a heavy emotional toll on Pete. Meanwhile, in the U.S., PJ and Levi's family grapple with the reality of his death, even as his body stays in Syria. Although ISIS is pushed back in the Middle East, the advances come at a significant cost for the volunteers involved.