Showtime released the first-look clip for the upcoming feature-length documentary The Longest War, which hails from Emmy(R)-winning director Greg Barker (Manhunt: The Inside Story of the Hunt for Bin Laden) and Alex Gansa and Howard Gordon, the executive producers of the Emmy(R) and Peabody-winning series Homeland. The Longest War premieres on Showtime on Sunday, April 19 at 10 p.m. ET/PT, immediately following the penultimate episode of Homeland .