<Li> John Cena as Staff Sergeant Shane Matthews </Li> <Li> Laith Nakli as Juba (voice) </Li> <P> On November 12, 2014, it was announced that Amazon Studios had bought its first ever original spec script by Dwain Worrell, about an American sharpshooter trapped behind a wall by an Iraqi sniper . Worrell wrote his screenplay while teaching English in China . Worrell drew from his background as a playwright to flesh out the second act of the screenplay, which focuses on Isaac's conversation with the sniper . Worrell said, "What interested me about it was the simple conversation between two people . That could almost be had on a New York City park bench with two guys playing chess . There is that sort of dynamic between the characters in the film ." The script appeared in the 2014 Black List of most liked un-produced screenplays . </P> <P> On March 29, 2016, it was reported that Doug Liman had been hired to direct the psychological thriller . Glen Basner's FilmNation Entertainment handled the film's international sales at the 2016 Cannes Film Festival, allowing for a theatrical release . </P>

Is the wall movie based on true story