Richard Basehart portrays “Denno,” a man who shows no fear in combat during the Korean War but lacks any ambition for promotion. The situation seems straightforward as his unit begins their latest assignment; however, they are tasked with protecting a narrow pass from an enemy force positioned in a cave high above a snowy hillside. This puts he and his roughly fifty comrades in a precarious position against a much larger attacking army. It’s possible Samuel Fuller was influenced by propaganda while creating the film, because there's never any real danger of total destruction. Instead, we are presented with well-developed characters brought to life by Basehart, Gene Evans as “Sgt. Rock,” and Craig Hill as Lieutenant “Gibbs.” As the leadership structure diminishes, a sense of foreboding grows for "Denno" and those around him who have long recognized his unwillingness to assume command. The film’s strength lies in its depiction of genuine worry, providing insight into the fear not just of the Chinese soldiers but of being responsible for the lives of others—a responsibility he felt unprepared for. While the production values aren't exceptional and lack a sense of realism, the artificial studio setting may have inadvertently contributed to a feeling of confinement as the shrinking group of soldiers sought to gain time for fifteen thousand other soldiers nearby. Evans consistently delivers in these tough soldier roles, and with a diverse cast filling out the rest of the unit, Basehart maintains control effectively. Despite its obvious visual shortcomings, the film ultimately proves quite successful.

Source on TMDB