Dramatic and deeply personal film about the psychological impact of killing on the lives of five soldiers. Representing a cross section of nationalities, gender, class and race, these soldiers reveal intimate memories about the central act of war, the killing of another human being. How do these individuals make sense of what they have done? What happens when time challenges their carefully constructed stories? Consciously apolitical but deeply psychological, Hidden Battles examines the strength and struggles of men and women who kill and how they create a life for themselves afterward.

During the Second World War, the Allies threaten to attack Spain, an allegedly neutral country, if the Francoist regime keeps allowing Nazi Germany to extract Galician tungsten, a strategic mineral, paramount to the war effort.