Drawn from a collection of one hundred interviews with First World War veterans, most never recorded before or since, this episode focuses on the medical staff who worked behind the trenches. Nurses, doctors, and orderlies describe treating the gassed, the shell-shocked, and the amputees, often working through mud, blood, and shortages of anesthetic with a steady stream of casualties arriving from the front. Archival footage of field hospitals and casualty clearing stations is set alongside the testimony of the men they treated, who recall the specific people who kept them alive. The interviews span 1914 to 1918 and cover the full arc of the war, from the first battles of movement to the static horror of the Somme and Passchendaele. All the interview subjects have since died, which gives their firsthand accounts of triage under fire and the psychological toll on caregivers a weight that reenactment could never match. The series builds its case entirely from their voices rather than expert narration.