In March 1968, soldiers of Charlie Company entered the village of My Lai in South Vietnam and, over roughly four hours, killed hundreds of unarmed civilians. This History Hit production reconstructs the massacre through interviews with veterans who were present that day, alongside archival footage and photographs from the aftermath. The film traces the chain of events from the unit's training and the command breakdown that preceded the killings to the cover-up that followed and Ronald Ridenhour's letter that eventually forced an investigation. Veterans speak plainly about what they did and saw, and about the psychological damage that stayed with them for decades afterward. The documentary also weighs the massacre's place in the wider war, as a moment that hardened American public opposition to the conflict once photographs and testimony reached the press. It does not soften the record: the raw accounts and the scale of the killing are presented directly, without reenactment gloss, as a case study in how military discipline and moral restraint can collapse under combat pressure.