The Mỹ Lai Massacre is the best known American military atrocity in history. It was committed by U.S. Army soldiers from the Company C of the 1st Battalion, 20th Infantry Regiment, 11th Brigade of the 23rd (American) Infantry Division. Estimates of the total death toll vary from 347 (the American estimate) to 504 (the Vietnamese estimate), and included men, women, children and infants. Some of the women were also raped.
The army initially was quite successful in covering up the massacre, and it was not until October 1969 that the first reports of it appeared in the American media. Public outcry was swift and vociferous. 14 officers were court-martialed for the killings, but only one – by the merest coincidence, the same one who had talked to the media – was convicted. Lt. William Calley was convicted on 20 charges of murder, and served a total of three and a half years for these crimes before being paroled.