Nha Trang Cycling To Hoi An is a great way to see the country from the beautiful beach city of Nha Trang to riding back roads to historic Hoi An. The My Lai Massacre approximately (Vietnamese: thảm sát Mỹ Lai) was the mass murder conducted by U.S. Army forces on March 16, 1968, of 347 to 504 unarmed citizens in South Vietnam, all of whom were civilians and the majority of whom were women, children, and elderly people.