During the massacre, Thompson and his Hiller OH-23 Raven crew, Andreotta and Colburn, stopped many killings by threatening and blocking American officers and enlisted soldiers of Company C, 1st Battalion, 20th Infantry Regiment, 11th Brigade, 23rd Infantry Division. (Wiki)
The "And babies" poster transformed a horrific scene of American war crimes into a visceral indictment of the Vietnam War. By overlaying the site of the atrocity with a soldier's own confession of killing infants, the Art Workers Coalition created a haunting masterpiece of propaganda art that created a turning point in global anti-war outrage.
In March 1968, U.S. soldiers of Charlie Company, led by Lt. William Calley, entered the village of Mỹ Lai and murdered, raped, and tortured over 500 unarmed civilians, the majority being women, children, and the elderly. The atrocity was only halted when helicopter pilot Hugh Thompson landed his helicopter between the soldiers and the remaining villagers, ordering his crew to fire on the U.S. troops if the killing continued. The military initially attempted to cover up the mission, reporting it as a victory over enemy soldiers. When the truth was revealed a year later, it sparked global outrage and has affected the reputation of the U.S. military to this day. Believe it or not, before Vietnam, American citizens overwhelmingly trusted the military and thought they made the best decisions for the country, and expected them to be honest about any wrongdoing.