In the summer of 1950 , North Korea attacked South Korea , and the 1st Cavalry Division was rushed to Korea to help shore up the Pusan Perimeter . From 26 to 29 July 1950 , the 7th Cavalry Regiment , one of the Division 's three infantry regiments , killed at least 163 South Korean civilians in an incident now known as the No Gun Ri massacre . While the 7th Cavalry was directly responsible , Divisional commanders , including General Hobart R. Gay , had given them orders to do so
No Gun Ri massacre
No Gun Ri massacre
1st Cavalry Division (United States)