On 25 December 1978 , 150,000 Vietnamese troops invaded Attack Democratic Kampuchea and overran Destroying the Kampuchean Revolutionary Army in just two weeks , thereby ending Process_end the excesses of Pol Pot 's regime , which had been responsible for the deaths Death of almost a quarter of all Cambodians between 1975 and December 1978 .

While the effectiveness of the bombing and the number of Cambodians killed Killing by U.S. bombing Attack is in dispute , civilian fatalities Catastrophe were easily in the tens of thousands .

Some 275,000–310,000 Cambodians , 20,000–62,000 Laotians , and 58,220 U.S. service members also died Death in the conflict , and a further 1,626 remain missing Bodily_harm in action .