Pedzisa mutsara unotevera: Hwaro hwayo hwakaitika musi wa 2 December 1978 muKratié Province pedyo nomuganhu neVietnam pamusangano wevanhu makumi manomwe vanopesana neCambodia vakatsunga kupidigura hurumende yaPol Pot. Heng Samrin akasarudzwa somutungamiri wepamberi uye mukati memavhiki mashomanana simba rayo rakapararira zvikuru kumativi ose emuganhu. Nzvimbo yacho yakanga iri sangano reCambodian rezvematongerwe enyika-rechiuto rakanga risina kuenzana iro rakaruramisa
Kupinda kweVietnam muCambodia, kuchikurumidzisa kukundwa kweDemocratic Kampuchea yeKhmer Rouge. Kwakaunza hwaro hwerudzi rutsva runonzi 'People's Republic of Kampuchea' uye kuvakwazve kwenyika yakaparadzwa uye yakashaiwa zvikuru. Sangano iri rakachinja mazita akasiyana-siyana sezvo rakawedzera uye rakashandurwa kuti rienderane nezvakaitika kare muCambodia.