Coordinating with Lon Nol ARVN forces attacked the PRG headquarter complexes . Moving across the border in Cambodia on 30 March elements of the PRG and NLF was surrounded in their bunkers by South Vietnamese forces flown in by helicopter . Surrounded they awaited till nightfall and then with security provided by the NLF 7th division they broke out of the encirclement and fled north to unite with the COSVN in the Cambodian Kratie province in what would come to be known as Escape of the Provisional Revolutionary Government . Trương Như Tảng was the Minister of Justice in the PRG and he recount that during the march to the northern bases was day after day of forced marches broken up by B @-@ 52 bombing raids . Just before the column crossed route 7 on their way north they received word that on 3 April the 9th Division had fought and won a battle near the city of Krek , Cambodia against ARVN forces .