 <unk> with Lon Nol ARVN forces attacked the PRG <unk> complexes . Moving across the border in Cambodia on 30 March elements of the PRG and NLF were surrounded in their bunkers by South Vietnamese forces flown in by helicopter . <unk> they awaited till nightfall and then with security provided by the NLF 7th division they broke out of the <unk> and fled north to unite with the COSVN in the Cambodian <unk> province in what would come to be known as Escape of the Provisional Revolutionary Government . Trương <unk> <unk> was the Minister of Justice in the PRG and he recounts 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 <unk> , Cambodia against ARVN forces . 
