9 August 1978

July 29, 1978: Khmer Rouge Defence Minister Son Sen arrives in Peking to seek China’s military commitment against Vietnam. The Chinese leaders advise him to begin preparations for a protracted guerrilla war by digging tunnels, setting up arms caches, and mobilizing the masses.

July 29, 1978: More than 300 Cambodians flee to Thailand, taking advantage of laxer security by the Khmer Rouge due to IENG Sary’s visit. @Refugees says another reason is that the KR started purging the relatives of those who have already fled Cambodia.