Attacks by U.S. and Saigon army forces against border posts and villages in Cambodia intensified from the early 1960s, causing hundreds of casualties a year. Later, Vietnamese peasants and guerrillas fled for refuge to border areas in Cambodia, particularly after the murderous U.S. military operations in South Vietnam in early 1967, giving rise to cynical charges from Washington, echoed in the media, about Communist encroachment into neutral Cambodia.
