A review of events leading to Sihanouk's fall suggests that Cue was right. The arrival of Hanoi-trained cadres in the Cambodian interior led to unrest which local authorities found increasingly hard to contain. By late 1969 the rebellion had reached a point where it seemed an eventual threat to Phnom Penh. Fear of its unchecked growth was a major contributing factor to Sihanouk's overthrow. Although not unexpected, Sihanouk's overthrow was for Hanoi premature, and forced it to change its plans regarding Saigon.