Delaying the fall of the capital Phnom Penh to the Khmer Rouge
Accelerated collapse of rural Cambodian society, displacement of tens of thousands from countryside to city, increased social polarization[1]
Pushing North Vietnamese troops further into Cambodia away from the South Vietnamese border[2]
Khmer Rouge used civilian loss to promote recruitment, strengthened the hard-liners within the CPK[3]
Casualties
Cambodian casualties: 50,000–150,000 (per Ben Kiernan; other estimates vary widely)[4][5][6][7][8] This figure refers to the entirety of the U.S. bombing of Cambodia, including the Operation Menu bombings.
Vietnamese casualties: unknown
As time went on, most of the bombing was carried out to support the Cambodian Government of Lon Nol in its struggle against the communist Khmer Rouge. The area in which the bombing took place was expanded to include most of the eastern one-half of Cambodia. The bombing was extremely controversial and led the U.S. Congress to pass the War Powers Resolution.[10]
Operation Freedom Deal followed and expanded the bombing of Cambodia conducted under Operation Menu in 1969 and 1970. Most of the bombing was carried out by U.S. Air Force (USAF) B-52 bombers. While the effectiveness of the bombing and the number of Cambodians killed by U.S. bombing remains in dispute, civilian fatalities were easily in the tens of thousands.[11]
^Chandler, David (2000). Brother Number One: A Political Biography of Pol Pot, Revised Edition. Chiang Mai, Thailand: Silkworm Books. pp. 96–98.