Operation Chenla I

Operation Chenla I
Part of Cambodian Civil War, Vietnam War
Areas of Cambodia under government control August 1970.jpg
Map showing the areas under Communist control.
DateAugust 1970 – February 1971
Cambodia Khmer RepublicProvisional Revolutionary Government of the Republic of South Vietnam Viet Cong
 North Vietnam
Commanders and leaders
Um SavuthTrần Văn Trà

Operation Chenla I or Chenla One was a major military operation conducted by the Khmer National Armed Forces (FANK) during the Cambodian Civil War. It began in late August 1970 and ended in February 1971, due to the FANK High Command's decision to withdraw some units from Tang Kauk to protect Phnom Penh after Pochentong airbase was attacked.


Following the overthrow of the Cambodian head of state, Prince Norodom Sihanouk, in a coup d'état in March 1970 and its replacement by the pro-US Khmer Republic, the re-christened Khmer National Armed Forces (FANK) focused on expelling all People's Army of Vietnam (PAVN) and Viet Cong (VC) forces from their border sanctuaries in eastern Cambodia after the new President of the Khmer Republic, Marshal Lon Nol, issued an ultimatum. However, from May 1970, the ill-prepared FANK was quickly placed at a strategic disadvantage following the seizure of the northeastern areas of the country (the provinces of Stung Treng, Ratanakiri, Kratie, and Mondulkiri) by the PAVN in response to the ultimatum and the loss to the Khmer Rouge insurgents of several peripheral eastern and southwestern Cambodian provinces (Kampot, Koh Kong, Kampong Cham, Preah Vihear, plus portions of Siem Reap, Oddar Meanchey, Kampong Thom, Prey Veng, and Svay Rieng Provinces) during that same year.

In July 1970, the FANK High Command decided to take advantage of a lull in PAVN/VC activity as an opportunity to regain the strategic initiave and raise the morale of the FANK troops by retaking large expanses of rich rice-growing areas in northeastern Cambodia not under the Khmer Rouge control. Lon Nol made preparations for an offensive plan codenamed 'Chenla' to be launched in late August of that same year. An ANK task-force consisting of a dozen infantry battalions – which included several 'repatriated' Khmer Krom volunteer battalions recruited in South Vietnam – supported by armour and artillery was assembled for the operation, which relied on limited ground and air support from the Army of the Republic of Vietnam (ARVN) and the Republic of Vietnam Air Force (RVNAF).[1][2]

Other Languages
Tiếng Việt: Chiến dịch Chenla I