The Fishhook Kampong Cham Province, southeast Cambodia that protrudes into Bình Long and Tây Ninh provinces, Vietnam, approximately 80 km northwest of Saigon. The area consisted of generally flat plains adjacent to Mimot northeast through roughly rolling plains; and east to the roughly dissected hills and low mountains near O'Rang. Multi-canopied, dense undergrowth forest was the dominant natural vegetation throughout the area. Rubber plantations were found primarily in the western sectionwas the name given to a salient of
During the Vietnam War the Fishhook was a base and rest area for the North Vietnamese Army and the Vietcong and one of the terminus points of the Ho Chi Minh trail/Sihanouk Trail. The NVA established Base Areas 352 and 353 in the Fishhook and elements of the NVA 7th Division were also based there. US Intelligence agencies believed that the Central Office for South Vietnam or COSVN, the NVA’s political and military headquarters was also located within the Fishhook
On 24 April 1969, a further B-52 raid took place on the suspected location of COSVN. A platoon from MACV-SOG was inserted to conduct a post-strike intelligence-gathering raid. The 24-man MACV-SOG team came under fire as soon as it was inserted and 14 men were eventually evacuated some 8 hours later. Two Americans and 5 Montagnards were killed, while one American, MSGT Jerry "Mad Dog" Shriver was listed as MIA, later changed to presumed dead.
On 1 May 1970, the Fishhook was attacked as part of the Cambodian Incursion. The 3d ARVN Airborne Brigade air assaulted into the area north of the Fishhook to seal off escape routes and begin operations to the south. Simultaneously, Taskforce Shoemaker comprising the 3rd Brigade, 1st Cavalry Division on the west and the 11th Armored Cavalry Regiment on the south and east attacked north across the Cambodian Border. The 1st Squadron, 9th Cavalry conducted screening operations in the task force area of operations while elements of the 9th ARVN Regiment and the 1st ARVN Armored Cavalry Regiment screened to the east in Binh Long Province adjacent to the Fishhook. All elements then conducted search and interdiction operations to locate and exploit NVA lines of communication and cache sites. The attack did not discover COSVN, but instead found “The City”, a vast logistics area covering 3 square km, comprising 182 storage bunkers containing 1282 individual weapons, 202 crew-served weapons, 30 tons of rice and large amounts of ammunition and explosives. Documents indicated that the City was the supply base for the NVA 7th Division.
- "NSA Cryptologic History Series, Focus on Cambodia". National Security Agency. January 1974. pp. 11–12.
- Tolson, LT GEN John (1973). Vietnam Studies: Airmobility 1961-1971. Department of the Army. p. 220. ISBN 978-1-931641-90-6.
- Shawcross, William (1979). Sideshow: Kissinger, Nixon, and the Destruction of Cambodia. Washington Square Press. pp. 23–24. ISBN 978-0-8154-1224-3.
- Tolson, p.222
- Tolson, p.226-228