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On the 7th , the division 's 2nd Brigade inserted its three battalions unopposed . After ten days ( and only one significant firefight ) the American troops returned to South Vietnam , leaving the area to the ARVN . Historian Shelby Stanton has noted that " there was a noted lack of aggressiveness " in the combat assa...
On 10 May , Bravo Company , 3rd Battalion , 506th Regiment , 101st Airborne Division , was ambushed by a much larger North Vietnamese force in the Se San Valley . Eight U.S. soldiers were killed and 28 wounded . Among the killed was Spc . Leslie Sabo , Jr . ( posthumously promoted to sergeant ) , who was recommended f...
In the III Corps Tactical Zone , Operation Toan Thang 44 ( Operation Bold Lancer ) , was conducted by the 1st and 2nd Brigades of the U.S. 25th Infantry Division between 6 May and 30 June . The targets of the operation were Base Areas 353 , 354 , and 707 located north and northeast of Tay Ninh , South Vietnam . Once a...
Simultaneous with the launching of Toan Thang 44 , the two battalions of the 3rd Brigade , U.S. 9th Infantry Division , crossed the border 48 kilometers southwest of the Fishhook into an area known as the Dog 's Face from 7 through 12 May . The only significant contact with PAVN forces took place near the hamlet of Ch...
Thieu then authorized Operation Cuu Long , in which ARVN ground forces , including mechanized and armoured units , drove west and northwest up the eastern side of the Mekong River from 9 May – 1 July . A combined force of 110 Vietnamese Navy and 30 U.S. vessels proceeded up the Mekong to Prey Veng , permitting IV Corp...
Other operations conducted from IV Corps included Operation Cuu Long II ( 16 – 24 May ) , which continued actions along the western side of the Mekong . Lon Nol had requested that the ARVN help in the retaking of Kompong Speu , a town along Route 4 southwest of Phnom Penh and 90 miles ( 140 km ) inside Cambodia . A 4 ...
After rescuing the Vietnamese from the Cambodians , ARVN was tasked with saving the Cambodians from the North Vietnamese . The goal was to relieve the city of Kompong Cham , 70 kilometers northwest of the capital and the site of the headquarters of Cambodia 's Military Region I. On 23 May , General Tri led a column of...
= = = Air support and logistics = = =
Aerial operations for the incursion got off to a slow start . Reconnaissance flights over the operational area were restricted since MACV believed that they might serve as a signal of intention . The role of the Air Force in the planning for the incursion itself was minimal at best , in part to preserve the secrecy of...
On 17 April , General Abrams requested that the president approve Operation Patio , covert tactical airstrikes in support of Studies and Observations Group recon elements " across the fence " in Cambodia . This authorization was given , allowing U.S. aircraft to penetrate 13 miles ( 21 km ) into northeastern Cambodia ...
During the incursion itself , U.S. and ARVN ground units were supported by 9 @,@ 878 aerial sorties ( 6 @,@ 012 U.S. / 2 @,@ 966 Vietnamese Air Force ) , an average of 210 per day . During operations in the Fishhook , for example , the USAF flew 3 @,@ 047 sorties and the South Vietnamese Air Force 332 . These tactical...
Within two months , however , the limit of the operational area was extended past the Mekong , and U.S. tactical aircraft were soon directly supporting Cambodian forces in the field . These missions were officially denied by the U.S. and false coordinates were given in official reports to hide their existence . Defens...
The real struggle for the U.S. and ARVN forces in Cambodia was the effort at keeping their units supplied . Once again , the need for security before the operations and the rapidity with which units were transferred to the border regions precluded detailed planning and preparation . This situation was exacerbated by t...
Due to the rapid pace of operations , deployment , and redeployment , coordination of artillery units and their fires became a worrisome quandary during the operations . This was made even more problematic by the confusion generated by the lack of adequate communications systems between the rapidly advancing units . T...
= = Aftermath = =
The North Vietnamese response to the incursion was to avoid contact with allied forces and , if possible , to fall back westward and regroup . PAVN forces were well aware of the planned attack and many COSVN / B @-@ 3 Front military units were already far to the north and west conducting operations against the Cambodi...
As foreseen by Secretary Laird , fallout from the incursion was quick in coming on the campuses of America 's universities , as protests erupted against what was perceived as an expansion of the conflict into yet another country . On 4 May the unrest escalated to violence when Ohio National Guardsmen shot and killed f...
Simultaneously , public opinion polls during the second week of May showed that 50 percent of the American public approved of President Nixon 's actions . Fifty @-@ eight percent blamed the students for what had occurred at Kent State . On both sides , emotions ran high . In one instance , in New York City on 8 May , ...
Reaction in the U.S. Congress to the incursion was also swift . Senators Frank F. Church ( Democratic Party , Idaho ) and John S. Cooper ( Republican Party , Kentucky ) , proposed an amendment to the Foreign Military Sales Act that would have cut off funding not only for U.S. ground operations and advisors in Cambodia...
The Cooper – Church Amendment was resurrected during the winter and incorporated into the Supplementary Foreign Assistance Act of 1970 . This time the measure made it through both houses of Congress and became law on 22 December . As a result , all U.S. ground troops and advisors were barred from participating in mili...
= = Conclusion = =
President Nixon proclaimed the incursion to be " the most successful military operation of the entire war . " General Abrams was of like mind , believing that time had been bought for the pacification of the South Vietnamese countryside and that U.S. and ARVN forces had been made safe from any attack out of Cambodia d...
John Shaw and other historians , military and civilian , have based the conclusions of their work on the incursion on the premise that the North Vietnamese logistical system in Cambodia had been so badly damaged that it was rendered ineffective . The next large @-@ scale North Vietnamese offensive , the Nguyen Hue Off...
The logistical haul discovered , removed , or destroyed in eastern Cambodia during the operations was indeed prodigious : 20 @,@ 000 individual and 2 @,@ 500 crew @-@ served weapons ; 7 @,@ 000 to 8 @,@ 000 tons of rice ; 1 @,@ 800 tons of ammunition ( including 143 @,@ 000 mortar shells , rockets , and recoilless rif...
South Vietnamese forces had performed well during the incursion but their leadership was uneven . General Tri proved a resourceful and inspiring commander , earning the sobriquet the " Patton of the Parrot 's Beak " from the American media . General Abrams also praised the skill of General Nguyen Viet Thanh , commande...
The Cambodian government was not informed of the incursion until it was already under way . It has been argued by some scholars that the incursion heated up the civil war and helped the insurgent Khmer Rouge gather recruits to their cause .
= = = = Unpublished government documents = = = =
Military Assistance Command , Vietnam , Command History 1967 , Annex F. Saigon , 1968 .
= = = = Published government documents = = = =
Gilster , Herman L. The Air War in Southeast Asia : Case Studies of Selected Campaigns . Maxwell Air Force Base AL : Air University Press , 1993 .
Nalty , Bernard C. Air War Over South Vietnam : 1968 – 1975 . Washington DC : Air Force History and Museums Program , 2000 .
Nalty , Bernard C. War Against Trucks : Aerial Interdiction in Southern Laos , 1968 – 1972 . Washington DC : Air Force History and Museums Program , 2005 .
A War Too Long : The USAF in Southeast Asia , 1961 @-@ 1975
Foreign Relations Series
VIETNAM , JULY 1970 – JANUARY 1972
VIETNAM , JANUARY 1969 – JULY 1970
= = = = Secondary accounts = = = =
Chandler , David P. The Tragedy of Cambodian History . New Haven CT : Yale University Press , 1991 .
Deac , Wilfred , Road to the Killing Fields : The Cambodian Civil War of 1970 – 1975 . College Station TX : Texas A & M University , 1997 .
Fulghum , David , Terrence Maitland , et al . South Vietnam on Trial : Mid @-@ 1970 – 1972 . Boston ; Boston Publishing Company , 1984 .
Gitlin , Todd , The Sixties : Years of Hope , Days of Rage . New York : Bantam Books , 1987 .
Karnow , Stanley , Vietnam : A History . New York : Viking Books , 1983 .
Kennedy , Denis , Tracks in the Jungle in The Army at War . Boston : Boston Publishing Company , 1987 .
Lipsman , Samuel , Edward Doyle , et al . Fighting for Time : 1969 – 1970 . Boston : Boston Publishing Company , 1983 .
Morocco , John , Operation Menu in War in the Shadows . Boston : Boston Publishing Company , 1988 .
Morocco , John , Rain of Fire : Air War , 1969 – 1973 Boston : Boston Publishing Company , 1985 .
Nolan , Keith W. Into Cambodia : Spring Campaign , Summer Offensive , 1970 . Novato CA : Presidio Press , 1990 .
Palmer , Dave Richard ( 1978 ) . Summons of the Trumpet : The History of the Vietnam War from a Military Man 's Viewpoint . New York : Ballantine .
Prados , John , The Blood Road : The Ho Chi Minh Trail and the Vietnam War . New York : John Wiley and Sons , 1998 .
Shaw , John M. The Cambodian Campaign : The 1970 Offensive and America 's Vietnam War . Lawrence KS : University of Kansas Press , 2005 .
Shawcross , William , Sideshow : Kissinger , Nixon and the Destruction of Cambodia . New York : Washington Square Books , 1979 .
Sorley , Lewis ( 1999 ) . A Better War : The Unexamined Victories and Final Tragedy of America 's Last Years in Vietnam . New York : Harvest Books . ISBN 0 @-@ 15 @-@ 601309 @-@ 6 .
Stanton , Shelby L. ( 1985 ) . The Rise and Fall of an American Army : U.S. Ground Forces in Vietnam , 1965 – 1973 . New York : Dell . ISBN 0 @-@ 89141 @-@ 232 @-@ 8 .
Tảng , Truong Như ; David Chanoff , Van Toai Doan ( 1985 ) . A Vietcong memoir ( 1985 ed . ) . Harcourt Brace Jovanovich . ISBN 978 @-@ 0 @-@ 15 @-@ 193636 @-@ 6 . - Total pages : 350
= = = = TIME coverage = = = =
" Upsetting the Balance " . Time . 23 March 1970 . Retrieved 10 April 2007 .
" Danger and Opportunity in Indochina " . Time . 30 March 1970 . Retrieved 10 April 2007 .
" The Royal Jugglers of Southeast Asia " . Time . 30 March 1970 . Retrieved 10 April 2007 .
" Mounting Uneasiness in Southeast Asia " . Time . 6 April 1970 . Retrieved 10 April 2007 .
" The Nixon Doctrine 's Test in Indochina " . Time . 13 April 1970 . Retrieved 10 April 2007 .
" The Three @-@ Theater War " . Time . 13 April 1970 . Retrieved 10 April 2007 .
" Indochina 's Crumbling Frontiers " . Time . 20 April 1970 . Retrieved 10 April 2007 .
" A New Horror in Indochina " . Time . 27 April 1970 . Retrieved 10 April 2007 .
" Cambodia : Communists on the Rampage " . Time . 4 May 1970 . Retrieved 10 April 2007 .
" Between the Lines " . Time . 4 May 1970 . Retrieved 10 April 2007 .
" The New Burdens of War " . Time . 11 May 1970 . Retrieved 10 April 2007 .
" At War with War " . Time . 18 May 1970 . Retrieved 10 April 2007 .
" In Search of an Elusive Foe " . Time . 18 May 1970 . Retrieved 10 April 2007 .
" Ten Days — or Ten Years " . Time . 18 May 1970 . Retrieved 10 April 2007 .
" Congress v. the President " . Time . 25 May 1970 . Retrieved 10 April 2007 .
" Cambodia : Now It 's ' Operation Buy Time ' " . Time . 25 May 1970 . Retrieved 10 April 2007 .
" Exodus on the Mekong " . Time . 25 May 1970 . Retrieved 10 April 2007 .
" Nixon 's Campaign for Confidence " . Time . 25 May 1970 . Retrieved 10 April 2007 .
" Cambodia : Toward War by Proxy " . Time . 1 June 1970 . Retrieved 10 April 2007 .
" The Senate : Unloving Acts " . Time . 1 June 1970 . Retrieved 10 April 2007 .
" The Widening Cracks in Nixon 's Cabinet " . Time . 1 June 1970 . Retrieved 10 April 2007 .
" Cambodia : A Cocky New ARVN " . Time . 8 June 1970 . Retrieved 10 April 2007 .
" Indochina : More and More Fighters " . Time . 15 June 1970 . Retrieved 10 April 2007 .
" No Confidence on Cambodia " . Time . 22 June 1970 . Retrieved 10 April 2007 .
" Indochina : The Rising Tide of War " . Time . 22 June 1970 . Retrieved 10 April 2007 .
" New Dangers in Cambodia " . Time . 29 June 1970 . Retrieved 10 April 2007 .
" The Cambodian Venture : An Assessment " . Time . 6 July 1970 . Retrieved 10 April 2007 .
" Cambodia : Struggle for Survival " . Time . 13 July 1970 . Retrieved 10 April 2007 .
" Winding Up the Cambodian Hard Sell " . Time . 13 July 1970 . Retrieved 10 April 2007 .
" Gloom in the Land of Smiles " . Time . 27 July 1970 . Retrieved 10 April 2007 .
" The Discreet US Presence " . Time . 3 August 1970 . Retrieved 10 April 2007 .