At the time Nixon took office, there were over 500,000 American soldiers in
Southeast Asia. Over 30,000 U.S. military personnel serving in the Vietnam War had been killed since 1961, with approximately half of those deaths occurring in 1968. The war was broadly unpopular in the United States, with widespread, sometimes violent
protests taking place on a regular basis. The
Johnson administration had agreed to suspend bombing in exchange for negotiations without preconditions, but this agreement never fully took force. According to
Walter Isaacson, soon after taking office, Nixon had concluded that the Vietnam War could not be won and he was determined to end the war quickly. Conversely, Black argues that Nixon sincerely believed he could intimidate
North Vietnam through the
Madman theory. Regardless of his opinion of the war, Nixon wanted to end the American role in it without the appearance of an American defeat, which he feared would badly damage his presidency and precipitate a return to
isolationism. He sought some arrangement which would permit American forces to withdraw, while leaving South Vietnam secure against attack. In mid-1969, Nixon began efforts to negotiate peace with the North Vietnamese, but negotiators were unable to reach an agreement. With the failure of the peace talks, Nixon implemented a strategy of "
Vietnamization," which consisted of increased U.S. aid and
Army of the Republic of Vietnam (ARVN) troops taking on a greater combat role in the war. To great public approval, he began phased troop withdrawals by the end of 1969, sapping the strength of the domestic anti-war movement. Despite the failure of
Operation Lam Son 719, which was designed to be the first major test of the ARVN since the implementation of Vietnamization, the drawdown of American soldiers in Vietnam continued throughout Nixon's tenure.
Vietnamization 1971 During the quiet year 1971 that saw the removal of nearly all American ground forces, Hanoi was building up forces for a full-scale invasion of the South. In late March 1972, the
People's Army of Vietnam (PAVN) launched a major cross-border conventional surprise attack on the South. They expected the peasants to rise up and overthrow the government; they did not. They expected the South's army to collapse; instead the ARVN fought very well indeed. They did not expect heavy US bombing, which disrupted their plans and forced a retreat. In 1971 Nixon sent massive quantities of hardware to the ARVN, and gave Thieu a personal pledge to send air power if Hanoi invaded. The year 1971 was eerily quiet, with no large campaigns, apart from a brief ARVN foray into Laos to which was routed by the PAVN.
1972: LINEBACKER I North Vietnamese commander
Võ Nguyên Giáp decided that since the American forces had left he could invade in conventional fashion and defeat Saigon's demoralized army, the ARVN. His assumption that Vietnamization had failed was soon proven wrong. Saigon had started to exert itself; new draft laws produced over one million well-armed regular soldiers, and another four million in part-time, lightly armed self-defense militia. In March–April, 1972 Hanoi invaded at three points from north and west with PAVN regulars spearheaded by tanks. On March 30, 30,000 PAVN troops, supported by regiments of tanks and artillery, rolled southward across the
Vietnamese Demilitarized Zone (DMZ) that separated the two Vietnams. A second PAVN force of 20,000 crossed the border from their sanctuaries in Cambodia into areas north of Saigon. A third PAVN invasion moved in from eastern Laos. This was conventional old- fashioned warfare, reminiscent of
North Korea's invasion of South Korea in 1950. The outcome was quite different however. Nixon ordered LINEBACKER I, with 42,000 bombing sorties over North Vietnam. Hanoi was evacuated. Nixon also ordered the mining of North Vietnam's harbors, a stroke LBJ had always vetoed for fear of Soviet or Chinese involvement, But thanks to
détente the Soviets and Chinese held quiet. The ARVN, its morale stiffened by American resolve, rose to the occasion. With massive tactical air support from the US, it held the line. As in Tet, the peasants refused to rise up against the GVN. "By God, the South Vietnamese can hack it!" exclaimed a pleasantly surprised General
Creighton Abrams. Since the PAVN's conventional forces required continuous resupply in large quantities, the air campaign broke the back of the invasion and the PAVN forces retreated north. However they did retain control of a slice of territory south of the DMZ. There the NLF, renamed the "
Provisional Revolutionary Government of South Vietnam" (PRG) was established; it welcomed diplomats from the
Communist world, including
Castroist Cuba, and served as one of the launch points of the 1975 invasion. After the failed Easter Offensive the government of
Nguyễn Văn Thiệu made a fatal strategic mistake. Overconfident of its military prowess, it adopted a policy of static defense that made its units vulnerable; worse, it failed to use the breathing space to reorganize and rebuilt its faulty command structure. The departure of American forces and American money lowered morale in both military and civilian South Vietnam. Desertions rose as military performance indicators sank, and no longer was the US looking over the shoulder demanding improvement. Politics, not military need, still ruled the South Vietnamese Army. On other side, the PAVN had been badly mauled—the difference was that it knew it and it was determined to rebuild. Discarding guerrilla tactics, Giap three years to rebuild his forces into a strong conventional army. Without constant American bombing it was possible to solve the logistics problem by modernizing the
Ho Chi Minh trail with 12,000 more miles of roads. Brazenly, he even constructed a pipeline along the Trail to bring in gasoline for the next invasion.
Linebacker II 1972 Late in 1972 election peace negotiations bogged down; Thieu demanded concrete evidence of Nixon's promises to Saigon. Nixon thereupon unleashed the full fury of air power to force Hanoi to come to terms. Operation LINEBACKER II, in 12 days smashed many targets in North Vietnam cities that had always been sacrosanct. US policy was to try to avoid residential areas; the
North Vietnamese Politburo had already evacuated civilians not engaged in essential war work. The Soviets had sold Hanoi 1,200
surface-to-air missiles that proved effective against the
B-52s. 34
strategic bombers have been destroyed or damaged. An American negotiator in Paris observed that: Prior to LINEBACKER II, the North Vietnamese were intransigent. After LINEBACKER II, they were shaken, demoralized, and anxious to talk about anything. Beijing and Moscow advised Hanoi to agree to the
Paris Peace Accords; they did so on January 23, 1973. The
United States Air Force interpreted the quick settlement as proof unrestricted bombing of the sort they had wanted to do for eight years had finally broken Hanoi's will to fight; other analysts said Hanoi had not changed at all. In Paris, the North Vietnamese refused to change the terms they had agreed to in the October 1972 agreement.
Bombing of Cambodia, 1969 In March 1969, Nixon approved a secret
B-52 carpet bombing campaign (code-named
Operation Menu) of North Vietnamese positions in Cambodia without the consent of Cambodian leader
Norodom Sihanouk. In early 1970, Nixon
sent U.S. and South Vietnamese soldiers into
Cambodia to attack North Vietnamese bases, expanding the ground war out of Vietnam for the first time. Even within the administration, many disapproved of the incursions into Cambodia, and anti-war protesters were irate. The bombing of Cambodia continued into the 1970s in support of the Cambodian government of
Lon Nol—which was then battling a
Khmer Rouge insurgency in the
Cambodian Civil War—as part of
Operation Freedom Deal.
Bombing of Laos, 1971 Ending the Vietnam War, 1973–1974 In the aftermath of the Easter Offensive, peace talks between the United States and North Vietnam resumed, and by October 1972 a framework for a settlement had been reached. Objections from South Vietnamese President
Nguyễn Văn Thiệu derailed this agreement, and the peace talks broke down. After years of fighting, the
Paris Peace Accords were signed at the beginning of 1973. The agreement implemented a cease fire and allowed for the withdrawal of remaining American troops; however, it did not require the 160,000
North Vietnam Army regulars located in the South to withdraw. By March 1973, U.S. military forces had been withdrawn from Vietnam. Once American combat support ended, there was a brief truce, but fighting quickly broke out again, as both South Vietnam and North Vietnam violated the truce. Congress effectively ended any possibility of another American military intervention by passing the
War Powers Resolution over Nixon's veto. ==Bangladesh, India and Pakistan==