Joint warfare in South Vietnam 1964-1968

See also: Government of the Republic of Vietnam

See also: Air operations against North Vietnam

In the Vietnam War, after the Gulf of Tonkin incident in 1964 and the continuing political instability in the South, the United States made a policy commitment to begin joint warfare in South Vietnam, involving the commitment of large-scale combat forces from the United States and allied countries. It was no longer assumed the Republic of Vietnam could create a desirable situation without major external assistance. This phase of the war lasted until the election of Richard M. Nixon, and the change of U.S. policy to Vietnamization, or giving the main combat role back to the South Vietnamese military.

Robert McNamara suggests that the overthrow of Duong Van Minh by Nguyen Khanh, in January 1964, reflected different U.S. and Vietnamese priorities.

"And since we still did not recognize the North Vietnamese and Vietcong and North Vietnamese as nationalist in nature, we never realized that encouraging public identification between Khanh and America may have only reinforced in the minds of many Vietnamese that his government drew its support not from the people, but from the United States."

Minh's government had been exploring neutralist solutions, which did not fit within the broad anti-communist containment policy of the United States.

Roughly until mid-1965, the SVN-US strategy still focused around pacification, both the earlier Strategic Hamlet Program and its successors, but it was increasingly irrelevant in the face of larger and larger VC conventional attacks. Military Assistance Command, Vietnam began to refer to the "two wars", one against conventional forces, and the other of pacification. The former was the priority for U.S. forces, as of 1965, assuming the South Vietnamese had to take the lead in pacification. Arguably, however, there were three wars:

• Ground combat in South Vietnam
• Air operations against North Vietnam
• Pacification in South Vietnam

There were, however, changes in the overall situation from early 1964 to the winter of 1965-1966, from 1966 to late 1967, and from late 1968 until the U.S. policy changes with the Nixon Administration.

While the discussion following splits into military and political/civil strategies, that is a Western perspective. Relevant Communist theory takes a more grand strategic view than did the U.S. and South Vietnam, in their concept of dau trinh, or "struggle", where the goal is always political; there are both military and organizational measures that support the political goal.

Military strategy

Military developments in this period should be considered in several broad phases that do not fit neatly into a single year:

• Gradual intensification, and North Vietnamese exploration of a changed ground environment. Significant events include the Battle of the Ia Drang and the Battle of Bong Son, as well as joint "search and destroy" operations against Communists. During this period, the U.S. concept of the joint war developed.
• A North Vietnamese strategic buildup for what they saw as decisive actions in 1967-1968
• The 1967-1968 campaign, which appears to have had a broader concept, not executed, than the most obvious aspects of the Battle of Khe Sanh and the Tet Offensive.

The U.S. plans

Some fundamental decisions about U.S. strategy, which would last for the next several years, took place in 1965. Essentially, there were three alternatives:

1. Bombing, enclave and rural security, principally supported by U.S. Ambassador to South Vietnam, Maxwell Taylor GEN (U.S. Army, retired)
2. Attrition of VC bases and secondarily personnel, the focus of GEN William Westmoreland, commanding general, Military Assistance Command, Vietnam. Westmoreland, in a March 26 message, said that it would take six months for air attacks to take effect, and third-country ground troops were needed immediately. Westmoreland stated "search and destroy" as a goal in May
3. Emphasis on rural security, from a number of U.S. Marine Corps officer including then-LTG Leonard Cushman, then-MG Victor Krulak, and others

Even with these three approaches, there was still significant doubt, in the U.S. government, that the war could be ended with a military solution that would place South Vietnam in a strongly anticommunist position. In July, two senior U.S. Department of State officials formally recommended withdrawal to President Lyndon B. Johnson; Secretary of Defense Robert McNamara, at the same time, saw the situation as bad but potentially retrievable with major escalation.

Westmoreland's "ultimate aim", was:

"To pacify the Republic of [South] Vietnam by destroying the VC—his forces, organization, terrorists, agents, and propagandists—while at the same time reestablishing the government apparatus, strengthening GVN military forces, rebuilding the administrative machinery, and re-instituting the services of the Government. During this process security must be provided to all of the people on a progressive basis." Source: Directive 525-4 (MACJ3) 17 September 1965: Tactics and Techniques for Employment of US Forces in the Republic of Vietnam

Westmoreland complained that, "we are not engaging the VC with sufficient frequency or effectiveness to win the war in Vietnam." He said that American troops had shown themselves to be superb soldiers, adept at carrying out attacks against base areas and mounting sustained operations in populated areas. Yet, the operational initiative— decisions to engage and disengage—continued to be with the enemy.

North Vietnamese strategic buildup

North Vietnam developed a new plan to move from the Ho Chi Minh trail in Cambodia, in central Vietnam (i.e., ARVN II Corps tactical zone), with a goal of driving through to the seacoast over Highway 19, splitting South Vietnam in half. For this large operation, the PAVN created its first division headquarters, under then-brigadier general Chu Huy Man. This goal at first seemed straightforward, but was reevaluated when major U.S. ground units entered the area, first the United States Marine Corps at Danang, and then the 1st Cavalry Division (Airmobile), the "First Cav". In particular, the PAVN were not sure of the best tactics to use against the air assault capability of the 1st Cav, so BG Man revised a plan to bring to try to fight the helicopter-mobile forces on terms favorable to the North Vietnamese. They fully expected to incur heavy casualties, but it would be worth it if they could learn to counter the new U.S. techniques, inflict significant casualties on the U.S. Army, and, if very lucky, still cut II CTZ in half. That planned movement was very similar to the successful PAVN maneuver in 1975.

The resulting campaign is called the Battle of the Ia Drang, with a followup at the Battle of Bong Son, but Ia Drang actually had three major phases:

• PAVN attack on the Plei Me CIDG camp, ambushing the expected heavy rescue force and possibly attracting the 1st Cav,
• Putting simultaneous pressure on Plei Me and Pleiku, so II CTZ would need to call in U.S. reinforcements; this is what became the Battle of the Ia Drang in popular Western terms, but has been called either the U.S. Battle of the Ia Drang or the Pleiku Campaign,
• An ARVN counteroffensive against the PAVN troops retreating into Cambodia, an action fought by the ARVN Airborne Brigade with U.S. air and artillery support.

In the larger Battle of Bong Son approximately a month later, which extended into 1966, 1st Cav drew their own lessons from what they believed the PAVN developed as countertactics to aiir assault, and used obvious helicopters to cause the PAVN to retreat onto very reasonable paths to break away from the Americans — but different Americans had silently set ambushes, earlier, across those escape routes.

By late 1966, however, North Vietnam began a buildup in the northwest area of the theater, in Laos, the southernmost part of the DRV, the DMZ, and in the northern part of the RVN.

North Vietnamese plans for decisive action

It is known that the North Vietnamese planned something called the Tet Mau Than or Tong Kong Kich/Tong Kong Ngia (TCK/TCN, General Offensive/Uprising) One of the great remaining questions is if this was a larger plan into which the Battle of Khe Sanh and Tet Offensive were to fit. If there was a larger plan, to what extent were North Vietnamese actions in the period of this article a part of it? Douglas Pike believed the TCK/TCN was to have three main parts:

• October-November 1967: "concentrated" fighting methods, with raids against small to medium military bases such as Con Thien or Loc Ninh, essentially as large raids: "not a decisive battle but a punitive one"
• January-March 1968: "independent" fighting methods, often small, such as the squads that hit the U.S. Embassy. The operational message was that there were no safe areas.
• Something identified in their message against a large target, a "psychological backbreaker" against a target like Khe Sanh, Hue, Kontum, or Saigon.

Pike used Dien Bien Phu as an analogy for the third phase, although Dien Bien Phu wa an isolated, not urban, target. Losing elite troops during the Tet offensive never let them develop the "second wave" or "third phase" "We don't ever know what the second wave was; we have never been able to find out because probably only a couple of dozen people knew it." The description of the three fighting methods is consistent with the work of Nguyen Chi Thanh, who commanded forces in the south but died, of natural causes, in 1967; Thanh may very well have been among those couple of dozen. He described it as consistent with the armed struggle (dau trinh) theory espoused by Vo Nguyen Giap but opposed by the politically oriented Truong Chinh. Pike said he could almost hear Truong Chinh saying, "You see, it's what I mean. You're not going to win militarily on the ground in the South. You've just proven what we've said; the way to win is in Washington." Alternatively, Giap, in September 1967, had written what might well have been a political dau trinh argument: the U.S. was faced with two unacceptable alternatives: invading the North or continue a stalemate. Invasion of "a member country of the Socialist camp" would enlarge the war, which Giap said would cause the "U. S. imperialists...incalculable serious consequences." As for reinforcements, "Even if they increase their troops by another 50,000, 100,000 or more, they cannot extricate themselves from their comprehensive stalemate in the southern part of our country."

The answer may be somewhere inbetween: Giap indeed wanted to draw American forces away from the coastal urban areas, but tried too hard for a victory at Khe Sanh.

The "other war"

1966 was the year of considerable improvement of command relationships, still under Westmoreland, for what Westmoreland considered the less interesting "other war" of rural development. There were frequent changes of names of aspects of this mission, starting in 1964, but eventually, the GVN and US agreed on the term Revolutionary Development (RD), which was to continue in a variety of development activities. The term, apparently coined by Premier and general Nguyen Cao Ky, was agreed to be defined as

RD is the integrated military and civil process to restore, consolidate and expand government control so that nation building can progress throughout the Republic of Vietnam. It consists of those coordinated military and civil actions to liberate the people from Viet Cong control; restore public security; initiate political, economic and social development; extend effective Government of Vietnam authority; and win the willing support of people toward these ends.

"Search and Destroy" gave way after 1968 to "clear and hold", when Creighton Abrams replaced Westmoreland.

Westmoreland was principally interested only in overt military operations, while Abrams looked at a broader picture. MACV advisors did work closely with 900,000 local GVN officials in a well-organized pacification program called CORDS (Civil Operations and Revolutionary Development.) It stressed technical aid, local self government, and land distribution to peasant farmers. A majority of tenant farmers received title to their own land in one of the most successful transfer projects in any nation. On the other hand, hundreds of thousands of peasants entered squalid refugee camps when CORDS moved them out of villages that could not be protected.

In the Phoenix Program (part of CORDS with a strong CIA component) GVN police identified and arrested (and sometimes killed) the NLF secret police agents engaged in assassination.

Fighting continues

On February 6, the VC attacked U.S. facilties at Pleiku, killing 8 and destroying 10 aircraft. President Johnson, on February 7-8, responded with the first specifically retaliatory air raid, Operation FLAMING DART (or, more specifically, FLAMING DART I), of the broader Operation ROLLING THUNDER plan, which had not yet officially started.

The Pleiku attack seems to have been a vital decision point for the U.S. While the introduction of U.S. ground troops had been discussed for years, there were no specific plans. Bundy's memorandum to Johnson about the attack, on 7 February, did not propose the introduction of combat troops.

Johnson made no public announcements, although the U.S. press reported it. The attack was carried out by U.S. Navy aviators from an aircraft carrier in the South China Sea. FLAMING DART II was a response to an attack on Qui Nhon on March 10. In response, initially unknown to the U.S., the North Vietnamese received their first S-75 Dvina (NATO reporting name SA-2 GUIDELINE) surface-to-air missiles, although civilian officials assumed they would not be used. In fact, the missiles were used, setting off upward spiral of air attack and air defense.

It must be emphasized that for most of the war, the bulk of the attacks on the North came, at first, from Navy carriers offshore. When the bombing escalated, they were joined by U.S. Air Force fighter-bombers flying from bases in Thailand. While there were occasional strikes on the DMZ and the southern part of the DRV from bases in the South, especially when South Vietnamese aircraft participated, the U.S. bases in the RVN primarily supported operations there. Da Nang was the primary South Vietnamese base for such strikes.

Bases in SVN, however, were accessible to the VC, by ground attack, or with rockets and mortars of only a few miles' range. As FLAMING DART progressed and the detailed planning for the major air escalation of ROLLING THUNDER, Westmoreland was concerned about the security of the exposed U.S. air bases in the south. On February 22, he sent his deputy, LTG John Throckmorton, to inspect the Marine aviation base at Da Nang; Throckmorton reported that a full Marine Expeditionary Brigade, with three infantry battalions and supporting elements, were needed to ensure its defense. Westmoreland, according to Davidson, believed a two-battalion MEB was more politically acceptable, but submitted that request.

The President approved sending two Marine battalions on February 26. Other than possibly Westmoreland, they were seen purely as defensive troops. Westmoreland denies assuming they would be available for missions outside the base. The Pentagon Papers suggest he did see a wider mission, but there is no strong evidence that he did.

Ambassador Taylor, a retired general with extensive combat experience, objected. His calculation was that one battalion would protect the base from any plausible direct VC ground attack, but that six, not three, battalions would be necessary to establish a sufficiently large area to prevent the VC firing on Da Nang with standard and easily portable 81mm mortars. The Joint Chiefs of Staff disagreed, and forwarded Westmoreland's request, with their agreement, on 26 February.

ROLLING THUNDER buildup, March

Shortly before Johnson approved the sustained Operation ROLLING THUNDER plan on March 13, the Da Nang security force arrived on March 8. in response to Westmoreland's request of February 22 reflecting a concern with VC forces massing near the Marine air base at Da Nang, 3500 Marine ground troops arrived, the first U.S. large ground combat unit in Vietnam.

President Johnson ordered Chief of Staff of the Army GEN Harold Johnson to assess the situation, already doubting the air offensive before it seriously began. GEN Johnson reported, in Vietnam between March 5 and 12, reported back on 14 March. He was seriously concerned about the situation, and proposed external forces be brought in to free the ARVN for offensive action because "what the situation requires may exceed what the Vietnamese can be expected to do." He proposed a U.S. division be sent preferentially to the Central Highlands (II Vietnamese corps area; Kontum, Pleiku, and Darlac provinces) or to the Bien Hoa/Tan Son Nhut area nearer to Saigon. McNamara, however, did not think such action would make enough ARVN troops available and preferred that a Republic of Korea division be sent rather than U.S. troops. GEN Johnson also suggested a four-division force be raised under the SEATO treaty and used to block infiltration.

GEN Johnson said a decision was needed "now to determine what the Vietnamese should be expected to do for themselves and how much more the U.S. must contribute directly to the security of South Vietnam." Secretary McNamara noted in the margin: "Policy is: anything that will strengthen the position of the GVN will be sent..." Assistant Secretary of Defense for International Affairs sent a key memo to McNamara. His "70%" justification for staying in Vietnam was to protect U.S. reputation, with a lesser role of preventing major Chinese intervention, the latter not having been documented. Essentially, he saw no way to extricate the U.S. The memo also said there was a "50% chance of coup within 3 weeks," and, SVN has been cut in two with GVN control in north reduced to enclaves.

Carrot and Stick, April

Johnson's main public announcement at the time, however, was an April 7 speech, in which he offered economic support to North Vietnam, and Southeast Asia in general, if it would stop military action. This offer was quite in keeping with his goals for development, the Great Society, in the United States, and was likely a sincere offer. That he saw such an offer as attractive to the enemy, however, is an indication of his lack of understanding of the opposing ideology.

More elaboration of the proposal was in National Security Action Memorandum 329 This initially classified (but at the lowest level) document, among other things, asked for specific recommendations of a "reviews of the pros and cons" of increasing U.S. aid even before a regional development program started.

The Director of Central Intelligence, wrote to McNamara and others that the ROLLING THUNDER campaign was not a serious deterrent to the DRV, and warned against putting more U.S. troops into combat roles. McCone said that this would merely encourage the Soviets and Chinese to take a low-risk course of supporting infiltration.

As these proposals were made to the North, on 13 April 1965, joint RVN-US discussions agreed that the ARVN force levels were inadequate. The manning level was increased, to increase RVN infantry battalions from 119 to 150. The new battalions were generally added to existing regiments, to avoid the need of creating more headquarters units. By the end of 1965, twenty-four were either in the field or in training areas.

In April, Johnson authorized the deployment of an additional two Marine battalions and up to 20,000 support personnel. Again without public announcement, he changed the rules of engagement to permit the Marines to go beyond static defense, and to start offensive sweeps to find and engage enemy forces.

RVN reverses in May

A VC unit, estimated to be in two-regiment strength, fought the Battle of Song Be, the capital of Phuoc Long province, about 100 miles from Saigon, on 11 May. Much farther in the north, later in the month, they ambushed an ARVN force in the north, near Quang Ngai, badly hurting ARVN relief troops and leaving two battalions combat ineffective.

Westmoreland obtained Taylor's agreement on a plan for reinforcement. It had three phases, the first two establishing security for Allied bases and then an offensive strategy, beginning with enclaves on the cost, and moving inland.

The first phase extended the security perimeter of the bases so that the facilities were out of range of light artillery. In the second stage, the U.S. forces, in coordination with the RVN, would make deep patrols and limited offensives, still centered on the bases, to pre-empt direct threats.

Phase III defined "Search and destroy plus reserve reaction operations." Westmoreland proposed improving the security of coastal enclaves, then, as a second phase, patrolling from those enclaves. Once the coastal areas were being patrolled, the next two phases would repeat the process inland: establish bases, then patrol from them.

Westmoreland assumed he would have III Marine Expeditionary Force, the new airmobile division, a Republic of Korea division replacing the Marines in central Vietnam, and the 173rd Airborne Brigade for the Bien Hoa/Vung Tau area near Saigon. Early, CINCPAC had objected to the use of the 173rd, since it was the primary strategic reserve for Pacific Command.

U.S. decision to escalate

Westmoreland, in early June, saw the situation as close to collapse without a major commitment of ground troops, in addition to the ARVN. This triggered several weeks of intense debate among the President's close civilian advisers, with McNamara controlling all direct military input to the process.

There were two drivers among the inner circle. First, some, but not all, were fervent believers in the containment doctrine, especially Rusk. McNamara quoted Rusk's direct appeal to Johnson:

The integrity of the U.S. commitment is the principal pillar of peace throughout the world. If that commitment becomes unreliable, the communist world woruld draw conclusions that would lead to our ruin and almost certainly to a catastrophic war. So long as the South Vietnamese are prepared to fight for themselves, we cannot abandon them without disaster to peace and to our other interests throughout the world

Second, the principals viewed the situation with their own experiential and analytical filters, well articulated by Ball in an oral history interview.

Bob

McNamara was analyzing this thing as a man who was trained in quantification, who believed in systems analysis, who believed in application of games theory to strategy, who was enormously persuaded by the disparity in military power... Rusk, it was quite a different thing. He was enormously influenced by his experience during the Korean War. Mac Bundy saw this as a fascinating set of operational problems. I think he assumed that we were so clever, somehow we could find the key hook. For myself, I had a whole different set of experiences. As a practicing lawyer, I had had among my clients various agencies of the French government when they went

through the Indo-Chinese experience. I had heard everything before.

Johnson gave the go-ahead in July, but then sent McNamara and others to study actions further.

May and June Combat

Mid-May saw a new series of Communist offensives, all over the country. Much of the action was in Phuoc Long province, 50 miles northeast of Saigon near the Cambodian boarder. Its capital, Songbe, was overrun. Song Be was primarily defended by irregular ARVN units, although supported by a Special Forces team and several miscellaneous units. An unprecedented amount of air support, including the first use of a company-sized armed helicopter unit, allowed a successful defense. Higher command, however, was concern that this large a VC unit could take an initiative.

On June 10, the VC made another two-regiment attack on Dong Xoai, north of Saigon, using one regiment against the town and Special Forces camp, while preparing an ambush for an ARVN relief force with the other. ARVN leadership disintegrated, and, contrary to policy, American advisers took command. The VC ambushes were extremely effective against ARVN relief forces, which were committed one battalion at a time, until the ARVN ran out of reserves. Among the forces destroyed was the 7th Airborne Battalion, one of the best units in the ARVN.

The 44 battalion request

Westmoreland, on June 7, sent a message to CINCPAC that a VC summer offensive was underway, not yet at its full potential, both to destroy RVN forces and isolate (but not hold) key towns. He doubted the South Vietnamee capability to cope was in grave doubt, largely due to recent troop losses. To prevent what he called collapse, he wanted to double the size of his forces, with 34 U.S. and 10 South Korean battalions comprising 175,0000 men; thus the message has been called the "44 battalion request." The State Department's Bureau of Intelligence and Research disagreed with the MACV assessment of near-collapse.

Even then, he told Lyndon Johnson, they would be a stopgap, with at least 100,000 more needed in 1966. For Johnson, it was a choice between deeper involvement or defeat. McNamara said this cable was the most disturbing of the war; it forced a major decision and discussions with the President on the 9th and 10th. In a telephone conversation afterwards, McNamara told Johnson that he personally had limitations in mind, but he did not think that the Joint Chiefs of Staff had them. Still, McNamara briefed the press on the 16th. Polls supported the escalation, and, when asked for his advice, Dwight D. Eisenhower agreed that the reinforcements should be sent.

Discussion before decision

Considerable internal discussion took place among the President's key civilian advisers, with the main four papers presented to Johnson on July 1, with a covering memo from Assistant to the President for National Security Affairs, McGeorge Bundy. George Ball was the most strongly opposed to escalation. Ball had been, since October 1964, had been sending Johnson memoranda saying "we should cut our losses."

William Bundy ruled out withdrawal, but did not think escalation would help, unless the ARVN did netter; he was concerned that too large an intervention would create a "white man's war", with the U.S. replaying the role of the French in the endgame in Indochina. Ball, in his oral history interview, deprecated William Bundy's influence, "he was not one of the top three or four people that were always talking to the President about these things.

It is clear that no military personnel were part of the inner circle of discussion, but there are different descriptions of the degree to which they were consulted. McNamara said "I spent countless hours with the Joint Chiefs" debating Westmoreland's thinking. McNamara did have a small staff group, headed by John McNaughton, who obtained technical assistance from the Joint Staff, but did not have participation from the JCS proper. McMaster, however, cites George Ball as saying that McNamara lied to the Chairman of the Joint Chiefs of Staff, Earle Wheeler, to ensure that Wheeler did not attend the meeting when the Ball and McNamara drafts were reviewed.

Congress, as an institution, also was not consulted. Johnson believed the Gulf of Tonkin resolution gave him all the authority he needed, and, indeed, Senators both opposed and supporting the escalation did not believe it was a proper matter for Congressional debate. Much later, McNamara wrote that it was wrong not to have that debate, even if it encouraged the enemy. .

Decision and worry

Before the July 1 presentation to Johnson,McGeorge Bundy suggested that he "listen hard to George Ball and then reject his proposal," and pick between McNamara's and William Bundy's recommendations; McNamara would "tone down" his recommendations.

At Defense, McNamanara agreed the situation was worse, but believed the situation might be retrieved: "The situation in SVN is worse than a year ago (when it was worse than a year before that). After a few months of stalemate, the tempo of the war has quickened. . . . The central highlands could well be lost to the NLF during this monsoon season. Since June 1, the GVN has been forced to abandon six district capitals; only one has been retaken...The odds are less than even that the Ky government will last out the year. Ky is "executive agent" for a directorate of generals."

McNamara also observed that the Administration's approach to air war against the North, Rolling Thunder, had not "produced tangible evidence of willingness on the part of Hanoi to come to the conference table in a reasonable mood. The DRV/VC seem to believe that SVN is on the run and near collapse; they show no signs of settling for less than complete takeover."

Operations continue

There was an increasing intensity to use air power in Cambodia and Laos, accelerating in July. In some, but not all cases, the Cambodian or Laotian governments were secretly consulted, but in other cases, U.S. aircraft, especially B-52 bombers acted at direct U.S. orders.

• Operation ATTLEBORO
• Battle of the Ia Drang

The year was filled with large sweep operations, including individual U.S., ARVN, and Korean forces of division and sometimes larger size, as well as use of multinational force use. VC attacks ranged in size from local bombings to multi-regimental operations, and use of longer-range artillery.

Starting on the 20th, the non-Communist forces held an 84-hour ceasefire for Tet, which was the culmination of a psychological warfare program to encourage Communist defections under the Chieu Hoi program. MACV annouced 106 Communist violations of the truce.

Starting in mid-February, patrols detected indications of a pending VC attack against the A Shau Special Forces camp, whose mission was surveillance of infiltration from the nearby Laotian border. Continuous attacks on 9-10 March overran the camp, with a disorderly retreat losing several helicopters and resulting in a number of friendly personnel missing in action.

In April, Operation ROLLING THUNDER units struck significantly closer to Hanoi and Haiphong than they ever had done, and the DRV Air Force responded with their first MiG-21 use.

1967

• Battle of Bong Son
• Operation JUNCTION CITY
• Operation CEDAR FALLS

In 1967, the NVA organization in the northwest was under two Military Regions (MR), MR-4 north and south of the DMZ, and MR-5 (also known as MR-S) for Communist units in the northern part of South Vietnam. Essentially, the MR-4 command was conventional while MR-5 was guerilla. MR-4 commanded five divisions north of the DMZ, three operational, one reserve, and one recovering from battle.

• • 1967-1968 North Vietnamese offensive

1968 began with the Tet offensive, which caused immense Communist losses. Subsequent actions in April and May were more holding actions than anything decisive; again, the goal may have been simply to pin forces while affecting American public opinion and politics. The North Vietnamese 320th Division fought the U.S. 3rd Marine Division i the area north of Dong Ha, resulting in heavy NVA casualties.

Summer

Starting in June, Marine operations made more extensive use of artillery fire support bases, a variant on typical Marine Air-Ground Task Force doctrine that tends to use air rather than substantial artillery. The 3rd would usually colocate an infantry battalion command post with the firebase, from which the infantry companies would move by foot or helicopter.

The 320th, in August, again moved against the 3rd, south of the Ben Hai River and north of Route 9, between Cam Lo and the Rockpile.