Part of the Vietnam War (1972)
The lead-up to the Battle of Kontum began in mid-1971, when North Vietnam decided that its victory in Operation Lam Son 719 indicated that the time had come for large-scale conventional offensives that could end the war quickly. The resulting offensive, planned for the spring of 1972, would be known as the Easter Offensive in the South and the Nguyen Hue Offensive in the North, Nguyen Hue being a hero of Vietnamese resistance against the Chinese in 1789. The Easter Offensive would make use of fourteen divisions and would be the largest in the war.
The 1972 Easter Offensive/Nguyen Hue Campaign began with a massive attack on the Demilitarized Zone with 30,000 People's Army of Vietnam (PAVN) soldiers and more than 100 tanks. Two thrusts of equivalent size, one towards Saigon and a third to the Central Highlands and provincial capital of Kontum began soon after. The North Vietnamese knew that if they could capture Kontum and the Central Highlands, they would cut South Vietnam in half.
The Battle for Kontum would pit the Army of the Republic of Vietnam (ARVN) 22nd and (later) the 23rd Divisions under the command of Lt. Gen. Ngô Du and later Maj. Gen. Nguyễn Văn Toàn against the equivalent of two PAVN divisions, the 320th and 2nd Divisions plus B3 Front's combat units equaled another division, the 203rd Armor Regiment, and local Viet Cong forces under the command of Lt. Gen. Hoàng Minh Thảo.
There were two factors that persuaded North Vietnam that all out assaults of this kind could be successful. First, due to President Nixon's Vietnamization policy, there were no American divisional forces in the Central Highlands, only advisers and U.S. aviation units including Air Cavalry helicopter units from the 7/17 Air Cavalry Squadron. By June of that year there were less than 50,000 U.S. forces in all of Vietnam.
Second, the North Vietnamese had persuaded the Soviets and Chinese to provide 400 PT-76, T-34-85, T-54s, and Type 59 tanks before the spring offensive.
Background.
North Vietnam had been using the Ho Chi Minh Trail along the border as a logistical artery for years. The mountainous terrain and the jungle were a shield against American air attack.
The ARVN bases at Tân Cảnh and Đắk Tô, were protected by the 42nd Regiment of the 22nd Division. The 22nd also controlled five fire support bases (FSBs) that stretched south-west from Tan Canh towards Kontum along a backbone of mountains nicknamed Rocket Ridge.
John Paul Vann, the civilian "general" of II Corps, had received intelligence that a major battle was coming. Du responded by gathering the 23rd Division into the Tan Canh/Kontum area. Vann also ordered increased B-52 air attacks that February and March.
Attacks on the Fire Support Bases.
On 4 April 1972, the PAVN launched an early morning attack against Firebase Delta. Instead of the usual artillery fire from the jungle, elements of the PAVN 320th Infantry Division made a massed attack supported by artillery and rockets. For several days the PAVN hit FSB Delta and the other fire support bases along Rocket Ridge. Helicopters from the 52nd Combat Aviation operating out of Camp Holloway in Pleiku, were dispatched to provide support. The firebases were totally dependent on helicopter support for supplies and ammunition and in spite of the heavy anti-aircraft fire, the helicopters went on the offensive to provide fire support to the FSBs. At one point, the northern part of Delta was overrun by elements of the 320th Division. Vann, already in the area for an air rescue, was able to direct attacks on the PAVN soldiers entering the base with Cobra gunships. The PAVN attack was stopped in its tracks.
On 14 April, following a rocket and artillery barrage, the 320th Division attacked Firebase Charlie () on the northern end of Rocket Ridge and 10 km from Dak To. Despite airstrikes and helicopter gunship support the ARVN Airborne defenders were forced to abandon the base that night. Major John J. Duffy, the advisor to the 11th Airborne Battalion, would be awarded the Medal of Honor for his actions in 2022. The attacks on the firebases continued as April wore on. Finally on 21 April, FSB Delta was taken by the PAVN. Several of the other bases had to be given up soon after with heavy casualties.
Loss of Tân Cảnh and Đắk Tô.
In early 1972 the ARVN 42nd Regiment of the 22nd Division was stationed at Tân Cảnh.
On 7/8 February following intelligence showing a PAVN buildup in the area the 22nd Division forward command post, 47th Regiment and supporting units were moved from Ba Gi to the Đắk Tô/Tân Cảnh area. Elements of the 19th Cavalry Regiment were attached to the Division to support its organic 14th Cavalry Regiment equipped with M41 light tanks. The armored units would be deployed forward at Ben Het Camp which was regarded as the most likely direction of a PAVN armored attack.
Since the start of the Easter Offensive at the end of March, the base areas had come under increasing PAVN artillery and rocket fire, which had gone from 20 to 50 rounds per day in March to up to 1000 per day by mid-April. During early April, the 47th Regiment withdrew to Đắk Tô II, while the 42nd Regiment and one Battalion of the 41st Regiment were at Tân Cảnh supported by armor and artillery. In addition ARVN Airborne and Rangers occupied a string of firebases along Rocket Ridge. On 23 April, the PAVN 2nd Division started their attack on Tân Cảnh by hitting the ARVN tanks with AT-3 missiles and this was followed by a direct hit on the 42nd Regiment command bunker injuring the senior U.S. Adviser and several of the ARVN commanders and severely undermining the confidence of Colonel Lê Đức Đạt the 22nd Division commander. By midday all five of the M41 tanks in the base and several more bunkers had been destroyed by the missiles. At 11:00 Vann landed to assess the situation and instructed the U.S. advisers to prepare to escape and evade from the camp. At 19:00 PAVN rocket fire ignited the base ammunition dump
At 21:00 a column of 18 PAVN tanks was spotted in the area, an Air Force AC-130 gunship arrived at 23:00 and began to engage the T-54 tanks with its 105mm cannon. Three T-54s were disabled but later recovered by the PAVN. At midnight the tank column turned towards Tân Cảnh and the ARVN artillery began firing on the column until stopped by PAVN counterbattery fire. Two bridges on the approach to Tân Cảnh were abandoned without being destroyed. The ARVN organised hunter-killer teams and these destroyed two tanks.
Just before 06:00 on 24 April, the PAVN tanks attacked Tân Cảnh in two columns. One column of T-54s attacked the main gate, the other moving to secure the airstrip. The advance of the tanks caused the 900 support troops to panic. The new command bunker was hit by further artillery fire destroying the radio antennas. With the collapse of all command and control on the base, the American advisers abandoned the command bunker and moved to a new position to call in airstrikes, however fog made such airstrikes impossible. At dawn Vann arrived over Tân Cảnh in his OH-58A and made contact with the advisers who had escaped from the base perimeter. Vann landed and six advisers squeezed into the helicopter while frightened ARVN troops hung onto the skids. The helicopter flew to Đắk Tô II to drop off the passengers and then flew back to Tân Cảnh where they picked up the remaining three advisers, however the helicopter was swarmed by panicky ARVN and crashed on takeoff. Another helicopter came in and picked up Vann, his pilot and the three advisers and flew them to Pleiku.
One hour after the main PAVN attack on Tân Cảnh commenced, the PAVN began their attack on Đắk Tô II. A UH-1H helicopter #69-15715 landed to evacuate the six U.S. advisers who had been rescued from the Tân Cảnh perimeter, this helicopter was hit by PAVN anti-aircraft fire and crashed, five passengers and crew were killed in the crash while five survived, evaded capture and were recovered up 13 days later. The PAVN penetrated the base perimeter suffering heavy losses, the remaining U.S. advisers called in airstrikes as the morning fog cleared but by 10:00 the 47th Regiment commander had lost contact with most of his subordinates and the command group evacuated the command bunker for a bunker in the inner perimeter. A T-54 moved into the base and began direct fire on the command post, the two remaining M41s engaged the T-54, however their 76mm guns had no apparent effect on the T-54 which quickly knocked out both M41s. A relief column of M-41s supported by infantry arrived from Ben Het around this time, but all the M41s were knocked out by B-40 rockets and recoilless rifle fire and the infantry dispersed. With the failure of this counterattack and the loss of command and control the ARVN forces began to evacuate the base towards the south. As the ARVN attempted to cross the Dak Poko river they came under intense PAVN fire and the senior U.S. adviser Lieutenant colonel Robert Brownlee disappeared during this engagement. At 20:00 the 47th Regiment command group attempted to escape the base and by 04:30 on 25 April after losing several men to PAVN fire escaped the base perimeter and were recovered the following day.
On 25 April the PAVN mopped up the remaining ARVN positions around Tân Cảnh/Đắk Tô. The 22nd Division had ceased to exist as a fighting unit, the Division commander Colonel Đạt and his entire staff had disappeared and the PAVN had captured 23 105mm and seven 155mm howitzers and large supplies of ammunition and stores. With the loss of the main camps, the remaining firebases along Rocket Ridge were abandoned and the PAVN had a clear approach to Kontum. On 25 April, the Joint General Staff(JGS) took the 2nd airborne brigade out of Vo Dinh, once the 6th Ranger Group arrived to fill the gap a day before. 
Prelude.
With the loss of Tan Canh, little stood between the PAVN and Kontum. Whether because of logistical issues or lack of leadership, the PAVN did not pursue their advantage. Instead of refilling their tanks and traveling to Kontum, the PAVN waited for almost three weeks. In preparing for the final push to take the Kontum city, the PAVN gradually moved forces southeast toward Vo Dinh base in the north and Chu Pao pass in the south of the city.
Meanwhile, the 3rd PAVN Division attacked the three northernmost districts of Bình Định province, forcing the remaining two regiments of the 22nd ARVN Division to flee from their two major bases Landing Zone English and Bong Son, and other strong points in the area. This event made the JGS began to trust Vann's contention that the PAVN's real goal was to take Kontum and Bình Định, not An Lộc nor Quảng Trị, to cut South Vietnam in two. On April 28, Du was ordered to Saigon to see President Thiệu, then finally replaced by Major general Toàn on May 10. II Corps began its new defensive plan against the PAVN advance, by assigning Colonel Lý Tòng Bá, commander of the 23rd Division, to command all forces in Kontum province, including his division's 53rd Regiment, 2nd and 6th Ranger Groups, and Kontum sector forces. On April 28, the 23rd Division HQ was also moved over 150 kilometers from Ban Me Thuot to Kontum city.
After two days of heavy attacks-by-fire, the 6th Ranger Group's command post and U.S. advisors were airlifted to FSB November on 27 April. Two days later, the 6th Group's remaining two battalions also fled from Lam Son base, forced their accompanying armor and artillery units consequently fled. On 1 May, Vo Dinh was completely abandoned. 
On the ground in Kontum, Colonel John Truby, the acting Senior Advisor for the 23rd (awaiting the arrival of Colonel Rhotenberry), had the task of tactical coordination of defense. Outlying units were brought into the city. A perimeter defense of the city and proper defence was implemented. The ARVN soldiers, believing that the T-54 tanks were unstoppable, were trained on how to attack them using M72 LAW missiles.
In early May the PAVN turned their attention to the Polei Kleng