The First Battle of Naktong Bulge was an engagement between United Nations Command (UN) and North Korean forces early in the Korean War from August 5–19, 1950 in the vicinity of Yongsan (Yeongsan, Changnyeong county) and the Naktong River in South Korea. It was a part of the Battle of Pusan Perimeter, and was one of several large engagements fought simultaneously. The battle ended in a victory for the UN after large numbers of US reinforcements destroyed an attacking North Korean division.
On August 5, the Korean People's Army (KPA), 4th Infantry Division crossed the Naktong River in the vicinity of Yongsan, attempting to cut UN supply lines to the north as well as gaining a bridgehead into the Pusan Perimeter. Opposing it was the 24th Infantry Division of the Eighth United States Army. Over the next two weeks, US and KPA forces fought a bloody series of engagements inflicting heavy casualties on one another in a confusing series of attacks and counterattacks, but neither side was able to gain the upper hand. In the end, the US forces, aided by reinforcements, air support and heavy weapons, destroyed the KPA force which was hampered by lack of supply and high desertion rates.
The battle was a turning point in the war for the KPA, which had seen previous victories owing to superior numbers and equipment. UN forces now had a numerical superiority and more equipment, including M4 Sherman tanks and heavy weapons capable of defeating the KPA T-34 tanks.
Background
Outbreak of war
Following the 25 June 1950 outbreak of the Korean War after the invasion of South Korea by North Korea, the United Nations decided to commit troops to the conflict on behalf of South Korea. The United States subsequently committed ground forces to the Korean Peninsula with the goal of fighting back the North Korean invasion and to prevent South Korea from collapsing. However, US forces in the Far East had been steadily decreasing since the end of World War II, five years earlier, and at the time the closest forces were the 24th Infantry Division, headquartered in Japan. The division was understrength, and most of its equipment was antiquated due to reductions in military spending. Regardless, the 24th was ordered to South Korea.
The 24th Infantry Division was the first US unit sent into Korea with the mission to take the initial "shock" of KPA advances, delaying much larger KPA units to buy time to allow reinforcements to arrive. The division was consequently alone for several weeks as it attempted to delay the KPA, making time for the 1st Cavalry and the 7th and 25th Infantry Divisions, along with other Eighth Army supporting units, to move into position. Advance elements of the 24th Division were badly defeated in the Battle of Osan on July 5, the first encounter between US and KPA forces. For the first month after the defeat of Task Force Smith, 24th Division was repeatedly defeated and forced south by superior KPA numbers and equipment. The regiments of the 24th Division were systematically pushed south in engagements around Chochiwon, Chonan, and Pyongtaek. The 24th made a final stand in the Battle of Taejon, where it was almost completely destroyed but delaying KPA forces until July 20. By that time, the Eighth Army's force of combat troops were roughly equal to KPA forces attacking the region, with new UN units arriving every day.
North Korean advance
With Taejon captured, KPA forces began surrounding the Pusan Perimeter from all sides in an attempt to envelop it. The KPA 4th and 6th Divisions advanced south in a wide flanking maneuver. The two divisions attempted to envelop the UN's left flank, but became extremely spread out in the process. They advanced on UN positions with armor and superior numbers, repeatedly pushing back UN forces.
UN forces were pushed back repeatedly before finally halting the KPA advance in a series of engagements in the southern section of the country. Forces of the 3rd Battalion, 29th Infantry Regiment, newly arrived in the country, were wiped out at Hadong in a coordinated ambush by KPA forces on July 27, opening a pass to the Pusan area. Soon after, KPA forces took Chinju to the west, pushing back the US 19th Infantry Regiment and leaving routes to the Pusan open for more KPA attacks. US formations were subsequently able to defeat and push back the KPA on the flank in the Battle of the Notch on August 2. Suffering mounting losses, the KPA force in the west withdrew for several days to re-equip and receive reinforcements. This granted both sides a reprieve to prepare for the attack on the Pusan Perimeter.
Naktong Bulge
About 7 miles (11 km) north of the point where it turns east and is joined by the Nam River, the Naktong River curves westward opposite Yongsan in a wide semicircular loop. For most of this span, the Naktong is around 400 metres (1,300 ft) wide and 6 feet (1.8 m) deep, allowing infantry to wade across with some difficulty but preventing vehicles from crossing without assistance. This perimeter was defended by a network of observation posts on the high ground, manned by 24th Infantry. Forces in reserve would counterattack any attempted crossings by KPA. Artillery and mortar fire units were also deployed so large amounts of fire could be delivered on any one spot. The division was extremely dispersed, already understrength, it presented a very thin line.
Battle
The 24th US Infantry Division, under the command of Major general John H. Church, occupied a region some 16 miles (26 km) long along the Naktong River. The 34th Infantry Regiment occupied the southern half, west of Yongsan while the 21st Infantry Regiment occupied the northern half, west of Changyong. The 19th Infantry Regiment, meanwhile, was re-equipping in the rear of the lines. In all, the 24th and its supporting units had a strength of 14,540 on August 5.
Opposing the 24th Infantry was the KPA 4th Division, under the command of Major general Lee Kwon Mu. Both Mu and his division were highly decorated for their exploits so far in the war, particularly during the First Battle of Seoul. By August 4 the 4th Division had concentrated all of its regiments in the vicinity of Hyopch'on. It stood at a strength of about 7,000 with 1,500 in each infantry regiment.
North Korean attack
At midnight on the night of August 5–6, 800 KPA soldiers of the 3rd Battalion, 16th Regiment waded across the river at the Ohang ferry site, (35°28′26″N 128°25′16″E / 35.474°N 128.421°E) 3.5 miles (5.6 km) south of Pugong-ni and west of Yongsan, carrying light weapons and supplies over their heads or on rafts. A second force attempted to cross further north but was hit with machine gun and artillery fire, falling back in confusion. At 02:00 on August 6, the KPA began engaging the forces of 3rd Battalion, 34th Infantry and moved forward after a small fight, attempting to penetrate the lines to Yongsan. KPA infantry forced 3rd Battalion back, and they abandoned their command post to consolidate their position. The attack caught the Americans by surprise as US commanders expected the KPA to attempt a crossing further north. The landing threatened to split the US lines and disrupt supply lines to positions further north. Subsequently, the KPA were able to capture a large amount of US equipment.
US counterattack
The 34th Infantry's regimental headquarters ordered the 1st Battalion to counterattack the KPA. When 1st Battalion arrived at 3rd Battalion's former command post, it was ambushed by KPA troops on the high ground. C Company, the first to arrive, suffered over fifty percent casualties. A and B Companies counterattacked with tanks and armor, eventually rescuing the beleaguered C Company. At around 20:00, A Company made contact with L Company, 3rd Battalion, still in its positions on the river, radioing that the KPA had penetrated eastward north of the Yongsan-Naktong River road to Cloverleaf Hill (35°27′00″N 128°26′10″E / 35.45°N 128.436°E), but had not yet crossed south of the road to Obong-ni Ridge (35°26′06″N 128°26′38″E / 35.435°N 128.444°E). The KPA had penetrated 3 miles (4.8 km) east of the Naktong and halfway to Yongsan.
Several units of the 34th Regiment began to retreat north and into the 21st Infantry's lines, but Church ordered them turned around. He also ordered the 19th Infantry to counterattack west along the northern flank of the 34th Infantry to help oppose the KPA. Although the 24th Infantry was repulsed closer to the river, 1 mile (1.6 km) inland the 19th Infantry trapped about 300 KPA in a village and killed most of them.
The 1st Battalion, 34th Infantry, had managed to block the KPA advance to Yongsan while the 19th Infantry was able to push it back and inflict substantial casualties. However, by the evening of August 6, the KPA held firmly on to their bridgehead. Attempted crossings that night were repulsed to the south by Republic of Korea Army (ROKA) forces, but an unknown number of reinforcements were moved across the river the night of August 6–7. On August 7–8, the KPA tried to move two more battalions across the river to the north, but were repulsed by 21st Infantry, which was still in place. The KPA battalions were shifted south to cross at the bridgehead, instead. By August 8, an estimated KPA regiment were across the Naktong.
Counterattacks
American counterattacks continued into the morning of August 7, but the gains were slow, hampered by the hot weather and a lack of food and water. The KPA were able to press forward and regain the Cloverleaf Hill and Obong-ni Ridge, critical terrain astride the main road in the bulge area. By 16:00 that day, the 9th Infantry Regiment, 2nd Infantry Division, a unit newly arrived in Korea, was sent to the region. Church immediately ordered it to attack the KPA salient at the bulge. 9th Infantry was fresh and well-equipped. They were also inexperienced, many of their number being reservists. Despite a tenacious attack, the 9th Infantry was only able to regain part of Cloverleaf Hill before intense fighting stalled its movement.
KPA forces began making gains in the hills along the river adjacent to their bridgehead, against positions of the 34th Infantry. Coordinated attacks pushed A Company to the north back from their hills with heavy casualties on August 7. K Company to the south was also attacked but held its line, reinforced by L Company on August 10. Fighting continued for several days, resulting in heavy casualties as both sides captured and recaptured the hills along the Naktong, neither side able to gain a decisive advantage against the other.
Task Force Hill
In an attempt to destroy the KPA bridgehead, Church assembled a large force under the 9th Infantry Regiment. Dubbed Task Force Hill, this force comprised the 9th, 19th and 34th Infantry Regiments as well as 1st Battalion, 21st Infantry, plus supporting artillery and other attached units. It was assigned to drive the KPA from the east bank of the river on August 11. Commanding the task force was Colonel John G. Hill, the commanding officer of the 9th Infantry Regiment.
The KPA 4th Division, meanwhile, had constructed underwater bridges of sandbags, logs, and rocks, finishing the first on August 10. 4th Division used it to move trucks and heavy artillery as well as additional infantry and a few tanks across the river. By the morning of August 10, an estimated two KPA regiments were across the river and occupying fortified positions. Supplies continued to stream in through rafts. Task Force Hill mounted its attack, but was once again unable to make progress due to the newly established artillery. Its directive to attack quickly became one to dig in and hold its ground, and by nightfall the entire KPA 4th Division was across the river. On August 10, elements of the KPA 4th Division began to move south, outflanking Task Force Hill. The next day, scattered KPA elements attacked Yongsan. The KPA repeatedly attacked at night, when American soldiers were resting and had greater difficulty resisting.
Reinforcements
On August 12, General Walton Walker, in command of the Eighth Army, dispatched part of the 27th Infantry Regiment, 25th Infantry Division, to attack north from the 25th Division's zone to drive off KPA 4th Division troops moving into Yongsan. Simultaneously, Church assembled all the combat service support soldiers he could and formed them into a combat unit to block further penetration of KPA forces, which were setting up roadblocks on the roads from Yongsan.