North Korean forces crossed the Kum River and captured Taejon, an important communications center, on 20 July, U.S. and ROK troops continued to withdraw steadily to the southeast under constant North Korean pressure. During the withdrawal our Army's 3.5-inch rocket launcher was used (for the first time on a battlefield) with highly successful results against North Korean tanks. It was in this period that the 24th Division commander, Maj. Gen. William F. Dean, was reported missing when North Korean tanks broke through the forward units of his division. It was learned later that he had been captured about 35 miles south of Taejon on 25 August.

The final days of July 1950 witnessed a series of hard-fought battles all along the 200-mile front of the United Nations perimeter. The northern front, a line running inland from Yongdok through Andong, Yech'on, Hamch'ong, and Hwanggan to Kumch'on, was defended at critical points by ROK troops and the U.S. 25th Division. The 1st Cavalry Division was battling on the west flank to keep the Yongdong-Kumch'on-Taegu rail line open. To block the southwestern approaches to Pusan, which the enemy was threatening, the 29th RCT advanced to Chinju, but was ambushed by a North Korean division and suffered heavy losses. Enemy pressure continued relentlessly. By the end of July the North Koreans held a line which ran from Yosu and Chinju in the southwest to Kwan-ni on the Taejon-Taegu railroad, thence northeast through Yech'on to Yongdok on the Sea of Japan.

Pusan Perimeter. By the beginning of August the U.S. and ROK forces had withdrawn behind the Naktong River, a position which the U.N. Command was determined to hold. The area held in southeastern Korea resembled a rectangle, the southwestern side of which was guarded by the 24th and 25th Divisions to prevent a breakthrough to Masan. The 1st Cavalry Division was deployed on the western front to guard the Taegu railroad approaches. The northern front was defended by ROK divisions from a point south of Hamch'ang to a point just south of Yongdok on the east coast.

Early in August General Walker de

clared the strategy of trading space for time to be at an end, and ordered a final stand along this 140-mile perimeter around the port of Pusan, which had become a well-stocked Eighth Army supply base and the hub of a rail and road net leading to the battle front. By now the enemy's lengthened supply lines were under constant air attack, enemy naval opposition had been wiped out, and the blockade of the Korean coast had been clamped tight.

During the next month and a half, fourteen North Korean divisions dissipated their strength in piecemeal attacks against the Pusan perimeter. Walker, by rapidly shuttling his forces to meet the greatest threats, inflicted heavy casualties on the North Koreans and prevented serious penetrations. The enemy, determined to annihilate the Eighth Army and take Taegu and Pusan, massed for a two-pronged attack across the Naktong, one prong from the west and the other from the southwest. The principal actions were fought along the river from Waegwan south through Song-dong and Ch'irhyon-ni to the junction of the Naktong and Nam Rivers, and southwest toward Haman and Chinju.

While U.S. troops were fighting along the banks of the Naktong, other battles took place in the southwest. A veteran North Korean division, which had been concentrated for an assault upon Masan and Pusan, was hit by Task Force Kean. Named for the 25th Division Commander, the Task Force was composed of the 5th RCT, the 35th RCT of the 25th Division, the 1st Marine Brigade, and a ROK battalion. It opened a strong counteroffensive on 7 August 1950 to secure the left flank of the perimeter and prevent the enemy from driving on Pusan. Overcoming initial heavy resistance, it defeated the North Koreans and by 11 August commanded the high ground to the east of Chinju.

On the eastern flank of the perimeter the town of Yongdok was lost by ROK units, some of which then had to be evacuated by sea. On 12 August the port of P'chang-dong was attacked by enemy forces led by tanks which mounted screaming sirens. This force poured through a break in the ROK lines and linked up with North Kor

ean advance agents in the port. These agents, disguised as innocent-looking refugees, carried mortars, machineguns, and other weapons in oxcarts, on Aframes, and on their persons. While a force of North Koreans took P'changdong, the adjoining airstrip, of great importance to the U.N. forces as a base for tactical aircraft, was also in danger of being captured. On 13 August the danger was so pressing that all aircraft were evacuated. Within the next five days, however, ROK troops and a small U.S. task force recaptured P'chang-dong and returned it to U.N. control.

During this time a much larger force of North Koreans breached the U.N. positions at some points in the Naktong River sector, but failed in their attempt to capture the rail junctions at Taegu. To hold a line near the river, Walker rearranged the defensive positions of the 24th and 25th Infantry Divisions, the 1st Cavalry Division, and the 1st Marine Brigade, deploying them in a manner which assigned combat zones of 15-30 miles to each division.

The enemy, continuing his efforts to crack the perimeter, massed several divisions above Waegwan to assault Taegu from the north. Despite a bombing raid in which U.N. air forces dropped 850 tons of bombs on the suspected enemy concentration area, the North Koreans launched a powerful attack which carried through the ROK positions and threatened Taegu. Stalwart defense and swift countermeasures in this area on 19 August saved Taegu from almost certain capture, parried the enemy's threepronged thrust at the city, and stopped the momentum of the North Korean offensive.

Shortly before midnight on 31 August enemy forces again attacked the Naktong River Line, this time in tremendous force. Disregarding very heavy casualties from U.N. air force bombing and strafing, they mounted a strong offensive against the entire Pusan beachhead from Haman in the south to P'chang-dong in the northern sector. The port of P'chang-dong was captured on 6 September, but again the Communists failed to capture the airfield. Waegwan and the "walled city" of Kasan were lost as the U.N. defenders fell back for a last ditch stand at Taegu.

Between 4 and 11 September the enemy made important gains along the Naktong in some of the heaviest fighting of the war; but U. N. forces blunted the drive on Taegu and began to show slow progress of their own against very strong enemy resistance.

On the southern front the North Korean offensive, which opened with a massive artillery barrage near Haman, struck the 25th Division with tanks and waves of infantry, imperiling its forward positions. However, although the enemy had made impressive gains along the U.N. perimeter and General Walker still had to shuttle his units from one critical area to another, a strong beachhead remained in the hands of the U.N. Command.

By mid-August the offensive capability of the Eighth Army had been augmented by the arrival of the U.S. 2d Division, the 1st Marine Brigade, four battalions of medium tanks from the United States, and the 5th RCT from Hawaii. Before the month was out, five ROK divisions were restored to some semblance of order, and Great Britain committed the 27th Brigade from Hong Kong. With the arrival of these reinforcements an attempt could now be made to end the U.N. withdrawal and to begin a U.N. offensive in southeastern Korea.

MacArthur's Plan. The plan of the U.N. commander for a decisive blow to turn the tide of battle is best understood in terms of Korea's terrain. Ranges of mountains run the length of the east coast and spur ranges extend southwesterly across most of the peninsula. The peaks and ridges of these ranges, which are numerous and unusually steep, limited the mobility of the highly motorized and mechanized U.S. forces. Roads are few and primitive, and the principal highways and rail lines follow the path of least resistance. Korea's primary communications system is therefore centered in the lowlands of the west, and converges on Seoul, its hub. Seoul was thus the key communications center for the North Korean forces operating in southern Korea.

As the capital city, its recapture was psychologically important. MacArthur therefore planned an amphibious land

ing at Inch'on, a port of the Yellow Sea 25 miles west of Seoul, to be followed by an advance to recapture the city and block North Korean troop movements and supply routes there. Concurrently the Eighth Army was to break out of the Pusan Perimeter and move northward, driving the North Koreans into the Inch'on landing forces which would be driving south. Maj. Gen. Edward M. Almond, commander of the newly activated X Corps, was to be in command of the invasion troops.

Inch'on Landing; Breakout From Pusan Perimeter. Early on 15 September a Marine battalion of the 1st Marine Division (which had loaded in Japan for the Inch'on Landing), covered by strong air strikes and naval gunfire, quickly captured Wolmi Island, just offshore from Inch'on. By afternoon, Marine assault waves rode the high tide into the port itself (UN Offensive 16 September to 2 November 1950). The remainder of the 1st Marine Division disembarked and pressed toward Kimpo Airfield, the Han River, and Seoul. The 7th Infantry Division came ashore; some elements turned southeastward toward Suwon, south of Seoul, while the remainder of the division joined the Marines in the advance toward Seoul. Kimpo Airfield was captured by the 18th, and put in use by the cargo-carrying planes of the Far East Air Forces to augment the stream of supplies being landed by the Navy at Inch'on. The 187th RCT was flown into Kimpo Airfield to strengthen U.N. defenses in that area. After heavy fighting between advancing U.N. forces and the determined North Korean forces, which had resolved to fight for Seoul street by street, MacArthur announced on 26 September that the city was again in friendly hands; but fighting continued there for several days. On 29 September MacArthur returned Seoul to President Rhee in a ceremony held in the blackened capitol building. The Eight Army began its offensive northward on 16 September. The ROK I and II Corps were in position on the north side of the perimeter. The U.S. I Corps, composed to the 1st Cavalry Division, the 27th British Commonwealth Brigade, the 24th Division, and the 1st ROK Division, was on the

Taegu front. The remainder of the Eighth Army, positioned along the Naktong, included the U.S. 2nd and 25th Divisions and attached ROK units. Progress was limited at first, but as the portent of the converging attacks became clear to the North Koreans, they fled north with heavy losses in men and materiel. Elements of the 7th Division (X Corps) and the 1st Cavalry Division (Eighth Army) made contact late on 26 September just south of Suwon, thus effecting a juncture of U.N. forces. Organized enemy resistance continued in the Eighth Army sector until the last days of September. Although large numbers of enemy troops escaped through the eastern mountains, more than 100,000 prisoners were captured during this period; by 30 September the North Korean Army had ceased to exist as an organized force below the 38th parallel. However, remnants of the army, fighting as guerrillas, continued to pose a considerable threat to the security of the U.N. forces.

During the latter part of September the Eighth Army was reinforced by a battalion each of Philippine and Australian troops. Early in October the U.S. 3d Division arrived in the Far East.

U.N. Forces Enter North Korea. On 27 September 1950 the Joint Chiefs of Staff authorized MacArthur to conduct military operations north of the 38th parallel to destroy the North Korean armed forces, but stipulated that he submit his plan for such operations for their approval. On the 29th President Truman approved a directive freeing MacArthur from this restriction.

On 1 October, the first anniversary of the Chinese Communist state, Premier Chou En-lai warned that the Chinese people "will not tolerate foreign aggression and will not stand aside should the imperialists wantonly invade the territory of their neighbor." A week later (7 October) the U.N. General Assembly gave implicit consent to the movement of U.N. forces across the 38th parallel, recommending that "all appropriate steps be taken to ensure conditions of stability throughout Korea." It also recommended the establishment of a unified, independent, and democratic government in the sovereign state of Korea.

While these actions were taking place in the U.N., MacArthur addressed a demand to the Commander in Chief of the North Korean forces to surrender and liberate U.N. prisoners of war and civilian internees. This demand, and MacArthur's second ultimatum of 9 October, were both ignored.

Meantime Walker's ROK I Corps crossed the 38th parallel on 1 October 1950 and advanced up the east coast, capturing Wonsan, North Korea's major seaport, on 10 October. The ROK II Corps also crossed the parallel and advanced northward through central Korea. In the west, Walker's remaining forces relieved the X Corps in the Seoul area and crossed the parallel on 9 October toward P'yongyang. By mid-October the U.N. forces had penetrated about 20 miles into North Korean territory.

In the second half of October 1950 the advance quickened as enemy resistance weakened and thousands of enemy troops surrendered. U.N. objectives were the destruction of the remaining Communist divisions and the capture of important North Korean cities. ROK troops spread through central and east Korea. Some turned north toward the industrial area centering around Hamhung and Hungnam, others west along the Wonsan-P'yongyang road. In the west the 1st Cavalry Division, after fighting through pill box defenses at Kumch'on, a few miles north of the parallel, progressed up the SeoulP'yongyang railroad. The 24th Division drove to the south bank of the Taedong River in the vicinity of Chinnamp'o, the port for P'yongyang. The 1st Cavalry and 1st ROK Divisions entered P'yongyang on 19 October and secured the city in the next forty-eight hours. On 20 October the 187th Airborne RCT, complete with vehicles and howitzers, dropped on Sukch'on and Sunch'on. about 30 miles above the city of P'yongyang, to trap North Koreans fleeing northward. In northwest Korea a ROK regiment, leading the advance of the Eighth Army, entered the town of Ch'osan on 26 October, thereby becoming the first U.N. element to reach the Yalu River. Farther south additional U.N. forces crossed the Ch'ongch'on River at Sinanju and pushed toward the

Manchurian border. For all practical purposes the North Korean Army had dissolved by the last week in October, and had melted away in the mountains adjacent to Manchuria and the Soviet Union.

Meanwhile Almond's X Corps had been withdrawn from combat and prepared for amphibious landings on the east coast of Korea. Since the rapid advance of ROK ground units and the fall of Wonsan made a combat landing there unnecessary, the 1st Marine Division carried out an administrative landing at Wonsan on 26 October, despite the heavily mined harbor which caused a long delay in unloading. On 29 October the 7th Division landed unopposed at Iwon, 80 miles farther north.

General Almond, adding the ROK I Corps to his command, set out to capture the industrial and communications areas, the port installations, and the power and irrigation plants of northeastern Korea. The ROK I Corps moved up the coastline toward Ch'ongjin, 120 miles north of Iwon. The 1st Marine Division moved 50 miles north of Hamhung and its port of Hungnam, then turned inland toward the Changjin (Chosin) Reservoir, 45 miles to the northwest. Elements of the 7th Division attacked northwestward toward the Pujon Reservoir and the Yalu River.

THE PERIOD 3 NOVEMBER 195022 JUNE 1951. On the face of it, the course of the war in October 1950 was highly favorable. But the appearance of Chinese Communist troops in the field warned of a new threat to U.N. victory.

Chinese Intervention. On 1 November Chinese elements were identified south of the Changjin Reservoir, and within ten days twelve divisions of the Chinese Communist Forces were identified (CCF Intervention-3 November 1950 to 24 January 1951). In the northwest, strong enemy attacks against the Eighth Army smashed the ROK divisions. Very hard fighting took place near Ch'osan, Unsan, and Tokch'on. While the 24th Division pulled back to Chongju on the west coast, the 1st Cavalry and 2d Divisions fought along the Ch'ongch'on River. In the air over Korea, U.N. pilots were opposed for the first time by speedy Russian MIG-15 jet fighters.

By 10 November, as the Chinese attacks were abating, the Eighth Army and the X Corps conducted only smallscale operations, and a comparative lull hung over much of the front. By 21 November elements of the U.S. 7th Division occupied Hyesanjin on the Yalu River in northeastern Korea, the most northerly point to be reached by U.S. forces during the war. The ROK Capital Division meanwhile progressed rapidly up the east coast to the NamanSo-dong area. By 24 November the U.N. positions extended from So-dong in the northeast to Hyesanjin on the Yalu, and thence in a southwesterly direction through the areas around Sang-ni, Handae, Yudam-ni, Yongwen, Ipsok, Pakch'on and south of Chongju to the Yellow Sea.

Previous to the entry of Chinese forces in North Korea, MacArthur had ordered the Eighth Army and the X Corps on 24 October to attack toward the Manchurian border and restore peace in Korea before the onset of winter. The difficulty of securing adequate logistical support delayed the attack. In the latter part of the month, brief clashes with Chinese troops posed a new threat. The purpose and extent of the Chinese intervention was not yet clear; but in the face of this new opposition, Walker had withdrawn his extended forces back to the lower bank of the Ch'onch'on River, leaving only a small bridgehead above Sinanju.

The fact of Chinese participation in the conflict caused MacArthur to reconsider his plans for an all-out attack to the Yalu River, but not to abandon them. Walker's forces were to move northward through western and central Korea, while Almond's troops were to attack to the northwest to cut the enemy line of communications and give maximum assistance to the Eighth Army. On 24 November the Eighth Army, with the ROK II Corps, launched its planned offensive. For the first twenty-four hours little enemy opposition was encountered, but on the next day enemy troops initiated a violent counterattack against the Eighth Army in the mountainous territory surrounding the central North Korean town of Tokch'on. The X Corps began its attack early on 27 November, and had made

slight advances before evening, when a second enemy force, moving down both sides of the Changjin Reservoir, struck at the 1st Marine Division and elements of the U.S. 7th Division.

It was quickly apparent that the bulk of the enemy forces were organized Chinese Communist units. It was now evident to the UN Command that the Chinese had amassed two large armies in northern Korea, by marching them from Manchuria under cover of darkness and expertly camouflaging them during the day. They were comparatively safe from detection by UN air observers in the rugged mountain terrain, and UN aircraft were prohibited from making reconnaissance flights across the frontier. Thus the strength of the attacking Chinese forces came as a surprise to most of the U.N. Command.

The main enemy effort was directed against the ROK II Corps, which collapsed under the weight of the Chinese assault. As the Communists strove to extend their breakthrough of the U.N. line, Walker rushed his reserve units (the 1st Cavalry Division, the Turkish Brigade, and the British 27th Commonwealth and 29th Independent Infantry Brigades) to the area, but failed to stem the Communist advance. Assaulted by wave after wave of enemy troops, the Eighth Army front withdrew south across the Ch'ongch'on River. These forces, fighting hand to hand with the enemy along the river banks and retreating over roads choked with troops, refugees, trucks, and tanks, suffered heavy losses. The U.S. 2d Division was assigned to fight a delaying action until other units could retire and regroup in defensive positions near P'yongyang. On 5 December the Eighth Army fell back from P'yongyang to positions about 25 miles south of the city. By the middle of December it had withdrawn below the 38th parallel and formed a defensive perimeter north and east of Seoul.

Evacuation of X Corps. On 27 November 1950 the Chinese began their offensive against the X Corps, attacking the Marine and 7th Division elements in the Changjin Reservoir area with six divisions. Since the most northerly