U.S. Eighth Army
Encyclopedia
The Eighth United States Army – often unofficially abbreviated EUSA – is the commanding formation of all US Army
United States Army
The United States Army is the main branch of the United States Armed Forces responsible for land-based military operations. It is the largest and oldest established branch of the U.S. military, and is one of seven U.S. uniformed services...

 troops in South Korea
South Korea
The Republic of Korea , , is a sovereign state in East Asia, located on the southern portion of the Korean Peninsula. It is neighbored by the People's Republic of China to the west, Japan to the east, North Korea to the north, and the East China Sea and Republic of China to the south...

.

World War II

The unit first activated on 10 June 1944 in the United States, being commanded by Lieutenant General Robert Eichelberger. The Eighth Army took part in many of the amphibious landings in the Southwest Pacific Theater of World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, eventually participating in no less than sixty of them. The first mission of the Eighth Army, in September 1944, was to take over from the US Sixth Army in New Guinea
New Guinea
New Guinea is the world's second largest island, after Greenland, covering a land area of 786,000 km2. Located in the southwest Pacific Ocean, it lies geographically to the east of the Malay Archipelago, with which it is sometimes included as part of a greater Indo-Australian Archipelago...

, New Britain
New Britain
New Britain, or Niu Briten, is the largest island in the Bismarck Archipelago of Papua New Guinea. It is separated from the island of New Guinea by the Dampier and Vitiaz Straits and from New Ireland by St. George's Channel...

, the Admiralty Islands
Admiralty Islands
The Admiralty Islands are a group of eighteen islands in the Bismarck Archipelago, to the north of New Guinea in the south Pacific Ocean. These are also sometimes called the Manus Islands, after the largest island. These rainforest-covered islands form part of Manus Province, the smallest and...

 and on Morotai
Morotai
Morotai Island Regency is a regency of North Maluku province, Indonesia, located on Morotai Island. The population was 54,876 in 2007.-History:...

, in order to free up the Sixth Army to engage in the Philippines Campaign (1944–45).

The Eighth Army again followed in the wake of the Sixth Army in December, when it took over control of operations on Leyte Island
Leyte Island
Leyte is an island in the Visayas group of the Philippines.The island measures about 180 km north-south and about 65 km at its widest point. In the north it nearly joins Samar, separated by the San Juanico Strait, which becomes as narrow as 2 km in some places...

 on 26 December. In January, the Eighth Army entered combat on Luzon
Luzon
Luzon is the largest island in the Philippines. It is located in the northernmost region of the archipelago, and is also the name for one of the three primary island groups in the country centered on the Island of Luzon...

, landing the XI Corps
XI Corps (United States)
XI Corps was a corps of the United States Army in World War II and the Korean War.-References:* Weigley, Russell F. . Eisenhower's Lieutenants. Bloomington: Indiana University Press. ISBN 0-253-13333-5....

 on 29 January near San Antonio
San Antonio, Zambales
San Antonio is a 2nd class municipality in the province of Zambales in the Philippines. According to the latest Philippine census, it has a population of 32,494 people in 6,483 households in an area of 18,812 hectares...

 and the 11th Airborne Division
U.S. 11th Airborne Division
-Knollwood Maneuver:The 11th Airborne, as the attacking force, was assigned the objective of capturing Knollwood Army Auxiliary Airfield near Fort Bragg in North Carolina. The force defending the airfield and its environs was a combat team composed of elements of the 17th Airborne Division and a...

 on the other side of Manila Bay
Manila Bay
Manila Bay is a natural harbor which serves the Port of Manila , in the Philippines.The bay is considered to be one of the best natural harbors in Southeast Asia and one of the finest in the world...

 two days later. Combining with I Corps and XIV Corps of Sixth Army, the forces of Eighth Army next enveloped Manila
Manila
Manila is the capital of the Philippines. It is one of the sixteen cities forming Metro Manila.Manila is located on the eastern shores of Manila Bay and is bordered by Navotas and Caloocan to the north, Quezon City to the northeast, San Juan and Mandaluyong to the east, Makati on the southeast,...

 in a great double-pincer movement
Pincer movement
The pincer movement or double envelopment is a military maneuver. The flanks of the opponent are attacked simultaneously in a pinching motion after the opponent has advanced towards the center of an army which is responding by moving its outside forces to the enemy's flanks, in order to surround it...

. Eighth Army's final operation of the Pacific War
Pacific War
The Pacific War, also sometimes called the Asia-Pacific War refers broadly to the parts of World War II that took place in the Pacific Ocean, its islands, and in East Asia, then called the Far East...

 was that of clearing out the southern Philippines of the Japanese Army
Imperial Japanese Army
-Foundation:During the Meiji Restoration, the military forces loyal to the Emperor were samurai drawn primarily from the loyalist feudal domains of Satsuma and Chōshū...

, including on the major island of Mindanao
Mindanao
Mindanao is the second largest and easternmost island in the Philippines. It is also the name of one of the three island groups in the country, which consists of the island of Mindanao and smaller surrounding islands. The other two are Luzon and the Visayas. The island of Mindanao is called The...

, an effort that occupied the soldiers of the Eighth Army for the rest of the war.

Occupation

Eighth Army was to have participated in Operation Downfall
Operation Downfall
Operation Downfall was the Allied plan for the invasion of Japan near the end of World War II. The operation was cancelled when Japan surrendered after the atomic bombing of Hiroshima and Nagasaki and the Soviet Union's declaration of war against Japan. The operation had two parts: Operation...

, the invasion of Japan. It would have taken part in Operation Coronet
Operation Coronet
During World War II, two operations in the Pacific theater were called Operation Coronet.* an early planning name for Operation Chronicle, which was executed in June 1943...

, the second phase of the invasion, which would have seen the invasion of the Kanto Plain
Kanto Plain
The ' is the largest plain in Japan located in the Kanto Region of central Honshū. The total area 17,000 sq km covers more than half of the Region extending over Tokyo, Saitama Prefecture, Kanagawa Prefecture, Chiba Prefecture, Gunma Prefecture, and Tochigi Prefecture.The northern limit borders on...

 on eastern Honshū
Honshu
is the largest island of Japan. The nation's main island, it is south of Hokkaido across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyushu across the Kanmon Strait...

. However, instead of invading Japan, Eighth Army found itself in charge of occupying it peacefully. Occupation
Military occupation
Military occupation occurs when the control and authority over a territory passes to a hostile army. The territory then becomes occupied territory.-Military occupation and the laws of war:...

 forces landed on 30 August 1945, assuming responsibility for occupying all of Japan at the beginning of 1946. Four quiet years then followed, during which the Eighth Army gradually deteriorated from a combat-ready fighting force into a somewhat soft, minimally-trained constabulary. Lieutenant General Walton H. Walker took command in 1948, and he tried to re-invigorate the Army's training, but he was largely unsuccessful. This situation was to have serious consequences in South Korea.

Korean War

The peace of occupied Japan was shattered in June 1950 when North Korea
North Korea
The Democratic People’s Republic of Korea , , is a country in East Asia, occupying the northern half of the Korean Peninsula. Its capital and largest city is Pyongyang. The Korean Demilitarized Zone serves as the buffer zone between North Korea and South Korea...

 invaded South Korea, igniting the Korean War
Korean War
The Korean War was a conventional war between South Korea, supported by the United Nations, and North Korea, supported by the People's Republic of China , with military material aid from the Soviet Union...

. American naval and air forces quickly became involved in combat operations, and it was soon clear that American ground forces would have to be committed. To stem the North Korean advance, the occupation forces in Japan were thus shipped off to South Korea as quickly as possible, but their lack of training and equipment was telling, as some of the initial American units were destroyed by the North Koreans. However, the stage was eventually reached as enough units of Eighth Army arrived in Korea to make a firm front. The North Koreans threw themselves against that front, the Pusan Perimeter, and failed to break it. In the meantime, Eighth Army had reorganized, since it had too many divisions under its command for it to exercise effective control directly. The I Corps and the IX Corps were reactivated in the United States and then shipped to Korea to assume command of Eighth Army's subordinate divisions.

The stalemate was broken by the Inchon landings of the X Corps (tenth corps, consisting of soldiers and Marines). The North Korean forces, when confronted with this threat to their rear areas, combined with a breakout operation at Pusan, broke away and hastily retired.

Both South and North Korea was almost entirely occupied by United Nations forces. However, once American units neared the Yalu River
Yalu River
The Yalu River or the Amnok River is a river on the border between North Korea and the People's Republic of China....

 and the frontier between North Korea and China, the Chinese intervened and drastically changed the character of the war. Eighth Army was decisively defeated at the Battle of the Chongchon River and forced to retreat all the way back to South Korea. The defeat of the U.S. Eighth Army resulted in the longest retreat of any American military unit in history. General Walker was killed in a jeep accident and replaced by Lieutenant General Matthew Ridgway
Matthew Ridgway
Matthew Bunker Ridgway was a United States Army General. He held several major commands and was most famous for resurrecting the United Nations war effort during the Korean War. Several historians have credited Ridgway for turning around the war in favor of the UN side...

. The overstretched Eighth Army suffered heavily with the Chinese offensive, who were able to benefit from shorter lines of communication and with rather casually deployed enemy forces. The Chinese broke through the American defenses despite American air supremacy
Air supremacy
Air supremacy is the complete dominance of the air power of one side's air forces over the other side's, during a military campaign. It is the most favorable state of control of the air...

 and the Eighth Army and UN forces retreated hastily to avoid encirclement. The Chinese offensive continued pressing US forces, which lost Seoul
Seoul
Seoul , officially the Seoul Special City, is the capital and largest metropolis of South Korea. A megacity with a population of over 10 million, it is the largest city proper in the OECD developed world...

, the South Korean capital. Eighth Army's morale and esprit de corps hit rock bottom, to where it was widely regarded as a broken, defeated rabble.

General Ridgway forcefully restored Eighth Army to combat effectiveness over several months. Under his leadership, it slowed and finally halted the Chinese advance at the battles of Chipyong-ni and Wonju
Wonju
Wonju is the most populous city in Gangwon province, South Korea.Wonju is a city approximately east of Seoul and the capital can be reached within 1hr 30minutes by bus or train. Wonju is home to three major universities which attract many students from Seoul and elsewhere. They provide facilities...

. It then counter-attacked the Chinese, taking Seoul again, and driving the communist forces back above the 38th parallel
38th parallel north
The 38th parallel north is a circle of latitude that is 38 degrees north of the Earth's equatorial plane. It crosses Europe, the Mediterranean Sea, Asia, the Pacific Ocean, North America, and the Atlantic Ocean...

 into North Korea. Next, the front stabilized in the 38th parallel area.

When General Ridgway replaced General of the Army
General of the Army (United States)
General of the Army is a five-star general officer and is the second highest possible rank in the United States Army. A special rank of General of the Armies, which ranks above General of the Army, does exist but has only been conferred twice in the history of the Army...

 Douglas MacArthur
Douglas MacArthur
General of the Army Douglas MacArthur was an American general and field marshal of the Philippine Army. He was a Chief of Staff of the United States Army during the 1930s and played a prominent role in the Pacific theater during World War II. He received the Medal of Honor for his service in the...

 as the overall U.N. commander, Lieutenant General James Van Fleet
James Van Fleet
James Alward Van Fleet was a U.S. Army officer during World War I, World War II and the Korean War. Van Fleet was a native of New Jersey, who was raised in Florida and graduated from the U.S. Military Academy. He served as a regimental, divisional and corps commander during World War II and as...

 assumed command of Eighth Army. After the war of movement during the first stages, the fighting in Korea settled down to a war of attrition. Ceasefire negotiations were begun at the village of Panmunjom in the summer of 1951, and they dragged on for two years. When the Military Demarcation Line was finally agreed to by the Korean Armistice Agreement, the Eighth Army had succeeded in its mission of liberating South Korea, but the realities of a limited war in a world of nuclear weapons had become obvious. South Korea and North Korea continued on as separate states.

Post Korean War

During the aftermath of the Korean War, the Eighth Army remained in South Korea, but the forces under its command were continually reduced as the demands of the U.S. Army in Europe and then the Vietnam War
Vietnam War
The Vietnam War was a Cold War-era military conflict that occurred in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. This war followed the First Indochina War and was fought between North Vietnam, supported by its communist allies, and the government of...

 increased. By the 1960s, only the I Corps, consisting of the 7th Infantry Division and the 2nd Infantry Division, remained as part of the Eighth Army. Then, in 1971, further reductions occurred. The 7th Infantry Division was withdrawn from South Korea, along with the command units of I Corps, which were moved across the Pacific Ocean to Ft. Lewis, Washington, leaving only the 2nd Infantry Division to watch the Korean Demilitarized Zone
Korean Demilitarized Zone
The Korean Demilitarized Zone is a strip of land running across the Korean Peninsula that serves as a buffer zone between North and South Korea. The DMZ cuts the Korean Peninsula roughly in half, crossing the 38th parallel on an angle, with the west end of the DMZ lying south of the parallel and...

 and to assist the South Korean Army in defending South Korea. Besides forming a trip-wire against another North Korean invasion, the 2nd Infantry Division remained there as the only Army unit in South Korea armed with tactical nuclear weapon
Tactical nuclear weapon
A tactical nuclear weapon refers to a nuclear weapon which is designed to be used on a battlefield in military situations. This is as opposed to strategic nuclear weapons which are designed to menace large populations, to damage the enemy's ability to wage war, or for general deterrence...

s. (Otherwise, there is only the U.S. Air Force in South Korea and on Okinawa.) All nuclear weapons were taken from the Army to be under Air Force control. Later, all U.S. nuclear weapons were removed from South Korea.

An occasional armed clash aside, relations between the two Koreas remained as stable as could be expected. By the end of the Cold War
Cold War
The Cold War was the continuing state from roughly 1946 to 1991 of political conflict, military tension, proxy wars, and economic competition between the Communist World—primarily the Soviet Union and its satellite states and allies—and the powers of the Western world, primarily the United States...

, the American army and Air Force in South Korea were regarded as a trip-wire force, not so much deployed for their military use but for their political value. An attack on South Korea by North Korea would mean an attack on the U.S. Army as well. However, in 2003, plans were announced to move almost all of the 2nd Infantry Division (Eighth Army) southwards, away from the border. That would in turn reduce its "trip wire" effect. This provoked a heated debate in South Korea, where the future of the Eighth Army is still a contentious topic.

The Headquarters of the Eighth Army is located at Yongsan Garrison
Yongsan Garrison
United States Army Garrison Yongsan is located in Seoul, South Korea and is home to the headquarters for the U.S. military presence in Korea, known as United States Forces Korea , as well as the headquarters for the Eighth United States Army and Installation Management Command Korea Region...

, but it is scheduled to move southward to Camp Humphreys
Camp Humphreys
Camp Humphreys or USAG-H is a medium-sized United States Army garrison located near Anjeong-ri and south of Pyeongtaek metropolitan area in South Korea. Camp Humphreys is located 55 miles south of Seoul and is one of the U.S. Army's fastest growing installations...

 by 2016, as is the Second Infantry Division.

Current Structure

Command group

  • Commanding General: Lieutenant General
    Lieutenant General
    Lieutenant General is a military rank used in many countries. The rank traces its origins to the Middle Ages where the title of Lieutenant General was held by the second in command on the battlefield, who was normally subordinate to a Captain General....

     John D. Johnson
  • Command Sergeant Major: Command Sergeant Major Rodney D. Harris

Current structure

Eighth Army, Yongsan Garrison
Yongsan Garrison
United States Army Garrison Yongsan is located in Seoul, South Korea and is home to the headquarters for the U.S. military presence in Korea, known as United States Forces Korea , as well as the headquarters for the Eighth United States Army and Installation Management Command Korea Region...

  • 2nd Infantry Division, Camp Red Cloud
    Camp Red Cloud
    Camp Red Cloud is a United States Army camp located in the city of Uijeongbu, between Seoul and the Korean Demilitarized Zone . The installation was renamed after Medal of Honor recipient Corporal Mitchell Red Cloud, Jr...

    • 1st Heavy Brigade Combat Team, Camp Hovey
      Camp Hovey
      Camp Hovey is a United States Army military base in South Korea. It was named after Master Sergeant Howard Hovey who was killed in action at Pork Chop Hill during the Korean War. The camp is adjacent to the larger Camp Casey, connected by a road known as "Hovey Cut". It is part of an area...

    • 210th Fires Brigade
      210th Fires Brigade (United States)
      The 210th Fires Brigade, also known as the "Warrior Thunder," was formed from the assets of the former 2nd Infantry Division Artillery. It provides fire support for the 2nd Infantry Division of the United States Army...

      , Camp Casey
      Camp Casey, South Korea
      Camp Casey is an American military camp in Dongducheon , South Korea, north of Seoul, South Korea. Camp Casey was named in 1952 after Major Hugh Boyd Casey, who was killed in an airplane crash near Camp Casey during the Korean War. Camp Casey is one of several U.S. Army bases in South Korea near...

    • Combat Aviation Brigade, 2nd Infantry Division USAG Humphreys
  • 19th Sustainment Command (Expeditionary), Daegu
    Daegu
    Daegu , also known as Taegu, and officially the Daegu Metropolitan City, is a city in South Korea, the fourth largest after Seoul, Busan, and Incheon, and the third largest metropolitan area in the country with over 2.5 million residents. The city is the capital and principal city of the...

    • 501st Sustainment Brigade
      501st Sustainment Brigade (United States)
      The 501st Sustainment Brigade is a sustainment brigade of the United States Army. It provides logistical support to the 2nd Infantry Division.-History:...

      , Camp Carroll
      Camp Carroll, South Korea
      Camp Carroll is located on the south east portion of South Korea, in Waegwan, close to the city of Daegu. It is named after Sergeant First Class Charles F. Carroll, a posthumous recipient of the Distinguished Service Cross for his acts of heroism during the Korean War.Camp Carroll is located at the...

    • Army Material Support Center, Camp Carroll
  • 35th Air Defense Artillery Brigade
    35th Air Defense Artillery Brigade (United States)
    The 35th Air Defense Artillery Brigade is an air defense unit of the United States Army subordinate to the Eighth United States Army, located at Osan Air Base in the Republic of Korea.-Structure:* 35th Air Defense Artillery Brigade...

    , Osan Air Base
    Osan Air Base
    Osan Air Base , is a United States Air Force facility located in the Songtan section of Pyeongtaek City, South Korea, south of Seoul. Despite its name, Osan AB is not within Osan City, which is to the north. The base is the home of the Pacific Air Forces' 51st Fighter Wing, and a number of tenant...

  • 501st Military Intelligence Brigade
    501st Military Intelligence Brigade (United States)
    The 501st Military Intelligence Brigade is a United States Army formation, assigned to the U.S. Army Intelligence and Security Command under the Operational Control of U.S. Forces Korea located in South Korea. The 501st MI Brigade conducts Theater level multi-discipline intelligence, Aerial ISR,...

    , Yongsan Garrison
  • 1st Signal Brigade
    1st Signal Brigade (United States)
    The 1st Signal Brigade is a military communications brigade of the United States Army subordinate to the Eighth United States Army and located at Yongsan Garrison in South Korea.-Vietnam War:...

    , Yongsan Garrison
  • 65th Medical Brigade
    65th Medical Brigade (United States)
    The 65th Medical Brigade is an military medicine brigade of the United States Army subordinate to the Eighth United States Army and located at Yongsan Garrison in South Korea.* 65th Medical Brigade** Headquarters & Headquarters Company...

    , Yongsan Garrison
  • Headquarters and Headquarters Battalion, Yongsan Garrison
    • Headquarters and Headquarters Company
    • Headquarters and Headquarters Detachment
    • United Nations Command Honor Guard Company
  • Korean Service Corps Battalion, Camp Kim
    Camp Kim
    Camp Kim is located adjacent to Yongsan Garrison in Seoul, South Korea. Camp Kim is home to a USO facility, an Army and Air Force Exchange Service distribution and storage facility, an AAFES vehicle repair facility, and the Yongsan Garrison office for vehicle registration and decals.The USO...

  • UN Command Security Battalion
    United Nations Command (Korea)
    The United Nations Command is the unified command structure for the multinational military forces supporting the Republic of Korea during and after the Korean War...

    , Joint Security Area
    Joint Security Area
    The Joint Security Area is the only portion of the Korean Demilitarized Zone where South and North Korean forces stand face-to-face. It is often called the "Truce Village" in both the media and various military accounts...


External links

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