The European Theater of Operations, United States Army (ETOUSA) was a

theater Theatre or theater is a collaborative form of performing art that uses live performers, usually actors to present experiences of a real or imagined event before a live audience in a specific place, often a stage. The performers may communi ...

of Operations responsible for directing

United States Army The United States Army (USA) is the primary Land warfare, land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of th ...

operations throughout the

European theatre of World War II The European theatre of World War II was one of the two main theatres of combat during World War II, taking place from September 1939 to May 1945. The Allied powers (including the United Kingdom, the United States, the Soviet Union and Franc ...

, from 1942 to 1945. It commanded

Army Ground Forces The Army Ground Forces were one of the three autonomous components of the Army of the United States during World War II, the others being the Army Air Forces and Army Service Forces. Throughout their existence, Army Ground Forces were the la ...

(AGF),

United States Army Air Forces The United States Army Air Forces (USAAF or AAF) was the major land-based aerial warfare service component of the United States Army and ''de facto'' aerial warfare service branch of the United States during and immediately after World War II ...

(USAAF), and

Army Service Forces The Army Service Forces was one of the three autonomous components of the United States Army during World War II, the others being the Army Air Forces and Army Ground Forces, created on 9 March 1942. By dividing the Army into three large comman ...

(ASF) operations north of Italy and the

Mediterranean The Mediterranean Sea ( ) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean basin and almost completely enclosed by land: on the east by the Levant in West Asia, on the north by Anatolia in West Asia and Southern ...

coast. It was bordered to the south by the North African Theater of Operations, United States Army (NATOUSA), which later became the

Mediterranean Theater of Operations The Mediterranean Theater of Operations, United States Army (MTOUSA), originally called the North African Theater of Operations, United States Army (NATOUSA), was a military formation of the United States Army that supervised all U.S. Army for ...

, United States Army (MTOUSA). The term ''theater of operations'' was defined in the US Army field manuals as ''the land and sea areas to be invaded or defended, including areas necessary for administrative activities incident to the military operations''. In accordance with the experience of

World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...

, it was usually conceived of as a large land mass over which continuous operations would take place and was divided into two chief areas-the

combat Combat (French language, French for ''fight'') is a purposeful violent Conflict (process), conflict between multiple combatants with the intent to harm the opposition. Combat may be armed (using weapons) or unarmed (Hand-to-hand combat, not usin ...

zone, or the area of active fighting, and the Communications Zone, or area required for administration of the theater. As the armies advanced, both these zones and the areas into which they were divided would shift forward to new geographic areas of control.

History

British–American military staffs agreed during their meetings in Washington in January–March 1941 (the ABC-1 Conversations) to exchange military missions to facilitate planning for the eventuality of American entry in the war.Ray S. Cline, ''Washington Command Post: The Operations Division''
Appendix B: U.S. Army Commanders in Major Theater Commands, December 1941 – September 1945
via HyperWar, accessed March 2012 Major General James E. Chaney, an Army Air Corps officer, arrived in the United Kingdom on 18 May 1941, and on the following day, Headquarters, Special Observer Group (SPOBS), was established in London. SPOBS also had the role of studying British use of

Lend Lease Lend-Lease, formally the Lend-Lease Act and introduced as An Act to Promote the Defense of the United States (),

supplies. His formal title was the Special Army Observer in the United Kingdom and head of SPOBS. After the United States entered the war, SPOBS was succeeded by United States Army Forces in the British Isles (USAFBI), actually SPOBS under a new name. At the time of the ARCADIA Conference, December 1941 – January 1942, the decision was made to place the MAGNET forces (U.S. Forces for Northern Ireland) under the command of Maj. Gen. E.L. Daley, and make him in turn responsible to General Chaney, designated as CG, USAFBI. On 5 May 1942, Maj. Gen.

John C. H. Lee John Clifford Hodges Lee (1 August 1887 – 30 August 1958) was a career US Army engineer, who rose to the rank of lieutenant general (United States), lieutenant general and commanded the Communications Zone (ComZ) in the European Theater of Oper ...

became Commanding General, Services of Supply, U.S. Army Forces British Isles, and later deputy theater commander, ETOUSA. On 8 June 1942, the

United States Department of War The United States Department of War, also called the War Department (and occasionally War Office in the early years), was the United States Cabinet department originally responsible for the operation and maintenance of the United States Army, als ...

officially established ETOUSA in its place. Its mission was to conduct planning for the eventual retaking of Europe and to exercise administrative and operational control over U.S. forces. The 133rd Infantry Regiment of the 34th Infantry Division was the first

unit sent to Europe in World War II. The first battalion arrived in

Belfast Belfast (, , , ; from ) is the capital city and principal port of Northern Ireland, standing on the banks of the River Lagan and connected to the open sea through Belfast Lough and the North Channel (Great Britain and Ireland), North Channel ...

in late January 1942, followed by the rest of the regiment in February. These units were designated as U.S. Army Northern Ireland Forces, later incorporated within the European Theater of Operations. The 133rd and 168th Infantry Regiments trained in the peat bogs, and performed border guard patrols between British Northern Ireland and neutral Ireland. The remaining unit of the division, the 135th Infantry Regiment, arrived in May 1942.

From February 1944 the operational command was the

Supreme Headquarters Allied Expeditionary Force Supreme Headquarters Allied Expeditionary Force (SHAEF; ) was the headquarters of the Commander of Allies of World War II, Allied forces in northwest Europe, from late 1943 until the end of World War II. US General Dwight D. Eisenhower was the ...

(SHAEF) which as an Allied command also had operational control of British and all other allied land forces and tactical airforces in the European

theatre Theatre or theater is a collaborative form of performing art that uses live performers, usually actors to present experiences of a real or imagined event before a live audience in a specific place, often a Stage (theatre), stage. The performe ...

. Until SHAEF was operational ETOUSA liaised closely with the British in the planning and organising of

Operation Overlord Operation Overlord was the codename for the Battle of Normandy, the Allies of World War II, Allied operation that launched the successful liberation of German-occupied Western Front (World War II), Western Europe during World War II. The ope ...

. U.S. General

Dwight D. Eisenhower Dwight David "Ike" Eisenhower (born David Dwight Eisenhower; October 14, 1890 – March 28, 1969) was the 34th president of the United States, serving from 1953 to 1961. During World War II, he was Supreme Commander of the Allied Expeditionar ...

had multiple command appointments; he replaced Chaney in late June 1942, but in November he also commanded the Allied forces in

Operation Torch Operation Torch (8–16 November 1942) was an Allies of World War II, Allied invasion of French North Africa during the Second World War. Torch was a compromise operation that met the British objective of securing victory in North Africa whil ...

through AFHQ. Operation Torch—the invasion of French North Africa—involving the 9th, 3rd Infantry and the 2nd Armored Divisions, initiated on 8 November 1942, was the first ground combat operations for the United States in the European theater of World War II. Eisenhower then relinquished command of ETOUSA to Lt. Gen.

Frank Maxwell Andrews Frank Maxwell Andrews (February 3, 1884 – May 3, 1943) was a senior Officer (armed forces), officer of the United States Army and one of the founders of the United States Army Air Forces, which was later to become the United States Air Fo ...

in February 1943, who was killed in an air crash in May. He was replaced by Lt. Gen. Jacob L. Devers, former Chief of the Armored Force. In December 1943 it was announced that Eisenhower would be Supreme Allied Commander in Europe. In January 1944 he resumed command of ETOUSA and the following month was officially designated as the Supreme Commander of the Allied Expeditionary Forces. (Note that Supreme Headquarters of the Allied Expeditionary Forces (SHAEF) was the headquarters of the Commander of the Allied Expeditionary Forces, whereas the AFHQ was the headquarters of only the Allied forces.) He served in a dual role until the end of hostilities in Europe in May 1945. From February 1944, SHAEF was the operational command and ETOUSA administrative command. Some units were transferred between operational commands and administrative commands at different times. For example, the American 6th Army Group, which was set up under the

, commanded by Devers, to oversee

Operation Dragoon Operation Dragoon (initially Operation Anvil), known as Débarquement de Provence in French ("Provence Landing"), was the code name for the landing operation of the Allies of World War II, Allied invasion of Provence (Southern France) on 15Augu ...

, the invasion of

Southern France Southern France, also known as the south of France or colloquially in French as , is a geographical area consisting of the regions of France that border the Atlantic Ocean south of the Marais Poitevin,Louis Papy, ''Le midi atlantique'', Atlas e ...

between

Toulon Toulon (, , ; , , ) is a city in the Provence-Alpes-Côte d'Azur region of southeastern France. Located on the French Riviera and the historical Provence, it is the prefecture of the Var (department), Var department. The Commune of Toulon h ...

and

Cannes Cannes (, ; , ; ) is a city located on the French Riviera. It is a communes of France, commune located in the Alpes-Maritimes departments of France, department, and host city of the annual Cannes Film Festival, Midem, and Cannes Lions Internatio ...

, was passed to SHAEF (and into ETO) a month after the invasion which took place on 15 August 1944. By the end of 1944, Eisenhower, through SHAEF, commanded three powerful Allied army groups. In the north British 21st Army Group commanded by Field Marshal

Bernard Montgomery Field Marshal Bernard Law Montgomery, 1st Viscount Montgomery of Alamein (; 17 November 1887 – 24 March 1976), nicknamed "Monty", was a senior British Army officer who served in the First World War, the Irish War of Independence and the ...

(''"Monty"''), in the middle the American 12th Army Group commanded by General

Omar N. Bradley Omar Nelson Bradley (12 February 1893 – 8 April 1981) was a senior Officer (armed forces), officer of the United States Army during and after World War II, rising to the rank of General of the Army (United States), General of the Army. He wa ...

, and in the South the American 6th Army Group commanded by Devers. The British 21st Army Group and French elements of the 6th Army Group were not part of ETOUSA, but by that stage of the war most of the operational forces under the command of SHAEF were American. The ETOUSA planning staff in London was usually referred to by its Army Post Office number, "APO 887". After the war in Europe ended on May 8, 1945, ETOUSA became briefly U.S. Armed Forces Europe, then U.S. Forces, European Theater (USFET), and then, eventually,

United States Army Europe United States Army Europe and Africa (USAREUR-AF) is an Army Service Component Command (ASCC) /Theater Army responsible for directing United States Army operations throughout the U.S. European Command (EUCOM) and U.S. Africa Command (AFRICO ...

. Albert Coady Wedemeyer was chief author of the Victory Program, published three months before the U.S. entered the war in 1941, which advocated the defeat of the German armies on the European continent. When the U.S. entered the war after the Japanese bombed Pearl Harbor on 7 December 1941 and the U.S. was at war with both Japan and Germany, a " Europe first" a modified version of his plan was adopted by U.S. President

Franklin D. Roosevelt Franklin Delano Roosevelt (January 30, 1882April 12, 1945), also known as FDR, was the 32nd president of the United States, serving from 1933 until his death in 1945. He is the longest-serving U.S. president, and the only one to have served ...

and British Prime Minister

Winston Churchill Sir Winston Leonard Spencer Churchill (30 November 1874 – 24 January 1965) was a British statesman, military officer, and writer who was Prime Minister of the United Kingdom from 1940 to 1945 (Winston Churchill in the Second World War, ...

. Under the German first policy, the plan was expanded to include the

blueprint A blueprint is a reproduction of a technical drawing or engineering drawing using a contact print process on light-sensitive sheets introduced by Sir John Herschel in 1842. The process allowed rapid and accurate production of an unlimited number ...

for the

Normandy Normandy (; or ) is a geographical and cultural region in northwestern Europe, roughly coextensive with the historical Duchy of Normandy. Normandy comprises Normandy (administrative region), mainland Normandy (a part of France) and insular N ...

landings.

Successor organizations

ETOUSA became United States Forces European Theater (USFET) from 1 July 1945 to 15 March 1947; and then European Command (EUCOM) 15 March 1947 to 1 August 1952. Official U.S. Army lineage details for the European Theater of Operations are: *Organized 8 January 1942 in England as Headquarters, United States Army Forces in the British Isles *Redesignated 8 June 1942 as Headquarters, European Theater of Operations, United States Army *Redesignated 1 July 1945 as Headquarters, United States Forces, European Theater *Redesignated 15 March 1947 as Headquarters, European Command *Redesignated 1 August 1952 as Headquarters,

Also, on August 1, 1952, the

United States European Command The United States European Command (EUCOM) is one of the eleven Unified Combatant Command, unified combatant commands of the United States military, headquartered in Stuttgart, Germany. Its area of focus covers and 51 countries and territori ...

(USEUCOM) was established with General

Matthew Ridgway Matthew Bunker Ridgway (3 March 1895 – 26 July 1993) was a senior officer in the United States Army, who served as Supreme Allied Commander Europe (1952–1953) and the 19th Chief of Staff of the United States Army (1953–1955). Although he ...

in command. Ridgway served concurrently as the NATO

Supreme Allied Commander Europe The Supreme Allied Commander Europe (SACEUR) is the commander of the North Atlantic Treaty Organization's (NATO) Allied Command Operations (ACO) and head of ACO's headquarters, Supreme Headquarters Allied Powers Europe (SHAPE). The commander is ...

(SACEUR). USEUCOM absorbed all functions and elements of EUCOM and additionally assumed control of all US Air Force and US Navy forces in Europe.

Campaigns

The 16 officially recognized US military campaigns in the European Theater of Operations are: * North Africa campaigns: **

Egypt Egypt ( , ), officially the Arab Republic of Egypt, is a country spanning the Northeast Africa, northeast corner of Africa and Western Asia, southwest corner of Asia via the Sinai Peninsula. It is bordered by the Mediterranean Sea to northe ...

Libya Libya, officially the State of Libya, is a country in the Maghreb region of North Africa. It borders the Mediterranean Sea to the north, Egypt to Egypt–Libya border, the east, Sudan to Libya–Sudan border, the southeast, Chad to Chad–L ...

: 11 June 1942 – 12 February 1943, American participation in the

Western Desert campaign The Western Desert campaign (Desert War) took place in the Sahara Desert, deserts of Egypt and Libya and was the main Theater (warfare), theatre in the North African campaign of the Second World War. Military operations began in June 1940 with ...

Algeria Algeria, officially the People's Democratic Republic of Algeria, is a country in the Maghreb region of North Africa. It is bordered to Algeria–Tunisia border, the northeast by Tunisia; to Algeria–Libya border, the east by Libya; to Alger ...

French Morocco The French protectorate in Morocco, also known as French Morocco, was the period of French colonial rule in Morocco that lasted from 1912 to 1956. The protectorate was officially established 30 March 1912, when Sultan Abd al-Hafid signed the ...

: 8–11 November 1942, the allied landings in North Africa **

Tunisia Tunisia, officially the Republic of Tunisia, is a country in the Maghreb region of North Africa. It is bordered by Algeria to the west and southwest, Libya to the southeast, and the Mediterranean Sea to the north and east. Tunisia also shares m ...

: 17 November 1942 – 13 May 1943, the

Tunisian campaign The Tunisian campaign (also known as the battle of Tunisia) was a series of battles that took place in Tunisia during the North African campaign of the Second World War, between Axis and Allied forces from 17 November 1942 to 13 May 1943. Th ...

* Italy campaigns: **

Sicily Sicily (Italian language, Italian and ), officially the Sicilian Region (), is an island in the central Mediterranean Sea, south of the Italian Peninsula in continental Europe and is one of the 20 regions of Italy, regions of Italy. With 4. ...

: 9 July - 17 August 1943, the allied invasion and liberation of Sicily **

Naples Naples ( ; ; ) is the Regions of Italy, regional capital of Campania and the third-largest city of Italy, after Rome and Milan, with a population of 908,082 within the city's administrative limits as of 2025, while its Metropolitan City of N ...

Foggia Foggia (, ; ; ) is a city and ''comune'' (municipality) of Apulia, in Southern Italy, capital of the province of Foggia. In 2013, its population was 153,143. Foggia is the main city of a plain called Tavoliere delle Puglie, Tavoliere, also know ...

: *** Air: 18 August 1943 – 21 January 1944 *** Ground: 9 September 1943 – 21 January 1944, from the

Allied invasion of Italy The Allied invasion of Italy was the Allies of World War II, Allied Amphibious warfare, amphibious landing on mainland Italy that took place from 3 September 1943, during the Italian campaign (World War II), Italian campaign of World War II. T ...

to the

Winter Line The Winter Line was a series of German and Italian military fortifications in Italy, constructed during World War II by Organisation Todt and commanded by Albert Kesselring. The series of three lines was designed to defend a western section ...

battles **

Anzio Anzio (, also ; ) is a town and ''comune'' on region of Italy, about south of Rome. Well known for its seaside resorts, it is a fishing port and a departure point for ferries and hydroplanes to the Pontine Islands of Ponza, Palmarola, and Ve ...

: 22 January - 24 May 1944, the landing and battle at Anzio **

Rome Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...

Arno The Arno is a river in the Tuscany region of Italy. It is the most important river of central Italy after the Tiber. Source and route The river originates on Monte Falterona in the Casentino area of the Apennines, and initially takes a sou ...

: 22 January - 9 September 1944, from the landing at Anzio to the arrival at the

Gothic Line The Gothic Line (; ) was a German and Italian defensive line of the Italian Campaign of World War II. It formed Field Marshal Albert Kesselring's last major line of defence along the summits of the northern part of the Apennine Mountains du ...

** Northern Apennines: 10 September 1944 – 4 April 1945, the Gothic Line battles **

Po Valley The Po Valley, Po Plain, Plain of the Po, or Padan Plain (, , or ) is a major geographical feature of northern Italy. It extends approximately in an east-west direction, with an area of including its Venetian Plain, Venetic extension not actu ...

: 5 April - 8 May 1945, the allied spring offensive 1945 * Western Europe campaigns: ** Air Offensive Europe: 4 July 1942 – 5 June 1944, from the first American bombing mission over enemy-occupied territory in Europe to the night before

D-day The Normandy landings were the landing operations and associated airborne operations on 6 June 1944 of the Allied invasion of Normandy in Operation Overlord during the Second World War. Codenamed Operation Neptune and often referred to as ...

: 6 June - 24 July 1944, the allied landings in Normandy ** Northern France: 25 July - 14 September 1944, from

Operation Cobra Operation Cobra was an offensive launched by the First United States Army under Lieutenant General Omar Bradley seven weeks after the D-Day landings, during the Normandy campaign of World War II. The intention was to take advantage of the dis ...

to the beginning of Operation Market Garden **

: 15 August - 14 September 1944, the allied landings in Southern France **

Rhineland The Rhineland ( ; ; ; ) is a loosely defined area of Western Germany along the Rhine, chiefly Middle Rhine, its middle section. It is the main industrial heartland of Germany because of its many factories, and it has historic ties to the Holy ...

: 15 September 1944 – 21 March 1945, from Operation Market Garden to the start of the allied invasion of Germany **

Ardennes The Ardennes ( ; ; ; ; ), also known as the Ardennes Forest or Forest of Ardennes, is a region of extensive forests, rough terrain, rolling hills and ridges primarily in Belgium and Luxembourg, extending into Germany and France. Geological ...

Alsace Alsace (, ; ) is a cultural region and a territorial collectivity in the Grand Est administrative region of northeastern France, on the west bank of the upper Rhine, next to Germany and Switzerland. In January 2021, it had a population of 1,9 ...

: 16 December 1944 – 25 January 1945, the

Battle of the Bulge The Battle of the Bulge, also known as the Ardennes Offensive or Unternehmen Die Wacht am Rhein, Wacht am Rhein, was the last major German Offensive (military), offensive Military campaign, campaign on the Western Front (World War II), Western ...

Central Europe Central Europe is a geographical region of Europe between Eastern Europe, Eastern, Southern Europe, Southern, Western Europe, Western and Northern Europe, Northern Europe. Central Europe is known for its cultural diversity; however, countries in ...

: 22 March - 11 May 1945, the allied invasion of Germany

Commanders

*LTG

24 June 1942 to 4 February 1943 *LTG Frank M. Andrews 5 February 1943 to 3 May 1943 *LTG Jacob L. Devers 9 May 1943 to 15 February 1944 *GA

16 February 1944 to 30 June 1945

References

External links

; Government
Lineage and Honors Information
at the

U.S. Army Center of Military History The United States Army Center of Military History (CMH) is a directorate within the United States Army Training and Doctrine Command. The Institute of Heraldry remains within the Office of the Administrative Assistant to the Secretary of the Arm ...

Records of Headquarters, European Theater of Operations, United States Army (World War II)
at the

National Archives National archives are the archives of a country. The concept evolved in various nations at the dawn of modernity based on the impact of nationalism upon bureaucratic processes of paperwork retention. Conceptual development From the Middle Ages i ...

; General information * {{DEFAULTSORT:United States Army Europe 1942 establishments in England 1945 disestablishments in Germany Mediterranean theatre of World War II Military units and formations established in 1942 Military units and formations disestablished in 1945 Military units and formations of the United States Army in World War II Western European theatre of World War II