IV Corps was a

corps Corps (; plural ''corps'' ; from French , from the Latin "body") is a term used for several different kinds of organization. A military innovation by Napoleon I, the formation was first named as such in 1805. The size of a corps varies great ...

-sized formation of the

United States Army The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, ...

that saw service in both

World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was List of wars and anthropogenic disasters by death toll, one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, ...

and

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...

World War I

The corps was first organized on 20 June 1918, during

as part of the

American Expeditionary Forces The American Expeditionary Forces (A. E. F.) was a formation of the United States Army on the Western Front of World War I. The A. E. F. was established on July 5, 1917, in France under the command of General John J. Pershing. It fought along ...

. Under Major General Charles H. Muir serving on the

Western Front Western Front or West Front may refer to: Military frontiers * Western Front (World War I), a military frontier to the west of Germany *Western Front (World War II), a military frontier to the west of Germany *Western Front (Russian Empire), a maj ...

, as ''Headquarters IV Army Corps''. It participated in the offensives of St. Mihiel and Lorraine, being demobilized in

Weimar Republic The Weimar Republic (german: link=no, Weimarer Republik ), officially named the German Reich, was the government of Germany from 1918 to 1933, during which it was a Constitutional republic, constitutional federal republic for the first time in ...

, 11 May 1919.

World War II

Formerly reactivated without interruptions since October 1939, during

, the IV Corps was reconstituted on 27 June 1944, replacing the

VI Corps 6 Corps, 6th Corps, Sixth Corps, or VI Corps may refer to: France * VI Cavalry Corps (Grande Armée), a cavalry formation of the Imperial French army during the Napoleonic Wars * VI Corps (Grande Armée), a formation of the Imperial French army du ...

in the

U.S. Fifth Army The United States Army North (ARNORTH) is a formation of the United States Army. An Army Service Component Command (ASCC) subordinate to United States Northern Command (NORTHCOM), ARNORTH is the joint force land component of NORTHCOM.

order of battle In modern use, the order of battle of an armed force participating in a military operation or campaign shows the hierarchical organization, command structure, strength, disposition of personnel, and equipment of units and formations of the armed ...

in the Italian campaign, after Allied forces liberated the Italian capital of

Rome , established_title = Founded , established_date = 753 BC , founder = King Romulus ( legendary) , image_map = Map of comune of Rome (metropolitan city of Capital Rome, region Lazio, Italy).svg , map_caption ...

in the summer of 1944 when VI Corps was withdrawn to take part in

Operation Dragoon Operation Dragoon (initially Operation Anvil) was the code name for the landing operation of the Allied invasion of Provence ( Southern France) on 15August 1944. Despite initially designed to be executed in conjunction with Operation Overlord ...

, the Allied invasion of southern France. Initially the corps had two divisions—the U.S. 1st and

South African 6th Armoured Division The 6th South African Armoured Division was the second armoured division of the South African Army and was formed during World War II. Established in early 1943, it was based on a nucleus of men from the former 1st South African Infantry Di ...

s—but was reinforced with the U.S. 92nd Infantry Division from August, the 1st Brazilian Infantry Division from September, and the U.S. 10th Mountain Division in February 1945, as well as the U.S. 85th Infantry Division in April. Under command of

Major General Major general (abbreviated MG, maj. gen. and similar) is a military rank used in many countries. It is derived from the older rank of sergeant major general. The disappearance of the "sergeant" in the title explains the apparent confusion of ...

Willis D. Crittenberger, the IV Corps took part in the fighting through the summer of 1944 as the Fifth Army, under the command of

Lieutenant General Lieutenant general (Lt Gen, LTG and similar) is a three-star military rank (NATO code OF-8) 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 th ...

Mark W. Clark Mark Wayne Clark (May 1, 1896 – April 17, 1984) was a United States Army officer who saw service during World War I, World War II, and the Korean War. He was the youngest four-star general in the US Army during World War II. During World War I ...

, and the

British Eighth Army The Eighth Army was an Allied field army formation of the British Army during the Second World War, fighting in the North African and Italian campaigns. Units came from Australia, British India, Canada, Czechoslovakia, Free French Force ...

, commanded by

Sir Oliver W. H. Leese, advanced north to the

River 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 s ...

. In the autumn and winter of 1944 the IV Corps formed the central wing of the Fifth Army's sector, taking the major role in the Fifth Army's assault on the

Gothic Line The Gothic Line (german: Gotenstellung; it, Linea Gotica) was a German 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 ...

in the central

Apennine Mountains The Apennines or Apennine Mountains (; grc-gre, links=no, Ἀπέννινα ὄρη or Ἀπέννινον ὄρος; la, Appenninus or – a singular with plural meaning;''Apenninus'' (Greek or ) has the form of an adjective, which wou ...

, fighting to break through to the Lombardy plains beyond.

Inactivation

In the spring of 1945 the corps, still in the Fifth Army's central sector, took part in the successful Italian spring offensive, breaking out of the Apennines to outflank the units of the German Tenth and Fourteenth Armies defending

Bologna Bologna (, , ; egl, label= Emilian, Bulåggna ; lat, Bononia) is the capital and largest city of the Emilia-Romagna region in Northern Italy. It is the seventh most populous city in Italy with about 400,000 inhabitants and 150 different na ...

and forming a pincer with the British Eighth Army on the right to surround them, and then driving on to the

River Po The Po ( , ; la, Padus or ; Ancient Ligurian: or ) is the longest river in Italy. It flows eastward across northern Italy starting from the Cottian Alps. The river's length is either or , if the Maira, a right bank tributary, is included. Th ...

and finally

Verona Verona ( , ; vec, Verona or ) is a city on the Adige River in Veneto, Italy, with 258,031 inhabitants. It is one of the seven provincial capitals of the region. It is the largest city municipality in the region and the second largest in nor ...

and

Brescia Brescia (, locally ; lmo, link=no, label= Lombard, Brèsa ; lat, Brixia; vec, Bressa) is a city and '' comune'' in the region of Lombardy, Northern Italy. It is situated at the foot of the Alps, a few kilometers from the lakes Garda and Iseo ...

. The corps was inactivated on 13 October 1945, at Camp Kilmer, New Jersey, it was reactivated again at Birmingham, Alabama, in 1958 and inactivated at Birmingham in 1968.Ibidem Wilson, 1999.

Bibliography

* Clark, Mark Wayne. ''Calculated Risk''. New York: Enigma Books, 1950, republished 2007. * Moraes, Mascarenhas de, ''The Brazilian Expeditionary Force, By Its Commander'' US Government Printing Office, 1966. ASIN B000PIBXCG * Crittenberger, Willis D., "The final campaign across Italy"; (1st Print 1952) (of 1997 printing ) *Wilson, John B. "Armies, Corps, Divisions, and Separate Brigades , Army Lineage Series" U.S. Government Printing Office, 1999. CMH Pub 60-7-1.

Notes

{{reflist 04 04 Military units and formations established in 1918 Military units and formations disestablished in 1968