104-745: The Royal Staff Corps was a corps of the British Army responsible for military engineering which was founded in c. 1800 and disbanded in c. 1837 . At the time, the Royal Engineers and Corps of Royal Sappers and Miners were administered as part of the Board of Ordnance . Relations between the Ordnance and the Commander-in-Chief of the Forces , Prince Frederick, Duke of York , were poor and
208-564: A corps d'armée in 1815 for commanding his mixed allied force of four divisions against Napoleon I. When the British Army was expanded from an expeditionary force in the First World War, corps were created to manage the large numbers of divisions. The British corps in World War I included 23 infantry corps and a few mounted corps. The word was adopted for other special formations such as
312-462: A Europe first stance, giving first priority to defeating Nazi Germany. The Japanese had great difficulty replacing their losses in ships and aircraft, while American factories and shipyards produced ever increasing numbers of both. Fighting included some of the largest naval battles in history and massive Allied air raids over Japan , as well as the atomic bombings of Hiroshima and Nagasaki . Japan surrendered unconditionally on 15 August 1945 and
416-755: A bombing of the city of Darwin on 19 February, which killed at least 243 people. At the Battle of the Java Sea in late February and early March, the IJN defeated the main ABDA naval force, under Admiral Karel Doorman . The Dutch East Indies campaign ended with the surrender of Allied forces on Java and Sumatra. In March and April, an IJN carrier force launched a raid into the Indian Ocean . British Royal Navy bases in Ceylon were hit and
520-557: A Canadian corps headquarters. This corps was renamed I Canadian Corps as a second corps headquarters was established in the UK, with the eventual formation of five Canadian divisions in England. I Canadian Corps eventually fought in Italy, II Canadian Corps in northwest Europe, and the two were reunited in early 1945. After the formations were disbanded after VE Day, Canada has never subsequently organized
624-452: A MEF headquarters group, a Marine division, a Marine aircraft wing, and a force service support group (re-designated as Marine logistics group in 2005). The pre– World War II Red Army of the former USSR had rifle corps much like in the Western sense with approximately three divisions to a corps. However, after the war started, the recently purged Soviet senior command ( Stavka ) structure
728-508: A communications regiment (or a separate battalion). In 1945, air defence corps could include 1 anti-aircraft artillery brigade or division. Air defence fighters operating within the limits of responsibility of the KPVO was transferred to the corps. By the end of the war, there were 14 KPVO in the Active Army, of which 5 corps continued to carry out the tasks assigned to them even after the war, and
832-473: A corps headquarters. Royal Canadian Army Cadets : A corps size in the RCAC is different everywhere, depending on the size. The commanding officer can be a captain (Previously, Commanding Officers of a large corps could have been a Major, but that capability has been removed with the creation of CJCR Group Order 5511-1) The National Revolutionary Army (NRA) corps ( 軍團 ) was a type of military organization used by
936-480: A corps is a battlefield formation composed of two or more divisions , and typically commanded by a lieutenant general . During World War I and World War II , due to the large scale of combat, multiple corps were combined into armies which then formed into army groups . In Western armies with numbered corps, the number is often indicated in Roman numerals (e.g., VII Corps ). The Australian and New Zealand Army Corps
1040-407: A corps is also a grouping of personnel by common function, also known as an arm , service , mustering or branch . In the British Army, an administrative corps performs much the same role – for personnel that otherwise lack them – as a ceremonial regiment . An administrative corps therefore has its own cap badge , stable belt , and other insignia and traditions. In some cases, the term corps
1144-448: A dedicated Cavalry Corps of three divisions and horse artillery assigned to the corps headquarters. In the early years of the war, field artillery was either part of an artillery reserve under direct army control or assigned to individual divisions. However, after the Battle of Chancellorsville the divisional artillery was placed under corps control, with each corps assigned a brigade of between four and six batteries commanded by
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#17328552976291248-494: A defensive perimeter to absorb and defeat Allied counterattacks; Japanese decisonmakers believed such a military situation would lead to a negotiated peace that would preserve Japanese territorial gains. Japanese planning divided the early war into two operational phases. The First Operational Phase was further divided into three separate parts in which the major objectives of the Philippines, British Malaya, Borneo, Burma, Rabaul and
1352-721: A four-month campaign. The Japanese achieved major military victories, but world opinion—in particular in the US—was hostile to Japan's invasion, especially after the Panay incident . In addition, the Japanese had failed to destroy the Chinese army, which continued to resist from the new Nationalist capital in Chongqing , or in the case of the Communists, Yan'an . In 1939, Japanese forces tried to push into
1456-496: A halt. The Japanese media, influenced by military propagandists, began to refer to the embargoes as the " ABCD line " ("American-British-Chinese-Dutch"). The Japanese Imperial General Headquarters (GHQ) began planning for a war with the Western powers in April or May 1941. Japan increased its naval budget and placed large formations of the Army, along with their attached air components, under
1560-470: A major armed clash in January 1941 , effectively ending their co-operation. Japanese strategic bombing efforts mostly targeted large Chinese cities such as Shanghai, Wuhan , and Chongqing , with around 5,000 raids from February 1938 to August 1943. Japan's strategic bombing campaigns killed between 260,000 and 350,934 non-combatants . As early as 1935, Japanese military strategists had concluded that
1664-608: A major motivation for the Corps' creation was to provide a source of engineering expertise under his direct control. It was generally responsible for short-term military engineering works, with the Royal Engineers and Corps of Royal Sappers and Miners remaining responsible for permanent works, but the boundaries between the functions of the corps were blurred. The Royal Staff Corps answered to the Quartermaster-General instead of to
1768-686: A military alliance with Germany and Italy, becoming one of the three main Axis Powers . The war entered a new phase with Japanese defeats at the Battle of Suixian–Zaoyang , the 1st Battle of Changsha , the Battle of Kunlun Pass and the Battle of Zaoyi . After these victories, Chinese nationalist forces launched a large-scale counter-offensive in early 1940; however, due to a lack of military-industrial capacity, they were repulsed in late March 1940. In August 1940, Chinese communists launched an offensive in Central China ; in retaliation, Japan instituted
1872-540: A number of aides-de-camp and a general staff of other officers. This staff consisted of a chief of cavalry, a chief of artillery, and representatives of the War Department 's various bureaus: an assistant adjutant general , a quartermaster , an assistant inspector general , a commissary of subsistence, an ordnance officer (all with the rank of lieutenant colonel ), and a medical director. However, there were no dedicated combat service support formations as part of
1976-413: A numerically superior foe. This allowed Napoleon I to mass the bulk of his forces to effect a penetration into a weak section of enemy lines without risking his own communications or flank. This innovation stimulated other European powers to adopt similar military structures. The corps has remained an echelon of French Army organization to the modern day. As fixed military formation already in peace-time it
2080-399: A soldier as part of a specific corps (or sometimes individual battalion). This lanyard is a woven piece of cord which is worn on ceremonial uniforms and dates back to the issue of clasp knives in the early 20th century which were secured to the uniform by a length of cord. If a soldier is posted to a unit outside of their parent corps, except in some circumstances the soldier continues to wear
2184-496: Is also used informally, for looser groupings of independent regiments and other units – and without many or any unifying regalia , military traditions or other accoutrements – such as the Royal Armoured Corps or the "Corps of Infantry". In Australia, soldiers belong foremost to a corps which defines a common function or employment across the army. The Australian Army has a system of coloured lanyards, which each identify
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#17328552976292288-869: Is also used, referring to the period from the Mukden Incident of 1931 through 1945. The major Allied participants were China , the United States and the British Empire . China had already been engaged in a war against Japan since 1937 . The US and its territories, including the Philippine Commonwealth , entered the war after being attacked by Japan . The British Empire was also a major belligerent consisting of British troops along with colonial troops from India as well as from Burma , Malaya , Fiji , Tonga ; in addition to troops from Australia , New Zealand and Canada . The Dutch government-in-exile (as
2392-480: Is an operational-tactical formation (in the past - the highest tactical formation) of the former Soviet Air Defence Forces and now Russian Air Defence Forces /Aerospace Forces. The purpose of the such a corps is to protect important administrative, industrial and economic centers and regions of the country, groupings of troops (forces) and military facilities within the established limits of responsibility against air strikes. In organizational terms, an air defence corps
2496-494: Is composed of three or four divisions. There are three types of corps in the Indian Army: strike, holding and mixed. The corps HQ is the highest field formation in the army. The Pakistan Army has nine manoeuvre corps, each commanded by a lieutenant general . Each corps is composed of at least two divisions. The corps HQ is the highest field formation in the army. The Polish Armed Forces used independent operational groups in
2600-558: Is part of the district (or a separate army) of the Air Defence Forces. Also some air defence corps were separate. On the basis of individual corps, air defence zones or air defence corps areas could be created. The first KPVO were created in February 1938 for the air defence of Moscow , Leningrad and Baku (respectively 1st, 2nd and 3rd) based on anti-aircraft artillery divisions and air defence brigade ( 3rd KPVO ). The staff of
2704-484: Is the highest level of the forces that is concerned with actual combat and operational deployment. Higher levels of command are concerned with administration rather than operations, at least under current doctrine. The corps provides operational direction for the forces under its command. As of 2014, the active field corps in the US Army are I Corps , III Corps , and XVIII Airborne Corps ; their lineages derive from three of
2808-628: The ARVN corps areas. As of July 2016, the Army deactivated all corps headquarters save three CONUS based corps ( I Corps - Washington, III Corps - Texas, and XVIII Airborne Corps - North Carolina). In the 1960s, the Marine Corps activated the I Marine Expeditionary Force (I MEF) on Okinawa (based in California since 1971) and II Marine Expeditionary Force (II MEF) in North Carolina, and re-activated
2912-641: The Allied Rapid Reaction Corps in 1994. It is no longer a purely British formation, although the UK is the "framework nation" and provides most of the staff for the headquarters. A purely national Corps headquarters could be quickly reconstituted if necessary. It took command of the International Security Assistance Force in Afghanistan on 4 May 2006. Previously, it was deployed as the headquarters commanding land forces during
3016-848: The Asia–Pacific War or the Pacific Theater , was the theater of World War II that was fought in eastern Asia, the Pacific Ocean , the Indian Ocean , and Oceania . It was geographically the largest theater of the war, including the Pacific Ocean theater , the South West Pacific theater , the Second Sino-Japanese War , and the Soviet–Japanese War in the last few months of the war. The Second Sino-Japanese War between
3120-693: The Australian Corps , on the Western Front , under Lieutenant General Sir John Monash . During World War II, the Australian I Corps was formed to co-ordinate three Second Australian Imperial Force (2nd AIF) units: the 6th , 7th and 9th Divisions , as well as other Allied units on some occasions, in the North African campaign and Greek campaign . Following the commencement of the Pacific War , there
3224-534: The Board of Ordnance . On its disbandment, most of its personnel transferred to the Royal Engineers and the Corps of Royal Sappers and Miners. This United Kingdom military article is a stub . You can help Misplaced Pages by expanding it . Corps Corps ( / k ɔːr / ; plural corps / k ɔːr z / ; from French corps , from the Latin corpus "body") is a term used for several different kinds of organization. A military innovation by Napoleon I ,
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3328-471: The Chinese Republic , and usually exercised command over two to three NRA divisions and often a number of independent brigades or regiments and supporting units. The Chinese Republic had 133 corps during the Second Sino-Japanese War . After losses in the early part of the war, under the 1938 reforms, the remaining scarce artillery and the other support formations were withdrawn from the division and
3432-761: The Declaration by United Nations on 1 January 1942, the Allied governments appointed the British General Archibald Wavell to the American-British-Dutch-Australian Command (ABDACOM), a supreme command for Allied forces in Southeast Asia. This gave Wavell nominal control of a huge force, albeit one that was thinly spread across a vast area, from Burma to the Philippines to northern Australia. Other regions, including India, Hawaii, and
3536-855: The Dental Branch (Canadian Forces) and the Canadian Forces Medical Service of the Canadian Forces Health Services Group (CF H Svcs Gp). The Royal Canadian Army Service Corps transport and supply elements were combined with the Royal Canadian Ordnance Corps to form the Logistics Branch The Royal Canadian Army Service Corps clerical trades were merged with the Royal Canadian Army Pay Corps and
3640-663: The Empire of Japan and the Republic of China had been in progress since 7 July 1937, with hostilities dating back to 1931 with the Japanese invasion of Manchuria . However, it is more widely accepted that the Pacific War itself began on 7 December (8 December Japanese time) 1941, when the Japanese simultaneously attacked American military bases in Hawaii , Wake Island , Guam , and the Philippines ,
3744-438: The KPVO included: 4-6 anti-aircraft artillery regiments, 1 anti-aircraft machine-gun regiment, 1 searchlight regiment (or battalion), 1-2 regiments (or divisions) barrage balloons , 1- 2 regiments (or battalions) of visual observation, warning and communications ( VNOS ), and a separate communications battalion. From September 1938 to November 1940, the KPVO also included 1-2 regiments (battalions) of local air defence. During
3848-736: The Khmer Issarak , and the Hukbalahap . The Soviet Union fought two short, undeclared border conflicts with Japan in 1938 and again in 1939 , then remained neutral through the Soviet–Japanese Neutrality Pact of April 1941, until August 1945 when it (and Mongolia ) joined the rest of the Allies and invaded the territory of Manchukuo , China, Inner Mongolia , the Japanese protectorate of Korea and Japanese-claimed territory such as South Sakhalin . Mexico provided air support in
3952-658: The Kosovo War in 1999 and also saw service in Bosnia and Herzegovina , commanding the initial stages of the IFOR deployment prior to that in 1996. Otherwise, the only time a British corps headquarters has been operationally deployed since 1945 was II Corps during the Suez Crisis . The structure of a field corps in the United States Army is not permanent. On the battlefield, the corps
4056-957: The Kwantung Army to oversee its occupation of Manchukuo and the China Expeditionary Army during the Second Sino-Japanese War, created the Southern Expeditionary Army Group at the outset of its conquests of South East Asia. This headquarters controlled the bulk of the Japanese Army formations which opposed the Western Allies in the Pacific and South East Asia. In 1931, without declaring war, Japan invaded Manchuria , seeking raw materials to fuel its growing industrial economy. By 1937, Japan controlled Manchuria and
4160-400: The Officers Training Corps . Military training of teenage boys is undertaken at secondary schools through the Combined Cadet Force , in which participation was compulsory at some schools in the 1950s. Schoolboy jargon called the CCF simply "Corps". The British Army still has a corps headquarters for operational control of forces. I Corps of the British Army of the Rhine was redesignated
4264-611: The Royal Canadian Postal Corps to form the Administration Branch (later merged with the Logistics Branch ) Other "corps", included: Canadian Engineer Corps , Signalling Corps , Corps of Guides , Canadian Women's Army Corps , Royal Canadian Army Veterinary Corps , Canadian Forestry Corps , Canadian Provost Corps and Canadian Intelligence Corps . Pacific War Allied occupation of Japan Second Sino-Japanese War Taishō period Shōwa period Asia-Pacific Mediterranean and Middle East Other campaigns Coups The Pacific War , sometimes called
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4368-516: The South West Pacific . US sources refer to two theaters within the Pacific War: the Pacific theater and the China Burma India Theater (CBI). However, these were not operational commands. In the Pacific, the Allies divided operational control of their forces between two supreme commands, known as Pacific Ocean Areas and Southwest Pacific Area . The Imperial Japanese Navy (IJN) did not integrate its units into permanent theater commands. The Imperial Japanese Army (IJA), which had already created
4472-435: The Soviet Far East . They were defeated in the Battle of Khalkhin Gol by a mixed Soviet and Mongolian force led by Georgy Zhukov . This caused the Japanese to abandon attempts to expand to the north , while Soviet aid to China ceased as a result of the Soviet–Japanese Neutrality Pact. In September 1940, Japan decided to invade French Indochina , which was controlled at the time by Vichy France . On 27 September Japan signed
4576-603: The Thai government signed an armistice and entered an alliance with Japan. Although Japan declared war on the United States and the British Empire , the declaration was not delivered until after Japanese forces had already struck British and American targets. In the early hours of 7 December (Hawaiian time), carrier-based Japanese aircraft launched a surprise, large-scale air strike on the U.S. Pacific Fleet's anchorage at Pearl Harbor in Honolulu, which knocked eight American battleships out of action, destroyed 188 American aircraft, and killed 2,403 Americans. The Japanese believed that
4680-458: The " Three Alls Policy " ("Kill all, Burn all, Loot all") in occupied areas, killing at least 2.7 million civilians. By 1941 the conflict had become a stalemate. Although Japan had occupied much of northern, central, and coastal China, the Nationalist Government had retreated to the interior and set up a provisional capital at Chongqing , while the Chinese communists remained in control of base areas in Shaanxi . Japanese offensive action against
4784-422: The Allied embargo. This was known as the Southern Plan . It was decided—because of the close relationship between the U.K. and the U.S., and the belief that the U.S. would inevitably become involved in the ongoing war in Europe—that Japan would also seize the Philippines, Wake Island and Guam . Japan had initially planned for a limited war, where Japanese forces would seize key objectives and then establish
4888-414: The Allies staging areas from which to mount a counteroffensive. By November 1941 these plans were mostly complete, and were modified only slightly over the next month. Japanese military planners' expectation of success rested on the United Kingdom and the Soviet Union being unable to effectively respond to a Japanese attack because of the threat posed to each by Nazi Germany; in particular, the Soviet Union
4992-417: The Americans, faced with such a sudden and massive blow to their naval power in the Pacific, would agree to a negotiated settlement. However, American losses were less serious than initially thought: the three American aircraft carriers were at sea during the attack, and vital naval infrastructure, Honolulu's submarine base, and signals intelligence units were unscathed. The fact that the bombing happened while
5096-416: The Armistice, the peacetime Canadian militia was nominally organized into corps and divisions but no full-time formations larger than a battalion were ever trained or exercised. Early in the Second World War, Canada's contribution to the British-French forces fighting the Germans was limited to a single division. After the fall of France in June 1940, a second division moved to England, coming under command of
5200-516: The Armour Branch continued to use the title Royal Canadian Armoured Corps , the Infantry Branch continued to use the Royal Canadian Infantry Corps designation, and the Artillery Branch uses the term Royal Regiment of Canadian Artillery . When the Army, Royal Canadian Navy , and Royal Canadian Air Force were merged in 1968 to form the Canadian Forces, the Royal Canadian Dental Corps and Royal Canadian Army Medical Corps were deactivated and merged with their Naval and Air Force counterparts to form
5304-447: The Army and Marines diverged in their approach to the concept of the field corps. The Army continued to group its divisions into traditional corps organizations in the Continental United States (CONUS), West Germany ( V Corps and VII Corps ), and South Korea (I Corps). However, during the Vietnam War , the Army designated its corps-level headquarters in South Vietnam as I Field Force and II Field Force to avoid confusion with
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#17328552976295408-406: The British colonies of Malaya , Singapore , and Hong Kong , and invaded Thailand . The Pacific War saw the Allies pitted against Japan, the latter aided by Thailand and to a lesser extent by the Axis powers , Germany and Italy . The Japanese achieved great success in the initial phase of the campaign, but were gradually driven back using an island hopping strategy. The Allies adopted
5512-449: The Chinese 38th Division, led by Sun Li-jen . Meanwhile, in the Battle of Yunnan-Burma Road , the Japanese captured Toungoo after hard fighting and sent motorized units to capture Lashio . This cut the Burma Road , which was the western Allies' supply line to Chinese Nationalist troops. Many of Chinese troops were forced either to retreat to India, or withdraw in small parties to Yunnan . Accompanied by large numbers of civilian refugees,
5616-410: The Civil War lacked standing organization at the corps and division levels, it moved swiftly to adopt these during the mobilization for the Spanish–American War in the spring of 1898. On 7 May, General Order 36 called for the establishment of seven "army corps" (repeating the nomenclature of the Civil War); an eighth was authorized later that month. Two of these saw action as a unit: the Fifth in Cuba and
5720-399: The Confederate corps at the Battle of Gettysburg , for instance, exceeded 20,000 men. However, for both armies, unit sizes varied dramatically with attrition throughout the war. In Civil War usages, by both sides, it was common to write out the number, thus "Twenty-first Army Corps", a practice that is usually ignored in modern histories of the war. Although the US Army in the years following
5824-429: The Dutch East Indies were, due to their abundant oil reserves, crucially important for further expansion by the Japanese Empire. By 1940 the Japanese also included Indochina, Malaya, and the Philippines within their concept of the Greater East Asia Co-Prosperity Sphere. Japanese troop build-ups in Hainan, Taiwan, and Haiphong were noted in foreign media, Japanese military officers were increasingly and openly talking about
5928-428: The Dutch East Indies would be occupied. The Second Operational Phase called for further expansion into the South Pacific by seizing eastern New Guinea, New Britain, Fiji, Samoa, and strategic points in around Australia. In the Central Pacific, Midway Island was targeted, as were the Aleutian Islands in the North Pacific. Japanese strategists believed that the seizure of these key areas would provide defensive depth and deny
6032-433: The Eighth in the Philippines; elements of the First , Fourth , and Seventh made up the invasion force for Puerto Rico (the Second, Third , and Seventh provided replacements and occupation troops in Cuba, while the Sixth was never organized). The corps headquarters were disbanded during the months following the signing of the peace treaty (with the exception of the Eighth Army Corps, which remained active until 1900 due to
6136-452: The Great Patriotic War from November 1941 to April 1944 the air defence corps were renamed into air defence corps areas (such as the Stalingrad Corps Region ). The corps districts included up to 9 anti-aircraft artillery regiments and 14 separate anti-aircraft artillery battalions, up to 3 anti-aircraft machine-gun regiments, 1 searchlight regiment, 1 regiment (or division) of barrage balloons, up to 4 regiments (or separate battalions) VNOS, and
6240-481: The III Amphibious Corps (which had been deactivated in 1946) as III Marine Expeditionary Force (III MEF) in South Vietnam (re-deployed to Okinawa in 1971). In 1965, all three MEFs were subsequently re-designated as Marine amphibious forces or MAFs, and in 1988 all three Marine Corps corps-level commands were again re-designated as Marine expeditionary forces (MEF). The MEF had evolved into a self-contained, corps-level, Marine air-ground task force (MAGTF) consisting of
6344-500: The IJN and IJA launched simultaneous surprise attacks on the United States and the British Empire on 7 December (8 December in Asia/West Pacific time zones). The locations of this first wave of Japanese attacks included the American territories of Hawaii, the Philippines , Guam , and Wake Island and the British territories of Malaya , Singapore , and Hong Kong . Concurrently, Japanese forces invaded southern and eastern Thailand and were resisted for several hours, before
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#17328552976296448-459: The Japanese puppet states of Manchukuo (consisting of most of Manchuria ), and the collaborationist Wang Jingwei regime (which controlled the coastal regions of China), respectively. Japan conscripted many soldiers from its colonies of Korea and Taiwan . Collaborationist security units were also formed in Hong Kong , Singapore , the Philippines , the Dutch East Indies , British Malaya , British Borneo , former French Indochina (after
6552-563: The Japanese on 15 February 1942. About 130,000 Indian, British, Australian and Dutch personnel became Japanese prisoners of war. Bali and Timor fell in February. The rapid collapse of Allied resistance left the "ABDA area" split in two. Wavell resigned from ABDACOM on 25 February, handing control of the ABDA Area to local commanders and returning to the post of Commander-in-Chief, India . Meanwhile, Japanese aircraft had all but eliminated Allied air power in Southeast Asia and were carrying out air attacks on northern Australia , beginning with
6656-443: The Soviet air defence corps were also created. In June–July 1960, all KPVO were enlarged and consisted of: anti-aircraft missile regiments and brigades, air defense fighter regiments, radio engineering regiments and brigades, separate electronic warfare battalions, regiments and battalions of communications and logistics institutions. In many English-speaking countries and other countries influenced by British military traditions,
6760-422: The US was not officially at war caused a wave of outrage across the country. Japan's fallback strategy, relying on a war of attrition against the United States, was beyond the Imperial Japanese Navy's capabilities. Opposition to war in the United States vanished after the attack. On 8 December, the United Kingdom, the United States, Canada, and the Netherlands declared war on Japan, followed by Australia
6864-503: The Western powers through armed forces of the Greater East Asia Co-Prosperity Sphere . Japanese officials integrated what they called the Japan–China Incident ( 日支事変 , Nisshi Jihen ) into the Greater East Asia War. During the Occupation of Japan (1945–52), these terms were prohibited in official documents (although their informal usage continued). The war became officially known as the Pacific War ( 太平洋戦争 , Taiheiyō Sensō ) . The Fifteen Years' War ( 十五年戦争 , Jūgonen Sensō )
6968-403: The aircraft carrier HMS Hermes was sunk, along with other Allied ships. The attack forced the Royal Navy to withdraw to the western part of the Indian Ocean, paving the way for a Japanese assault on Burma and India. In Burma, the Japanese captured Moulmein on 31 January 1942, and then drove outnumbered British and Indian troops towards the Sittang River . On 23 February, a bridge over
7072-414: The army. Major General George B. McClellan , for example, planned to organize the Army of the Potomac into corps of two or more divisions and about 25,000 soldiers. However, he delayed doing so, partly for lack of experienced officers, and partly for political reasons, until March 1862 when President Lincoln ordered their creation. The exact composition of a corps in the Union Army varied during
7176-463: The brigade pattern were created in the Belorussian Military District (Western TVD/Strategic Direction) and the 48th Separate Guards Army Corps in the Transbaikal Military District , but abandoned after a few years. The Soviet Air Forces used ground terminology for its formations down to squadron level. As intermediates between the aviation division and the air army were corps—these also had three air divisions each. An Air Defence Corps ('KPVO')
7280-496: The city, which fell to Japan after three months of fighting. The Japanese continued to push deeper into China, capturing the capital Nanjing in mid-December 1937 and committing atrocities in the Nanjing Massacre , including rape, murder and torture. In March 1938, Nationalist forces won their first victory at Taierzhuang , but the city of Xuzhou was taken by the Japanese in May. In June 1938, Japan deployed about 350,000 troops to invade Wuhan and captured it in October after
7384-407: The command of the Imperial Japanese Navy. Historically, the IJA consumed the majority of the state's military budget (with a 73% - 27% split in 1940), but from 1942 to 1945 the IJA would account for 60% of Japan's military spending, while the IJN would account for 40%. Japan's key initial objective was to seize economic resources in the Dutch East Indies and Malaya, in order to alleviate the effects of
7488-544: The corps formed during World War I (I and III Corps) and World War II (XVIII Airborne Corps). On 12 February 2020, it was announced that the Army was reactivating V Corps to bolster the presence of US forces in Europe. The first field corps in the United States Army were legalized during the American Civil War by an act of Congress on 17 July 1862, although the term had been used previously to refer to any large portion of
7592-482: The corps. This meant that either civilian workers had to be hired or line soldiers detailed from their units to carry out the necessary tasks. Initially, corps were numbered in relation to their field army, such as I Army Corps, Army of the Potomac. After a while these numerical designations became unique to each corps regardless of the army to which they were assigned. Although designated with numbers that are sometimes
7696-693: The eruption of the Philippine–American War ), and like the corps of the Civil War, their lineage ends at that point. During World War I, the American Expeditionary Forces (AEF) adopted the common European usage of designating field corps by Roman numerals . Several " corps areas " were designated under the authority of the National Defense Act of 1920 , but played little role until the Army's buildup for World War II. While some of
7800-535: The first formal combined-arms groupings of divisions with reasonably stable manning and equipment establishments. Napoleon I first used the corps d'armée in 1805. The use of the corps d'armée was a military innovation that provided Napoleon I with a significant battlefield advantage in the early phases of the Napoleonic Wars . The corps was designed to be an independent military group containing cavalry, artillery and infantry, and capable of defending against
7904-598: The form of the 201st Fighter Squadron and Free France sent naval support in the form of Le Triomphant and later the Richelieu . The Axis -aligned states which assisted Japan included the authoritarian government of Thailand . Also involved were members of the Greater East Asia Co-Prosperity Sphere, which included the Manchukuo Imperial Army and Collaborationist Chinese Army of
8008-541: The formation was first named as such in 1805. The size of a corps varies greatly, but two to five divisions and anywhere from 40,000 to 80,000 are the numbers stated by the US Department of Defense. Within military terminology a corps may be: These usages often overlap. Corps may also be a generic term for a non-military organization , such as the US Peace Corps and European Solidarity Corps . In many armies,
8112-864: The hat badge and lanyard of their corps (e.g. a clerk posted to an infantry battalion would wear the hat badge of the Royal Australian Ordnance Corps but would wear the lanyard of the battalion they are posted to). In Canada , with the integration of the Canadian Army into the Canadian Forces , the British corps model was replaced with personnel branches , defined in Canadian Forces Administrative Orders (CFAOs) as "...cohesive professional groups...based on similarity of military roles, customs and traditions." CFAO 2-10) However,
8216-468: The lower numbered corps were used for various exercises, the inter-war years corps served mostly as a pool of units. During that war, the Marine Corps organized corps headquarters for the first time, the I Marine (later III Amphibious Corps ) and V Amphibious Corps . The Army ultimately designated 25 field corps (I–XVI, XVIII–XXIV, XXXVI, and I Armored Corps ) during World War II. After the Korean War ,
8320-545: The next day. Thailand, with its territory already serving as a springboard for Japan's Malayan Campaign , surrendered within hours of the Japanese invasion. The government of Thailand formally allied with Japan on 21 December. To the south, the IJA seized the British colony of Penang on 19 December, encountering little resistance. Hong Kong was attacked on 8 December and fell to Japanese forces on 25 December 1941. American bases on Guam and Wake Island were seized by Japan at around
8424-750: The overthrow of the French regime in 1945 ), as well as Timorese militia . Germany and Italy both had limited involvement in the Pacific War. The German and the Italian navies operated submarines and raiding ships in the Indian and Pacific Oceans, notably the Monsun Gruppe . Between 1942 and 1945, there were four main areas of conflict in the Pacific War: China, the Central Pacific , South-East Asia and
8528-495: The place of the corps before and during World War II . An example would be Independent Operational Group Polesie . The groups, as the name indicates, were more flexible and showed greater capacity to absorb and integrate elements of broken units over a period of just a couple days and keep cohesion during the September Campaign than more traditional army units such as divisions, regiments, or even brigades. Wellington formed
8632-854: The possessor of the Dutch East Indies ) was also involved. All of these were members of the Pacific War Council . From 1944 the French commando group Corps Léger d'Intervention also took part in resistance operations in Indochina. Some active pro-allied guerrillas in Asia included the Malayan Peoples' Anti-Japanese Army , the Korean Liberation Army , the Free Thai Movement , the Việt Minh ,
8736-706: The prospect of war, and Admiral Sankichi Takahashi was reported as stating that a showdown with the US was necessary. In an effort to discourage Japanese militarism, Western powers including Australia, the US, Britain, and the Dutch government in exile , which controlled the Dutch East Indies, stopped selling oil , iron ore, and steel to Japan. In Japan, the government and Japanese nationalists viewed these embargoes as acts of aggression; imported oil made up about 80% of domestic consumption, without which Japan's economy would grind to
8840-648: The rest of Australia, remained under local commands. On 15 January, Wavell moved to Bandung in Java to assume control of ABDACOM. In January, Japan invaded British Burma, the Dutch East Indies, New Guinea, and the Solomon Islands, and captured Manila, Kuala Lumpur and Rabaul . After being driven out of Malaya, Allied forces in Singapore attempted to resist the Japanese during the Battle of Singapore, but were forced to surrender to
8944-462: The rest of the corps were disbanded. In July 1947, all KPVO were renamed anti-aircraft artillery corps. In January 1949, part of these corps was reorganized into air defence areas. From December 1948 to January 1949, all anti-aircraft artillery corps were disbanded. In June 1954, for the defense of the main industrial and economic centers and regions of the USSR, 10 air defence corps were re-created. At
9048-470: The retreating and regrouping Chinese forces was largely stalled by the mountainous terrain in southwestern China, while the Communists organized widespread guerrilla and saboteur activities in northern and eastern China behind the Japanese front line. Japan sponsored several puppet governments , one of which was headed by Wang Jingwei . Conflicts between Chinese Communist and Nationalist forces vying for territorial control behind enemy lines culminated in
9152-624: The river was demolished prematurely, stranding most of an Indian division. On 8 March, the Japanese occupied Rangoon . The Allies attempted to defend Central Burma, with Indian and Burmese divisions holding the Irrawaddy River valley and the Chinese Expeditionary Force in Burma defending Toungoo . On 16 April, 7,000 British soldiers were encircled by the Japanese 33rd Division during the Battle of Yenangyaung , but subsequently rescued by
9256-879: The same as those found in the modern US Army, there is no direct lineage between the 43 Union field corps of the Civil War and those with similar names in the modern era, due to congressional legislation caused by the outcry from veterans of the Grand Army of the Republic during the Spanish–American War . In the Confederate States Army , field corps were authorized in November 1862. They were commanded by lieutenant generals, and were usually larger than their Union Army counterparts because their divisions contained more brigades, each of which could contain more regiments. All of
9360-452: The same time, in addition to anti-aircraft artillery formations, fighter aviation regiments and divisions were included in the corps. Since the late 1950s, anti-aircraft artillery units have been replaced by anti-aircraft missile formations and formations of radio engineering troops. Searchlight and barrage balloon units were also abolished. In the Warsaw Pact countries, groupings similar to
9464-509: The same time. British, Australian, and Dutch forces, already drained of personnel and matériel by two years of war with Germany, and heavily committed in the Middle East, North Africa, and elsewhere, were unable to provide more than token resistance. Two major British warships, the battlecruiser HMS Repulse and the battleship HMS Prince of Wales , were sunk by a Japanese air attack off Malaya on 10 December 1941. Following
9568-412: The senior-most artillery officer. In general, the other field armies tended to model their organization after the Army of the Potomac, including the gradual development of corps. Corps were commanded by major generals because Congress refused to promote officers past that grade (with the exception of Ulysses S. Grant to lieutenant general in 1864). To assist with their command, generals were allowed
9672-471: The war, the tank and mechanized corps were re-rated as divisions. During the reforms of 1956–58, most of the corps were again disbanded to create the new combined arms and tank armies. A few corps were nevertheless retained. The Vyborg and Archangel Corps of the Leningrad Military District were smaller armies with three low-readiness motorized rifle divisions each. In the 1980s "Unified Corps" on
9776-413: The war, though it usually consisted of between two and six division (on average three) for approximately 36,000 soldiers. After Ambrose Burnside was given command of the Army of the Potomac in November 1862, he reorganized it into three "grand divisions" of two corps and a cavalry division each, but this structure was abolished when Joseph Hooker took over February 1863. This also led to the creation of
9880-456: Was occupied by the Allies. Japan lost its former possessions in Asia and the Pacific and had its sovereignty limited to the four main home islands and other minor islands as determined by the Allies. In Allied countries during the war, the "Pacific War" was not usually distinguished from World War II , or was known simply as the War against Japan . In the United States, the term Pacific theater
9984-604: Was a phased withdrawal of I Corps to Australia, and the transfer of its headquarters to the Brisbane area, to control Allied army units in Queensland and northern New South Wales (NSW). II Corps was also formed, with Militia units, to defend south-eastern Australia, and III Corps controlled land forces in Western Australia . Sub-corps formations controlled Allied land forces in the remainder of Australia. I Corps headquarters
10088-574: Was apparently unable to handle the formations, and the armies and corps were integrated. Rifle corps were re-established during the war after Red Army commanders had gained experience handling larger formations. Before and during World War II, however, Soviet armoured units were organized into corps. The pre-war mechanized corps were made up of divisions. In the reorganizations, these "corps" were reorganized into tank brigades and support units, with no division structure. Owing to this, they are sometimes, informally, referred to as "brigade buckets". After
10192-745: Was held at corps, or army level or higher. The corps became the basic tactical unit of the NRA having strength nearly equivalent to an allied division . The modern People's Liberation Army Ground Force group army ( 集团军 ) is the closest equivalent of a corps. After the military reforms of the early 2010s, a typical PLA group army consists of six combined arms brigades, plus additional artillery, air defence, engineering, sustainment, special operations and army aviation assets. Each formation contains approximately 30,000 combat troops and several thousands more supporting personnel. The French Army under Napoleon I used corps-sized formations ( French : corps d'armée ) as
10296-664: Was later assigned control of the New Guinea campaign . In early 1945, when I Corps was assigned the task of re-taking Borneo , II Corps took over in New Guinea. Canada first fielded a corps-sized formation in the First World War; the Canadian Corps was unique in that its composition did not change from inception to the war's end, in contrast to British corps in France and Flanders. The Canadian Corps consisted of four Canadian divisions. After
10400-642: Was prepared to move deeper into China. The Marco Polo Bridge Incident on 7 July 1937 provoked full-scale war between China and Japan. The Nationalist Party and the Chinese Communists suspended their civil war in order to form a nominal alliance against Japan, and the Soviet Union quickly lent support by providing large amounts of materiel to Chinese troops. In August 1937, Generalissimo Chiang Kai-shek deployed some of his best troops to defend Shanghai against some 300,000 Japanese troops attempting to seize
10504-514: Was raised in 1914, consisting of Australian and New Zealand troops, who went on to fight at Gallipoli in 1915. In early 1916, the original corps was reorganized and two corps were raised: I ANZAC Corps and II ANZAC Corps . In the later stages of World War I, the five infantry divisions of the First Australian Imperial Force (AIF)—consisting entirely of personnel who had volunteered for service overseas—were united as
10608-476: Was seen as unlikely to commence hostilities. The Japanese leadership was aware that a total military victory in the traditional sense against the United States was impossible, and instead envisaged that rapid, aggressive and expansive conquest would force the U.S. to agree to a negotiated peace that would recognize Japanese hegemony in Asia. Following prolonged tensions between Japan and the Western powers , units of
10712-413: Was used almost in all European armies after Battle of Ulm in 1805. In Prussia it was introduced by Order of His Majesty ( German : Allerhöchste Kabinetts-Order ) from 5 November 1816, in order to strengthen the readiness to war. The Indian Army has 14 corps , each commanded by a general officer commanding (GOC), known as the corps commander, who holds the rank of lieutenant general . Each corps
10816-665: Was widely used. The US Armed Forces considered the China Burma India theater to be distinct from the Asiatic-Pacific theater during the conflict. Japan used the name Greater East Asia War ( 大東亜戦争 , Dai Tō-A Sensō ) , as chosen by a cabinet decision on 10 December 1941, to refer to both the war with the Western Allies and the ongoing war in China. This name was released to the public on 12 December, with an explanation that it involved Asian nations achieving their independence from
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