Background Until the
Wars of the Three Kingdoms (1639–1653), neither England nor Scotland had a
standing army with professional officers and career corporals and sergeants. England relied on
militia organised by local officials or private forces mobilised by the nobility, or on hired mercenaries from Europe. From the
later Middle Ages until the Wars of the Three Kingdoms, when a foreign expeditionary force was needed, such as the one that King
Henry V of England took to
France and that fought at the
Battle of Agincourt (1415), the army, a professional one, was raised for the duration of the expedition. During the Wars of the Three Kingdoms, the members of the English
Long Parliament realised that the use of county militia organised into regional associations (such as the
Eastern Association), often commanded by local members of Parliament (both from the House of Commons and the House of Lords), while more than able to hold their own in the regions which
Parliamentarians ('Roundheads") controlled, were unlikely to win the war. So Parliament initiated two actions. The
Self-denying Ordinance forbade members of Parliament (with the notable exception of
Oliver Cromwell, then a member of parliament and future
Lord Protector) from serving as officers in the Parliamentary armies. This created a distinction between the civilians in Parliament, who tended to be
Presbyterian and conciliatory to the Royalists ("Cavaliers") in nature, and a corps of professional officers, who tended to be Independent (
Congregational) in theology. The second action was legislation for the creation of a Parliamentary-funded army, commanded by Lord General
Thomas Fairfax, which became known as the
New Model Army (originally phrased "new-modelled Army"). While this proved to be a war-winning formula, the New Model Army, being organised and politically active, went on to dominate the politics of the
Interregnum and by 1660 was widely disliked. The New Model Army was paid off and disbanded at the later
Restoration of the monarchy in 1660 with the accession of King
Charles II. For many decades the alleged excesses of the New Model Army under
the Protectorate / Commonwealth under Oliver Cromwell were used as propaganda (and still feature in Irish folklore) and the
Whig Party element recoiled from allowing a standing army to continue with the agreed-upon rights and privileges under the return of a king. The militia acts of 1661 and 1662 prevented local authorities from calling up militia and oppressing their own local opponents. Calling up the militia was possible only if the king and local elites agreed to do so. King Charles II and his "
Cavalier" / Royalist supporters favoured a new army under royal control, and immediately after the Restoration of 1660 to 1661 began working on its establishment. The first
English Army regiments, including elements of the disbanded
New Model Army, were formed between November 1660 and January 1661 and became a standing military force for England (financed by
Parliament). The
Royal Scots and
Irish Armies were financed by the parliaments of
Scotland and
Ireland. Parliamentary control was established by the
Bill of Rights 1689 and
Claim of Right Act 1689, although the monarch continued to influence aspects of army administration until at least the end of the 19th century. After the Restoration, King Charles II pulled together four regiments of infantry and cavalry, calling them his guards, at a cost of £122,000 from his general budget. This became the foundation of the permanent English Army. By 1685, it had grown to number 7,500 soldiers in marching regiments, and 1,400 men permanently stationed in garrisons. A
Monmouth Rebellion in 1685 allowed successor King
James II to raise the forces to 20,000 men. There were 37,000 in 1678, when England played a role in the closing stage of the cross-channel
Franco-Dutch War. After
Protestant dual Monarchs
William III, formerly William of the Dutch
House of Orange, and his wife
Mary II's joint accession to the throne after a short constitutional crisis with Parliament sending Mary's father, predecessor King James II, (who remained a Catholic) during his brief controversial reign, off the throne and into exile. England then involved itself in the
War of the Grand Alliance on the Continent, primarily to prevent a possible French Catholic monarch organizing an invasion restoring the exiled James II (Queen Mary's father and still a
Roman Catholic). Later in 1689, William III to solidify his and Mary's hold on the monarchy, expanded the new English army to 74,000, and then a few years later to 94,000 in 1694. Parliament was very nervous and reduced the cadre to 70,000 in 1697. Scotland and Ireland had theoretically separate military establishments, but they were unofficially merged with the English Crown force. , was one of the first generals in the new British Army and fought in the War of the Spanish Succession. He was a noted ancestor of Sir
Winston S. Churchill, later famous
Prime Minister during
World War II.
Formation By the time of the 1707
Acts of Union, many regiments of the English and Scottish armies were already combined under one operational command and stationed in the
Netherlands for the
War of the Spanish Succession. Although all the regiments were now part of the new British military establishment, they remained under the old operational-command structure and retained much of the institutional ethos, customs and traditions of the standing armies created shortly after the
Restoration of the Monarchy 47 years earlier. The order of seniority of the most-senior British Army line regiments is based on that of the earlier English army. Although technically the Scots
Royal Regiment of Foot was raised in 1633 and is the oldest Regiment of the Line, Scottish and Irish regiments were only allowed to take a rank in the English army on the date of their arrival in England (or the date when they were first placed on the English establishment). In 1694, a board of general officers was convened to decide the rank of English, Irish and Scots regiments serving in the Netherlands; the regiment which became known as the
Scots Greys were designated the
4th Dragoons because there were three English regiments raised prior to 1688 when the Scots Greys were first placed in the English establishment. In 1713, when a new board of general officers was convened to decide the rank of several regiments, the seniority of the Scots Greys was reassessed and based on their June 1685 entry into England. At that time there was only one English regiment of dragoons, and the Scots Greys eventually received the British Army rank of 2nd Dragoons.
British Empire (1707–1914) After 1707, British continental policy was to contain expansion by competing powers such as France and Spain. Although Spain was the dominant global power during the previous two centuries and the chief threat to England's early trans-Atlantic colonial ambitions, its influence was now waning. The territorial ambitions of the French, however, led to the War of the Spanish Succession and the later
Napoleonic Wars. British soldiers captured strategically important sites and territories, with the army involved in wars to secure the empire's borders, internal safety and support friendly governments and princes. Among these actions were the French and Indian War / Seven Years' War, the
American Revolutionary War, the
Napoleonic Wars, the
First and
Second Opium Wars, the
Boxer Rebellion, the
New Zealand Wars, the
Australian frontier wars, the
Sepoy Rebellion of 1857, the
first and
second Boer Wars, the
Fenian raids, the
Irish War of Independence, interventions in
Afghanistan (intended to maintain a
buffer state between
British India and the
Russian Empire) and the
Crimean War (to keep the Russian Empire to the north on the
Black Sea at a safe distance by aiding the
Ottoman Empire). Like the
English Army, the British Army fought the kingdoms of Spain, France (including the
First French Empire) and the Netherlands (
Dutch Republic) for supremacy in
North America and the
West Indies. With native and provincial and colonial assistance, the Army conquered
New France in the
French and Indian War (North American theatre) of the parallel
Seven Years' War The British Army was defeated in the
American Revolutionary War, losing the
Thirteen Colonies but retaining
The Canadas and
The Maritimes as in
British North America, including
Bermuda (originally part of the
Colony of Virginia, and which had been originally strongly sympathetic to the American colonial rebels early in the war).
Halifax, Nova Scotia and
Bermuda were to become
Imperial fortresses (although Bermuda, being safer from attack over water and impervious to attack overland, quickly became the most important in British North America), along with
Malta and
Gibraltar, providing bases in the eastern
Atlantic Ocean and
Mediterranean Sea for
Royal Navy squadrons to control the oceans and trade routes, and heavily garrisoned by the British Army both for defence of the bases and to provide mobile military forces to work with the Navy in amphibious operations throughout their regions. and
Field Marshal von Blücher's triumph over
Napoleon Bonaparte at the
Battle of Waterloo The British Army was heavily involved in the
Napoleonic Wars, participating in a number of campaigns in Europe (including continuous deployment in the
Peninsular War), the
Caribbean, North Africa and
North America. The war between the British and the
First French Empire of
Napoleon Bonaparte stretched around the world; at its peak in 1813, the regular army contained over 250,000 men. A coalition of Anglo-Dutch and Prussian armies under the
Duke of Wellington and
Field Marshal von Blücher finally defeated Napoleon at
Waterloo in 1815. The English were involved politically and militarily in Ireland. The campaign of English republican Protector
Oliver Cromwell involved uncompromising treatment of the Irish towns (most notably
Drogheda and
Wexford) which supported the Royalists during the
English Civil War. The English Army (and the subsequent British Army) remained in Ireland primarily to suppress Irish revolts or disorder. In addition to its conflict with Irish nationalists, it was faced with the prospect of battling Anglo-Irish and
Ulster Scots in Ireland who were angered by unfavourable taxation of Irish produce imported into Britain. With other Irish groups, they raised a volunteer army and threatened to emulate the American colonists if their conditions were not met. Learning from their experience in America, the British government sought a political solution. The British Army fought Irish rebels—Protestant and Catholic—primarily in
Ulster and
Leinster (
Wolfe Tone's United Irishmen) in the
1798 rebellion. , a small British force repelled an attack by overwhelming
Zulu forces; eleven
Victoria Crosses were awarded for its defence. In addition to battling the armies of other European empires (and its former colonies, the United States, in the
War of 1812), the British Army fought the Chinese in the First and Second
Opium Wars Inspired by the successes of the
Prussian Army (which relied on short-term conscription of all eligible young men to maintain a large reserve of recently discharged soldiers, ready to be recalled on the outbreak of war to immediately bring the small peacetime regular army up to strength), the
Regular Reserve of the British Army was originally created in 1859 by
Secretary of State for War Sidney Herbert, and re-organised under the
Reserve Force Act 1867. Prior to this, a soldier was generally enlisted into the British Army for a 21-year engagement, following which (should he survive so long) he was discharged as a Pensioner. Pensioners were sometimes still employed on garrison duties, as were younger soldiers no longer deemed fit for expeditionary service who were generally organised in invalid units or returned to the regimental depot for home service. The cost of paying pensioners, and the obligation the government was under to continue to employ invalids as well as soldiers deemed by their commanding officers as detriments to their units were motivations to change this system. The long period of engagement also discouraged many potential recruits. The long service enlistments were consequently replaced with short service enlistments, with undesirable soldiers not permitted to re-engage on the completion of their first engagement. The size of the army also fluctuated greatly, increasing in war time, and drastically shrinking with peace. Battalions posted on garrison duty overseas were allowed an increase on their normal peacetime establishment, which resulted in their having surplus men on their return to a
Home station. Consequently, soldiers engaging on short term enlistments were enabled to serve several years with the colours and the remainder in the Regular Reserve, remaining liable for recall to the colours if required. Among the other benefits, this thereby enabled the British Army to have a ready pool of recently trained men to draw upon in an emergency. The name of the Regular Reserve (which for a time was divided into a
First Class and a
Second Class) has resulted in confusion with the
Reserve Forces, which were the pre-existing part-time, local-service home-defence
forces that were auxiliary to the British Army (or
Regular Force), but not originally part of it: the
Yeomanry,
Militia (or
Constitutional Force) and
Volunteer Force. These were consequently also referred to as
Auxiliary Forces or
Local Forces. The late-19th-century
Cardwell and
Childers Reforms gave the army its modern shape and redefined its
regimental system. The 1907
Haldane Reforms created the
Territorial Force as the army's volunteer reserve component, merging and reorganising the Volunteer Force and Yeomanry, while the Militia was replaced by the Special Reserve.
World Wars (1914–1945) ; the guidance wheels behind the main body were later scrapped as unnecessary. Armoured vehicles of the era required considerable infantry and artillery support.
(Photo by Ernest Brooks) (part of the
46th (Highland) Brigade), advance through Normandy during
Operation Epsom on 26 June 1944 Great Britain was challenged by other powers, primarily the
German Empire and
Nazi Germany, during the 20th century. A century earlier it vied with Napoleonic France for global pre-eminence, and
Hanoverian Britain's natural allies were the kingdoms and principalities of
northern Germany. By the middle of the 19th century, Britain and France were allies in preventing Russia's appropriation of the
Ottoman Empire, although the fear of French invasion led shortly afterwards to the creation of the Volunteer Force. By the first decade of the 20th century, the United Kingdom was allied with France (by the
Entente Cordiale) and Russia (which had a secret agreement with France for mutual support in a war against the
Prussian-led German Empire and the
Austro-Hungarian Empire). When the First World War broke out in August 1914 the British Army sent the
British Expeditionary Force (BEF), consisting mainly of
regular army troops, to
France and Belgium. The fighting bogged down into static
trench warfare for the remainder of the war. In 1915 the army created the
Mediterranean Expeditionary Force to invade the
Ottoman Empire via
Gallipoli, an unsuccessful attempt to capture
Constantinople and secure a sea route to
Russia. The First World War was the most devastating in
British military history, with nearly 800,000 men killed and over two million wounded. Early in the war, the BEF was virtually destroyed and was replaced first by
volunteers and then by a
conscript force. Major battles included those at
the Somme and
Passchendaele. Advances in technology saw the advent of the
tank (and the creation of the
Royal Tank Regiment) and advances in aircraft design (and the creation of the
Royal Flying Corps) which would be decisive in future battles. Trench warfare dominated Western Front strategy for most of the war, and the use of
chemical weapons (disabling and poison gases) added to the devastation. The
Second World War broke out in September 1939 with the Soviet and
German Army's
invasion of Poland. British
assurances to the Poles led the British Empire to declare war on
Germany. As in the First World War, a relatively small
BEF was sent to France After the British Army recovered from its earlier defeats, it defeated the Germans and Italians at the
Second Battle of El Alamein in
North Africa in 1942–1943 and helped drive them from Africa. It then fought through
Italy and, with the participation of American, Canadian, Australian, New Zealand, Indian and Free French forces, was one of the principal organisers alongside the U.S. Army and participant in the
D-Day invasion of Normandy on 6 June 1944; nearly half the Allied soldiers were British. In the
Far East, the British Army rallied against the Japanese in the
Burma Campaign and regained the British Far Eastern colonial possessions.
Postcolonial era (1945–2000) After the Second World War the British Army was significantly reduced in size, although
National Service continued until 1960. This period saw
decolonisation begin with the
partition and
independence of India and Pakistan, followed by the independence of British colonies in Africa and Asia. The
Corps Warrant, which is the official list of which bodies of the British Military (not to be confused with
naval) Forces were to be considered Corps of the British Army for the purposes of the
Army Act, the Reserve Forces Act, 1882, and the Territorial and Reserve Forces Act, 1907, had not been updated since 1926 (Army Order 49 of 1926), although amendments had been made up to and including Army Order 67 of 1950. A new Corps Warrant was declared in 1951. Although the British Army was a major participant in
Korea in the early 1950s during this period Britain's role in world events was reduced and the army was downsized. The
British Army of the Rhine, consisting of
I (BR) Corps, remained in Germany as a bulwark against Soviet invasion. The
Cold War continued, with significant technological advances in warfare, and the army saw the introduction of new weapons systems. Despite the decline of the British Empire, the army was engaged in
Aden,
Indonesia,
Cyprus, In 1982, the British Army and the
Royal Marines helped liberate the
Falkland Islands during the
conflict with Argentina after that country's invasion of the British territory. In the three decades following 1969, the army was heavily deployed in
Northern Ireland's
Operation Banner to support the
Royal Ulster Constabulary (later the
Police Service of Northern Ireland) in their conflict with republican paramilitary groups. The locally recruited
Ulster Defence Regiment was formed, becoming home-service battalions of the
Royal Irish Regiment in 1992 before it was disbanded in 2006. Over 700 soldiers were killed during
the Troubles. Following the 1994–1996
IRA ceasefires and since 1997, demilitarisation has been part of the peace process and the military presence has been reduced. On 25 June 2007 the 2nd Battalion of the
Princess of Wales's Royal Regiment left the army complex in
Bessbrook,
County Armagh, ending the longest operation in British Army history.
Persian Gulf War " in 1991. The British Army contributed 50,000 troops to the coalition which fought
Iraq in the
Persian Gulf War, and British forces controlled
Kuwait after its liberation. Forty-seven British military personnel died during the war.
Balkan conflicts The army was deployed to former
Yugoslavia in 1992. Initially part of the
United Nations Protection Force, in 1995 its command was transferred to the
Implementation Force (IFOR) and then to the
Stabilisation Force in Bosnia and Herzegovina (SFOR); the commitment rose to over 10,000 troops. In 1999, British forces under SFOR command were sent to
Kosovo and the contingent increased to 19,000 troops. Between early 1993 and June 2010, 72 British military personnel died during operations in the former Yugoslavian countries of Bosnia, Kosovo and Macedonia.
The Troubles Although there have been permanent garrisons in Northern Ireland throughout its history, the British Army was deployed as a peacekeeping force from 1969 to 2007 in
Operation Banner. Initially, this was (in the wake of
unionist attacks on nationalist communities in
Derry and
Belfast) to prevent further loyalist attacks on Catholic communities; it developed into support of the
Royal Ulster Constabulary (RUC) and its successor, the
Police Service of Northern Ireland (PSNI) against the
Provisional Irish Republican Army (PIRA). Under the 1998
Good Friday Agreement, there was a gradual reduction in the number of soldiers deployed. In 2005, after the PIRA declared a ceasefire, the British Army dismantled posts, withdrew many troops and restored troop levels to those of a peacetime garrison. Operation Banner ended at midnight on 31 July 2007 after about 38 years of continuous deployment, the longest in British Army history. According to an internal document released in 2007, the British Army had failed to defeat the IRA but made it impossible for them to win by violence. Operation Helvetic replaced Operation Banner in 2007, maintaining fewer service personnel in a more-benign environment. Of the 300,000 troops who served in Northern Ireland since 1969, there were 763 British military personnel killed and 306 killed by the British military, mostly civilians. An estimated 100 soldiers committed suicide during Operation Banner or soon afterwards and a similar number died in accidents. A total of 6,116 were wounded.
Sierra Leone The British Army deployed to Sierra Leone for
Operation Palliser in 1999, under United Nations resolutions, to aid the government in quelling violent uprisings by militiamen. British troops also provided support during the 2014
West African Ebola virus epidemic.
Recent history (2000–present) War in Afghanistan in Helmand Province In November 2001, as part of
Operation Enduring Freedom with the United States, the United Kingdom deployed forces in
Afghanistan to topple the
Taliban in
Operation Herrick. The
3rd Division were sent to
Kabul to assist in the liberation of the capital and defeat Taliban forces in the mountains. In 2006 the British Army began concentrating on fighting Taliban forces and bringing security to
Helmand Province, with about 9,500 British troops (including marines, airmen and sailors) deployed at its peak—the second-largest force after that of the US. In December 2012 Prime Minister
David Cameron announced that the combat mission would end in 2014, and troop numbers gradually fell as the
Afghan National Army took over the brunt of the fighting. Between 2001 and 26 April 2014 a total of 453 British military personnel died in Afghan operations. Operation Herrick ended with the handover of
Camp Bastion on 26 October 2014, but the British Army maintained a deployment in Afghanistan as part of
Operation Toral. Following an announcement by the US Government of the end of their operations in the Afghanistan, the Ministry of Defence announced in April 2021 that British forces would withdraw from the country by 11 September 2021. It was later reported that all UK troops would be out by early July. Following the collapse of the Afghan Army, and the completion of the withdrawal of civilians, all British troops had left by the end of August 2021.
Iraq War battlegroup engage Iraqi positions with an
81mm mortar south of Basra In 2003, the United Kingdom was a major contributor to the
invasion of Iraq, sending a force of over 46,000 military personnel. The British Army controlled southern Iraq, and maintained a peace-keeping presence in
Basra. All British troops were withdrawn from Iraq by 30 April 2009, after the Iraqi government refused to extend their mandate. One hundred and seventy-nine British military personnel died in Iraqi operations.
Recent military aid The British Army maintains a standing liability to support the civil authorities in certain circumstances, usually in either niche capabilities (e.g. explosive ordnance removal) or in general support of the civil authorities when their capacity is exceeded. In recent years this has been seen as army personnel supporting the civil authorities in the face of the
2001 United Kingdom foot-and-mouth outbreak, the 2002 firefighters strike, widespread flooding in 2005, 2007, 2009, 2013 and 2014,
Operation Temperer following the
Manchester Arena bombing in 2017 and, most recently,
Operation Rescript during the
COVID-19 pandemic.
Baltic states Since 2016, the British Army has maintained a presence in the
Baltic states in support of the
NATO Enhanced Forward Presence strategy which responded to the
2014 Russian annexation of Crimea. The British Army leads a multinational armoured battlegroup in
Estonia under Operation Cabrit and contributes troops to another military battle group in
Poland. As part of the NATO plans, Britain has committed a full mechanized infantry
brigade to be on a high state of readiness to defend Estonia.
Ukraine Between 2015 and 2022, the British Army deployed Short Term Training Teams (STTTs) to
Ukraine under
Operation Orbital to help train the
Armed Forces of Ukraine against further Russian aggression. This operation was succeeded by
Operation Interflex in July 2022. == Modern army ==