The First World War (1914 to 1918) was an unprecedented, devasting global conflict fought on a vast scale. 65 million people around the world fought in the war and over the course of the conflict, 880,000 British forces died. 

It was characterised by brutal trench warfare and led to the advances in weaponry and military technology and innovations across medicine, manufacturing and communications. 

The First World War affected all of British society and transformed people's everyday life at home, affecting food shortages and the introduction of rationing, the role of women, impact on children and recruitment of men into the armed forces. 

Key facts

Find out more about kay facts and battles of the First World War. 

Sommerschau über Europa 1915 [Summer Show over Europe 1915]
IWM (Art.IWM PST 6966)
First World War

Key facts about the First World War

Over 30 nations declared war between 1914 and 1918. Over 65 million men volunteered or were conscripted to fight in mass citizen armies and an estimated 16 million soldiers and civilians were left dead and countless others physically and psychologically wounded. 

Bomb damage to 61 - 67 Warrington Crescent in St John's Wood, London, following the German air raid on the night of 7 - 8 March 1918.
IWM
First World War

Firsts of the First World War

The First World War was a war of innovation. Advances in weaponry and military technology provoked tactical changes as each side tried to gain an advantage over the other. Here are 10 important 'firsts' that happened during the First World War, the effects of which can still be felt today.

Three French troops manning a machine gun
© IWM (Q 69971)
First World War

Key battles of the First World War

From the largest naval battle, and the longest battle, to the most painful and infamous battle, and the battle that marked the end of mobile warfare on the Western Front, discover 10 significant battles of the First World War that took place between 1914-1918.

Outbreak

How did the First World War start?

On 28 June 1914, Archduke Franz Ferdinand, the heir to the Austro-Hungarian throne was assassinated.  In the ensuing crisis, Europe's leaders made a series of political, diplomatic and military decisions that turned a localised conflict into a global war.

Causes of the First World War
Europe map with boundaries containing caricatured soldiers of each nation. Armed Central Powers soldiers attack Entente Powers' soldiers.
IWM
There were all sorts of Christmas greetings being shouted across no man’s land at us
Colin Wilson, Grenadier Guards, 1914
British and German soldiers fraternising at Ploegsteert, Belgium, on Christmas Day 1914, Front of 11th Brigade, 4th Division.
IWM Q 70074
British and German soldiers fraternising at Ploegsteert, Belgium, on Christmas Day 1914, Front of 11th Brigade, 4th Division.

Major battles

Read more about the major battles of the First World War. 

Officers of a Field Ambulance at their mess, Gully Beach
© IWM (Q 13360)
Gallipoli

Why was Gallipoli one of the worst fighting fronts of the First World War?

Of all the varied parts of the world where British and Commonwealth forces were deployed during the First World War, Gallipoli was remembered by its veterans as one of the worst places to serve.

The bow and stern of HMS Invincible sticking out of the water as the battlecruiser sinks during the battle of Jutland.
© IWM (SP 2470)
Battle of Jutland

Battle of Jutland

The Battle of Jutland (31 May - 1 June 1916) was the largest naval battle of the First World War. It was the only time that the British and German fleets of 'dreadnought' battleships actually came to blows. 

Four German troops stand next to a German 17cm heavy artillery gun firing.
IWM (Q 56546)
First World War

Battle of Verdun

The Battle of Verdun (21 February to 15 December 1916) became the longest battle in modern history. It was originally planned by the German Chief of General Staff, Erich von Falkenhayn to secure victory for Germany on the Western Front. 

Soldiers of 'A' Company, 11th Battalion, the Cheshire Regiment, occupy a captured German trench at Ovillers-la-Boisselle on the Somme.
© IWM (Q 3990)
Battle of the Somme

Battle of the Somme

The Battle of the Somme (1 July to 18 November 1916) was one of the largest and bloodiest battles of the First World War. The campaign was a joint operation between British and French forces intended to achieve a decisive victory over the Germans on the Western Front. For many in Britain, the resulting battle remains the most painful and infamous episode of the First World War. 

A British soldier tending a war grave near Ypres, 1 October 1917. Part of the grave reads 'E. Knowles.'
IWM (Q 6037)
Battle of Passchendaele

Battle of Passchendaele

The Third Battle of Ypres - often called Passchendaele - has come to symbolise the loss and futility of the First World War. Fought in 1917, the battle was another attempt to win a decisive breakthrough on the Western Front. 

Officers of the 2nd Battalion, King's Own Yorkshire Light Infantry, 62nd Division, conferring with French and Italian officers in the Bois de Reims.
IWM (Q 11113)
Western Front

Hundred Days Offensive

Explore the story of the crucial battles fought in the last months of the First World War. 

A world war

The First World War had a major impact on all involved, both at home in Britain and in other countries. Read more about how different people were affected by the conflict. 

Three German infantrymen looking over the top of a snowy trench.
© IWM (Art.IWM PST 0462)
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Germany

Germany in the First World War

Germany was one of the Central Powers and joined the First World War following a declaration of war against Serbia by its ally, Austria-Hungary. The Germans began the First World War with high hopes of a quick victory, but enthusiasm soon evaporated.

British recruitment poster, 1914.
IWM PST 2734
First World War

Who Participated in the First World War?

In Britain and across the Empire people geared up to defeat the enemy. This effort required the tireless, and often willing participation of military and civilians to support the conflict.

Forward scouts of the 9th Hodson's Horse (Bengal Lancers), Indian Army, pause to consult a map, near Vraignes, April 1917.
IWM (Q 2061)
First World War

The vital role of India in the First World War

In October 1914, the British Expeditionary Force (BEF) was at breaking point. The stage was set for a German victory. However, the 45,000 men of Indian Expeditionary Force A were about to arrive. Curator Alan Wakefield explores the vital contribution of the Indian Expeditionary Force.

Uncle Sam in blue coat, red stock and star-decorated hat faces the viewer with a serious expression. He is pointing with his right hand at the viewer
Image: IWM (Art.IWM PST 3137)
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First World War

The United States and the First World War

When the First World War broke out in August 1914, the United States remained neutral, but neutrality became an impossibility as the conflict unfolded.

Recruiting and Training in the West Indies: Jamaica: A contingent of West Indian troops marching through Kingston, Jamaica on the way to the harbour, 1916.
First World War

The West Indies war effort in the First World War

When war broke out in 1914, the British colonies in the West Indies quickly pledged their support to Britain in men, money and materials. King George V called for 'men of every class, creed and colour' to join the fight against Germany. 

How did the First World War end?

Find out more about how the First World War came to an end in 1918. 

Officers of the 1st Battalion, Irish Guards, read details of the Armistice with German to their men, 12 November 1918.
© IWM (Q 3365)
Armistice

The Armistice

In the autumn of 1918, Germany and its allies were exhausted. Their armies were defeated and their hungry citizens were beginning to rebel. As early as 29 September German General and Stategist Erich Ludendorff decided that a cessation of hostilities must be sought. 

 Group of leading allied politicians sign the Treaty of Versailles surrounded by the hall of mirrors.
© IWM (Art.IWM ART 2856)
Armistice

Treaty of Versailles

On 11 November 1918, an armistice came into effect ending the war in Western Europe – but this did not mean the return of peace. The armistice was effectively a German surrender, as its conditions ended any possibility of Germany continuing the war. 

 Indian troops who died of influenza being carried to the burning ghats © Q 13074
Armistice

'Spanish Flu' the pandemic of 1918 to 1920

Find out about the deadly pandemic that swept the world in 1918 and hear the stories of those who witnessed the consequences. 

A line of armed revolutionaries of the Spartacist Movement standing in a Berlin street.
© IWM (Q 110864)
Armistice

Conflict in Europe after the First World War

The First World War ended - but it did not mean an end to fighting in Europe. 

Every individual, man or woman, soldier, sailor, airman or civilian may be able to find in these galleries an example or an illustration of the sacrifice he made or the work he did.
Sir Alfred Mond
View of the army section display, Imperial War Museum, Crystal Palace, 1920.
© IWM Q 31438
Remembrance

How is the First World War commemorated?

The human cost of the First World War was one of its defining legacies. Modern ways of remembering emerged from the different ways that people tried to cope with the huge loss of life it caused.

Remembrance and the First World War
An interwar Earl Haig Fund 'Remembrance Day' poppy.
© IWM (EPH 2313)
Interwar period British 'Remembrance Day' poppy which belonged to Colonel Wilson of the Salvation Army.
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