what are the causes of ww1 essay

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Main Causes of World War 1: Discussion

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Updated: 16 November, 2023

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The essay explores the causes of World War 1, which took place from 1914 to 1918. It begins with a brief overview of the war's timeline and the major countries involved, including the United Kingdom, France, Russia, Italy, Romania, Japan, the United States of America, Germany, Austria, Hungary, Bulgaria, and the Ottoman Empire. The essay then delves into the four main causes of the war: Militarism, Nationalism, Imperialism, and Alliances.

Militarism is discussed as the policy of maintaining a strong military force and a readiness to use it aggressively for defense. The significant arms buildup and military spending by various countries, including Germany, are highlighted as contributing factors to the outbreak of the war.

Nationalism is described as the strong attachment to one's own nation and culture. It is explained how nationalism led to conflicts, including the assassination of Archduke Franz Ferdinand, which triggered Austria's desire for revenge.

Imperialism, the expansion of a nation's power by dominating other countries, is presented as a factor due to the competition among European powers over control of African resources and territories.

Lastly, the essay discusses the role of Alliances, where countries formed partnerships to defend each other, often resulting in a domino effect of declarations of war.

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• Causes of World War 1

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Causes o f world war 1, nationalism and imperialism.

A Good Hook Examples for WWI Essay

• A Glimpse into the Trenches: Step back in time and experience the chilling reality of life in the trenches of World War I. In this essay, we’ll immerse ourselves in the harrowing tales of soldiers who faced the horrors of the Great War.
• The War to End All Wars: Explore the monumental impact of World War I on global history. In this essay, we’ll dissect the events that led to the war, the key players, and the lasting consequences that continue to shape our world today.
• The Poetry of Conflict: World War I inspired a generation of poets to capture the raw emotions of battle. Join us as we analyze the powerful verses and poignant imagery that emerged from the trenches.
• Lessons from the Great War: As we commemorate the centennial of World War I, it’s crucial to reflect on the lessons learned from this catastrophic conflict. This essay delves into the war’s impact on diplomacy, technology, and the human spirit.
• Unsung Heroes of WWI: Beyond the famous generals and political leaders, there were countless unsung heroes in the Great War. In this essay, we’ll shine a light on the remarkable stories of bravery and sacrifice from the trenches to the home front.
• Strachan, H. (2014). The First World War: To Arms. Oxford University Press.
• MacMillan, M. (2013). The War That Ended Peace: The Road to 1914. Random House.
• Fay, S. B. (1928). The Origins of the World War (Vol. 1). The Macmillan Company.
• Gildea, R. (2003). Children of the Revolution: The French, 1799-1914. Harvard University Press.
• Kennedy, P. M. (1980). The Rise of the Anglo-German Antagonism, 1860-1914. Allen & Unwin.

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The four MAIN causes of World War I explained

In 1914, a chain of events set off by the shot of a lone assassin in Sarajevo plunged the world into its first truly global conflict.

However, the reasons of this catastrophe ran far deeper than just this single event. In fact, Europe had been simmering for decades, bound together by fragile alliances, fierce rivalries, and the ambitions of empires.

Every decision, every treaty, and every political move, the great powers edged closer to war.

What, then, were the forces that made such destruction almost inevitable?

To explain the causes of the war, historians have tried to simplify it down to four main causes.

They create the acronym: MAIN. 

Imperialism

Nationalism.

While this acronym is a useful way to remember the range of causes , it is important to be aware that this is a modern construction used to simplify very complex ideas.

One of the most commonly discussed causes of WWI was the system of alliances that existed by 1914, the year the war started.

An 'alliance' is an agreement made between two countries, where each side promises to help the other if required.

Most of the time, this involves military or financial assistance. On occasion, it also involved political obligations which may not always lead directly to military action.

Regardless, when an alliance is created, the countries involved are known as 'allies'.

By the dawn of the First World War , many European countries had entered into one or more alliances with other countries.

The most important of these was the Triple Alliance, which was formed in 1882, consisting of Germany, Austria-Hungary, and Italy. This created a powerful bloc in the centre of Europe.

In response to the Triple Alliance, the Triple Entente was formed in 1907, uniting France, Russia, and Britain in a loose agreement to counterbalance the power of Germany and its allies.

However, there were some notable examples of countries that tried to remain out of the alliance system.

This included neutral nations like Switzerland and the Netherlands, which had policies of neutrality that kept them out of the entangled alliance systems.

What made the formation of alliances an important cause of WWI, was the fact that these alliances were designed for mutual defense: meaning that if one member was attacked, others were bound to defend them.

So, if just one country attacked another, most of Europe would immediately be at war, as each country jumped in to help out their friends. 

Imperialism, as a concept, has been around for a very long time in human history. Imperialism is the desire to build an empire for your country.

This usually involves invading and taking land owned by someone else and adding it to your empire. 

By the 19th century, many European countries had been involved in imperialism by conquering less advanced nations in Asia, the Americas or Africa.

In fact, the fierce colonial competition for territories in Africa, known as the ' Scramble for Africa ', meant that nations like Germany, Britain, and France vied for dominance by seizing large tracts of land from smaller nations.

By 1900, the British Empire was the largest imperial power in the world. It controlled parts of five different continents and owned about a quarter of all land in the world.

France was also a large empire, with control over parts of south-east Asia and Africa.

By 1910, Germany had been trying to build its own empire to rival that of Britain and France and was interested in expanding its colonial holdings.

Germany's aggressive foreign policy was known as Weltpolitik, and it expressly aimed to expand its influence and challenge Britain’s dominance, particularly in terms of colonial acquisitions and naval strength.

This meant that when an opportunity for a war of conquest became available, Germany was very keen to take advantage of it.

Militarism is the belief that a country's army and navy (since air forces didn't exist at the start of WWI) were the primary means that nations resolved disagreement between each other.

It also glorified military power, which led to the belief that military solutions were desirable or inevitable when seeking a resolution to international conflicts.

As a result, countries like to boast about the power of their armed forces.

Some countries spent money improving their land armies, while others spent money on their navies.

Some countries tried to gain the advantage by having the greatest number of men in their armies, while others focused more on having the most advanced technology in their forces.

Regardless of how they approached it, countries used militarism as a way of gaining an edge on their opponents.

Kaiser Wilhelm II , the German Emperor from 1888 to 1918, invested a lot of time and effort into the militarization of Germany, especially in a more aggressive stance in European diplomacy.

An example of this competition for a military edge can be seen in the race between Britain and Germany to have the most powerful navy.

This led to a naval arms race between Britain and Germany, starting in around 1900.

However, Britain had developed the most advanced battleship of the age, known as a ' dreadnought ’, in 1906.

The Germans were so impressed by this, that they increased their government spending so that they also had some dreadnoughts.

So, by 1914, Britain had 29 dreadnought battleships, while Germany had 17.

The final of the four causes is nationalism. Nationalism is the idea that people should have a deep love for their country, even to the extent that they are willing to die for it.

Throughout the 19th century, most countries had developed their own form of nationalism, where they encouraged a love of the nation in their citizens through the process of creating national flags and writing national anthems.

Children at schools were taught that their country was the best in the world and that should it ever be threatened, that they should be willing to take up arms to defend it.

The growing nationalist movements created strong animosity between countries that had a history of armed conflict.

A good example of this is the deep anger that existed between Germany and France.

These two countries had a recent history of war and struggle over a small region between the two, called Alsace-Lorraine.

Germany had seized control of it after the Franco-Prussian War in 1871, which the French were deeply upset by.

As a result, France believed that it should be willing to fight and die to take it back.

Conflicts and Crises

In the two decades before WWI started in 1914, there were a number of smaller conflicts and crises that had already threatened to turn into global conflicts.

While these didn't start the global war, it does show the four causes mentioned above and how they interacted in the real world.

The Moroccan Crisis

In 1904, Britain recognized France's sphere of influence over Morocco in North Africa in exchange for France recognizing Britain's sphere of influence in Egypt.

However, the Moroccans had a growing sense of nationalism and wanted their independence.

In 1905, Germany announced that they would support Morocco if they wanted to fight for their freedom.

To avoid war, a conference was held which allowed France to keep Morocco. Then, in 1911, the Germans again argued for Morocco to fight against France.

To again avoid war, Germany received territorial compensation in the French Congo as part of the 1911 Agadir Crisis in exchange for recognizing French control over Morocco.

The Bosnian Crisis

The nation of Austria-Hungary had been administrating the Turkish regions of Bosnia and Herzegovina since 1878, but they formally annexed it in 1908.

The country of Serbia was outraged, because they felt that it should have been given to them. As a result, Serbia threatened to attack Austria-Hungary.

To support them, Russia, who was allied to Serbia, prepared its armed forces. Germany, however, who was allied to Austria-Hungary, also prepared its army and threaten to attack Russia.

Luckily, war was avoided because Russia backed down. However, during the Balkan Wars of1912-1913, Serbia and its allies gained territory from the weakening Ottoman Empire.

This led to heightened tensions between Austria-Hungary and Serbia, which would contribute to the regional instability that would soon escalate into World War I.

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First World War: Causes and Effects Essay

Introduction, the causes of world war one, the effects of the war.

World War one seems like an ancient history with many cases of compelling wars to many people, but amazingly, it became known as the Great War because of influence it caused. It took place across European colonies and their surrounding seas between August 1914 and December 1918 (Tuchman, 2004). Almost sixty million troops mobilized for the war ended up in crippling situations.

For instance, more than eight million died and over thirty million people injured in the struggle. The war considerably evolved with the economic, political, cultural and social nature of Europe. Nations from the other continents also joined the war making it worse than it was.

Over a long period, most countries in Europe made joint defense treaties that would help them in battle if the need arose. This was for defense purposes. For instance, Russia linked with Serbia, Germany with Austria-Hungary, France with Russia, and Japan with Britain (Tuchman, 2004).

The war started with the declaration of war on Serbia by Austria-Hungary. This later led to the entry of countries allied to Serbia into the war so as to protect their partners.

Imperialism is another factor that led to the First World War. Many European countries found expansion of their territories enticing.

Before World War One, most European countries considered parts of Asia and Africa as their property because they were highly productive. European nations ended up in confrontations among themselves due to their desire for more wealth from Africa and Asia. This geared the whole world into war afterwards.

Competition to produce more weapons compared to other countries also contributed to the beginning of World War One. Many of the European nations established themselves well in terms of military capacity and eventually sought for war to prove their competence.

Desire for nationalism by the Serbians also played a crucial role in fueling the war. Failure to come to an agreement about Bosnia and Herzegovina led the countries to war. Both countries wanted to prove their supremacy.

Assassination of Archduke Ferdinand and his wife in Austria-Hungary sparked the war. Tuchman (2004) reveals that the Serbians assassinated Ferdinand in Sarajevo in June 1914 while protesting to the control of Sarajevo by Austria-Hungary. The assassination led to war between Serbia and Austria-Hungary. This led to mobilization of Russian troops in preparation for war.

The already prepared Germany immediately joined the war against Russia and France. On the other hand, Russians declared war on Austria and Germany. The invasion of the neutral Belgium by Germany triggered Britain to declare war against Germans.

Earlier, Britain had promised to defend Belgium against any attack. The British entered France with the intention of stopping the advancement of Germany. This intensified the enmity among the countries involved (Tuchman, 2004).

Tuchman (2004) argues that the French together with their weak allies held off the fighting in Paris and adopted trench warfare. The French had decided to defend themselves from the trenches instead of attacking. This eventually gave them the victory.

Although The British had the largest number of fleet in the world by the end of 1914, they could not end the First World War. The Germans had acquired a well-equipped fleet. This helped them advance the war to 1915. However, many countries participating in the war began to prepare for withdrawal from the conflict. The war had changed the social roles in many of the countries involved.

For instance, women in Britain performed duties initially considered masculine so as to increase their income (Tuchman, 2004). In the Western Front, the innovated gas weapons killed many people. In the Eastern Front, Bulgaria joined Austria-Hungary as the central power leading to more attacks in Serbia and Russia. Italy too joined the war and fought with the allied forces.

The British seized German ports in 1916. This led to severe shortage of food in Germany. The shortages encountered by the Germans led to food riots in many of the German towns. The Germans eventually adopted submarine warfare. With the help of this new tactic, they targeted Lusitania, one of the ships from America.

This led to the loss of many lives, including a hundred Americans, prompting America to join the war. On 1stJuly the same year, over twenty thousand people died and forty thousand injured. However, in the month of May the same year, the British managed to cripple the German fleet and eventually take control of the sea (Tuchman, 2004).

The year 1917 marked a remarkable change in Germany. Attempts to convince Mexico to invade the United States proved futile. Germany eventually lost due to lack of sufficient aid from their already worn-out allies. Towards the end of 1918, British food reserves became exhausted. This reduced the intensity of the warfare against Germans. It was in this same year that they established “Women Army Auxiliary Corps”.

It placed women on the forefront in the battlefield for the first time. On the Western Front, the Germans weakness eventually led to their defeat. The war came to an end. The British eventually emerged the superior nation among all the European nations.

The signing of the Treaty of Versailles on twenty eighth June 1919 between the Allied powers and Germany officially ended the war. Other treaties signed later contributed to the enforcement of peace among nations involved in the war (Tuchman, 2004).

First World War outlined the beginning of the modern era; it had an immense impact on the economic and political status of many countries. European countries crippled their economies while struggling to manufacture superior weapons. The Old Russian Empire replaced by a socialist system led to loss of millions of people.

The known Austro-Hungarian Empire and old Holy Roman Empire became extinct. The drawing of Middle East and Europe maps led to conflicts in the present time. The League of Nations formed later contributed significantly in solving international conflicts.

In Britain, a class system arose demarcating the lower class from the advantaged class whereas, in France the number of men significantly reduced (Tuchman, 2004). This led to sharing of the day to day tasks between men and women. First World War also caused the merger of cultures among nations. Poets and authors portray this well. Many people also ended up adopting the western culture and neglecting their own.

In conclusion, the First World War led to the loss of many lives. These included soldiers and innocent citizens of the countries at war. The First World War also led to extensive destruction of property. The infrastructure and buildings in many towns crumbled. It contributed to displacement of people from their homes. Many people eventually lost their land.

The loss of land and displacement of people has substantially contributed to the current conflicts among communities and nations. However, the First World War paved way to the establishment of organizations that ensured that peace prevailed in the world. It also led to the advancement of science and technology. It led to the realization that women too could perform masculine tasks.

Tuchman, W. B. (2004). The Guns of August : New York: Random House Publishing Group.

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• 20th Century

The 4 M-A-I-N Causes of World War One

Alex Browne

28 sep 2021.

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It’s possibly the single most pondered question in history – what caused World War One? It wasn’t, like in World War Two, a case of a single belligerent pushing others to take a military stand. It didn’t have the moral vindication of resisting a tyrant.

Rather, a delicate but toxic balance of structural forces created a dry tinder that was lit by the assassination of Archduke Franz Ferdinand in Sarajevo . That event precipitated the July Crisis, which saw the major European powers hurtle toward open conflict.

The M-A-I-N acronym – militarism, alliances, imperialism and nationalism – is often used to analyse the war, and each of these reasons are cited to be the 4 main causes of World War One. It’s simplistic but provides a useful framework.

The late nineteenth century was an era of military competition, particularly between the major European powers. The policy of building a stronger military was judged relative to neighbours, creating a culture of paranoia that heightened the search for alliances. It was fed by the cultural belief that war is good for nations.

Germany in particular looked to expand its navy. However, the ‘naval race’ was never a real contest – the British always s maintained naval superiority.  But the British obsession with naval dominance was strong. Government rhetoric exaggerated military expansionism.  A simple naivety in the potential scale and bloodshed of a European war prevented several governments from checking their aggression.

A web of alliances developed in Europe between 1870 and 1914 , effectively creating two camps bound by commitments to maintain sovereignty or intervene militarily – the Triple Entente and the Triple Alliance.

• The Triple Alliance of 1882 linked Germany, Austria-Hungary and Italy.
• The Triple Entente of 1907 linked France, Britain and Russia.

A historic point of conflict between Austria Hungary and Russia was over their incompatible Balkan interests, and France had a deep suspicion of Germany rooted in their defeat in the 1870 war.

The alliance system primarily came about because after 1870 Germany, under Bismarck, set a precedent by playing its neighbours’ imperial endeavours off one another, in order to maintain a balance of power within Europe

‘Hark! hark! the dogs do bark!’, satirical map of Europe. 1914

Image Credit: Paul K, CC BY 2.0 , via Wikimedia Commons

Imperialism

Imperial competition also pushed the countries towards adopting alliances. Colonies were units of exchange that could be bargained without significantly affecting the metro-pole. They also brought nations who would otherwise not interact into conflict and agreement. For example, the Russo-Japanese War (1905) over aspirations in China, helped bring the Triple Entente into being.

It has been suggested that Germany was motivated by imperial ambitions to invade Belgium and France. Certainly the expansion of the British and French empires, fired by the rise of industrialism and the pursuit of new markets, caused some resentment in Germany, and the pursuit of a short, aborted imperial policy in the late nineteenth century.

However the suggestion that Germany wanted to create a European empire in 1914 is not supported by the pre-war rhetoric and strategy.

Nationalism

Nationalism was also a new and powerful source of tension in Europe. It was tied to militarism, and clashed with the interests of the imperial powers in Europe. Nationalism created new areas of interest over which nations could compete.

For example, The Habsburg empire was tottering agglomeration of 11 different nationalities, with large slavic populations in Galicia and the Balkans whose nationalist aspirations ran counter to imperial cohesion. Nationalism in the Balkan’s also piqued Russia’s historic interest in the region.

Indeed, Serbian nationalism created the trigger cause of the conflict – the assassination of the heir to the Austro-Hungarian throne, Archduke Franz Ferdinand.

The spark: the assassination

Ferdinand and his wife were murdered in Sarajevo by Gavrilo Princip, a member of the Bosnian Serbian nationalist terrorist organization the ‘Black Hand Gang.’ Ferdinand’s death, which was interpreted as a product of official Serbian policy, created the July Crisis – a month of diplomatic and governmental miscalculations that saw a domino effect of war declarations initiated.

The historical dialogue on this issue is vast and distorted by substantial biases. Vague and undefined schemes of reckless expansion were imputed to the German leadership in the immediate aftermath of the war with the ‘war-guilt’ clause. The notion that Germany was bursting with newfound strength, proud of her abilities and eager to showcase them, was overplayed.

The first page of the edition of the ‘Domenica del Corriere’, an Italian paper, with a drawing by Achille Beltrame depicting Gavrilo Princip killing Archduke Franz Ferdinand of Austria in Sarajevo

Image Credit: Achille Beltrame, Public domain, via Wikimedia Commons

The almost laughable rationalization of British imperial power as ‘necessary’ or ‘civilizing’ didn’t translate to German imperialism, which was ‘aggressive’ and ‘expansionist.’ There is an on-going historical discussion on who if anyone was most culpable.

Blame has been directed at every single combatant at one point or another, and some have said that all the major governments considered a golden opportunity for increasing popularity at home.

The Schlieffen plan could be blamed for bringing Britain into the war, the scale of the war could be blamed on Russia as the first big country to mobilise, inherent rivalries between imperialism and capitalism could be blamed for polarising the combatants. AJP Taylor’s ‘timetable theory’ emphasises the delicate, highly complex plans involved in mobilization which prompted ostensibly aggressive military preparations.

Every point has some merit, but in the end what proved most devastating was the combination of an alliance network with the widespread, misguided belief that war is good for nations, and that the best way to fight a modern war was to attack. That the war was inevitable is questionable, but certainly the notion of glorious war, of war as a good for nation-building, was strong pre-1914. By the end of the war, it was dead.

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World War I

By: History.com Editors

Updated: May 10, 2024 | Original: October 29, 2009

World War I, also known as the Great War, started in 1914 after the assassination of Archduke Franz Ferdinand of Austria. His murder catapulted into a war across Europe that lasted until 1918. During the four-year conflict, Germany, Austria-Hungary, Bulgaria and the Ottoman Empire (the Central Powers) fought against Great Britain, France, Russia, Italy, Romania, Canada, Japan and the United States (the Allied Powers). Thanks to new military technologies and the horrors of trench warfare, World War I saw unprecedented levels of carnage and destruction. By the time the war was over and the Allied Powers had won, more than 16 million people—soldiers and civilians alike—were dead.

Archduke Franz Ferdinand

Tensions had been brewing throughout Europe—especially in the troubled Balkan region of southeast Europe—for years before World War I actually broke out.

A number of alliances involving European powers, the Ottoman Empire , Russia and other parties had existed for years, but political instability in the Balkans (particularly Bosnia, Serbia and Herzegovina) threatened to destroy these agreements.

The spark that ignited World War I was struck in Sarajevo, Bosnia, where Archduke Franz Ferdinand —heir to the Austro-Hungarian Empire—was shot to death along with his wife, Sophie, by the Serbian nationalist Gavrilo Princip on June 28, 1914. Princip and other nationalists were struggling to end Austro-Hungarian rule over Bosnia and Herzegovina.

The Great War

Watch The Great War . Available to stream now.

The assassination of Franz Ferdinand set off a rapidly escalating chain of events: Austria-Hungary , like many countries around the world, blamed the Serbian government for the attack and hoped to use the incident as justification for settling the question of Serbian nationalism once and for all.

Kaiser Wilhelm II

Because mighty Russia supported Serbia, Austria-Hungary waited to declare war until its leaders received assurance from German leader Kaiser Wilhelm II that Germany would support their cause. Austro-Hungarian leaders feared that a Russian intervention would involve Russia’s ally, France, and possibly Great Britain as well.

On July 5, Kaiser Wilhelm secretly pledged his support, giving Austria-Hungary a so-called carte blanche, or “blank check” assurance of Germany’s backing in the case of war. The Dual Monarchy of Austria-Hungary then sent an ultimatum to Serbia, with such harsh terms as to make it almost impossible to accept.

World War I Begins

Convinced that Austria-Hungary was readying for war, the Serbian government ordered the Serbian army to mobilize and appealed to Russia for assistance. On July 28, Austria-Hungary declared war on Serbia, and the tenuous peace between Europe’s great powers quickly collapsed.

Within a week, Russia, Belgium, France, Great Britain and Serbia had lined up against Austria-Hungary and Germany, and World War I had begun.

The Western Front

According to an aggressive military strategy known as the Schlieffen Plan (named for its mastermind, German Field Marshal Alfred von Schlieffen ), Germany began fighting World War I on two fronts, invading France through neutral Belgium in the west and confronting Russia in the east.

On August 4, 1914, German troops crossed the border into Belgium. In the first battle of World War I, the Germans assaulted the heavily fortified city of Liege , using the most powerful weapons in their arsenal—enormous siege cannons—to capture the city by August 15. The Germans left death and destruction in their wake as they advanced through Belgium toward France, shooting civilians and executing a Belgian priest they had accused of inciting civilian resistance. 

First Battle of the Marne

In the First Battle of the Marne , fought from September 6-9, 1914, French and British forces confronted the invading German army, which had by then penetrated deep into northeastern France, within 30 miles of Paris. The Allied troops checked the German advance and mounted a successful counterattack, driving the Germans back to the north of the Aisne River.

The defeat meant the end of German plans for a quick victory in France. Both sides dug into trenches , and the Western Front was the setting for a hellish war of attrition that would last more than three years.

Particularly long and costly battles in this campaign were fought at Verdun (February-December 1916) and the Battle of the Somme (July-November 1916). German and French troops suffered close to a million casualties in the Battle of Verdun alone.

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World War I Books and Art

The bloodshed on the battlefields of the Western Front, and the difficulties its soldiers had for years after the fighting had ended, inspired such works of art as “ All Quiet on the Western Front ” by Erich Maria Remarque and “ In Flanders Fields ” by Canadian doctor Lieutenant-Colonel John McCrae . In the latter poem, McCrae writes from the perspective of the fallen soldiers:

Published in 1915, the poem inspired the use of the poppy as a symbol of remembrance.

Visual artists like Otto Dix of Germany and British painters Wyndham Lewis, Paul Nash and David Bomberg used their firsthand experience as soldiers in World War I to create their art, capturing the anguish of trench warfare and exploring the themes of technology, violence and landscapes decimated by war.

The Eastern Front

On the Eastern Front of World War I, Russian forces invaded the German-held regions of East Prussia and Poland but were stopped short by German and Austrian forces at the Battle of Tannenberg in late August 1914.

Despite that victory, Russia’s assault forced Germany to move two corps from the Western Front to the Eastern, contributing to the German loss in the Battle of the Marne.

Combined with the fierce Allied resistance in France, the ability of Russia’s huge war machine to mobilize relatively quickly in the east ensured a longer, more grueling conflict instead of the quick victory Germany had hoped to win under the Schlieffen Plan .

Russian Revolution

From 1914 to 1916, Russia’s army mounted several offensives on World War I’s Eastern Front but was unable to break through German lines.

Defeat on the battlefield, combined with economic instability and the scarcity of food and other essentials, led to mounting discontent among the bulk of Russia’s population, especially the poverty-stricken workers and peasants. This increased hostility was directed toward the imperial regime of Czar Nicholas II and his unpopular German-born wife, Alexandra.

Russia’s simmering instability exploded in the Russian Revolution of 1917, spearheaded by Vladimir Lenin and the Bolsheviks , which ended czarist rule and brought a halt to Russian participation in World War I.

Russia reached an armistice with the Central Powers in early December 1917, freeing German troops to face the remaining Allies on the Western Front.

America Enters World War I

At the outbreak of fighting in 1914, the United States remained on the sidelines of World War I, adopting the policy of neutrality favored by President Woodrow Wilson while continuing to engage in commerce and shipping with European countries on both sides of the conflict.

Neutrality, however, it was increasingly difficult to maintain in the face of Germany’s unchecked submarine aggression against neutral ships, including those carrying passengers. In 1915, Germany declared the waters surrounding the British Isles to be a war zone, and German U-boats sunk several commercial and passenger vessels, including some U.S. ships.

Widespread protest over the sinking by U-boat of the British ocean liner Lusitania —traveling from New York to Liverpool, England with hundreds of American passengers onboard—in May 1915 helped turn the tide of American public opinion against Germany. In February 1917, Congress passed a $250 million arms appropriations bill intended to make the United States ready for war.

Germany sunk four more U.S. merchant ships the following month, and on April 2 Woodrow Wilson appeared before Congress and called for a declaration of war against Germany.

Gallipoli Campaign

With World War I having effectively settled into a stalemate in Europe, the Allies attempted to score a victory against the Ottoman Empire, which entered the conflict on the side of the Central Powers in late 1914.

After a failed attack on the Dardanelles (the strait linking the Sea of Marmara with the Aegean Sea), Allied forces led by Britain launched a large-scale land invasion of the Gallipoli Peninsula in April 1915. The invasion also proved a dismal failure, and in January 1916 Allied forces staged a full retreat from the shores of the peninsula after suffering 250,000 casualties.

Did you know? The young Winston Churchill, then first lord of the British Admiralty, resigned his command after the failed Gallipoli campaign in 1916, accepting a commission with an infantry battalion in France.

British-led forces also combated the Ottoman Turks in Egypt and Mesopotamia , while in northern Italy, Austrian and Italian troops faced off in a series of 12 battles along the Isonzo River, located at the border between the two nations.

Battle of the Isonzo

The First Battle of the Isonzo took place in the late spring of 1915, soon after Italy’s entrance into the war on the Allied side. In the Twelfth Battle of the Isonzo, also known as the Battle of Caporetto (October 1917), German reinforcements helped Austria-Hungary win a decisive victory.

After Caporetto, Italy’s allies jumped in to offer increased assistance. British and French—and later, American—troops arrived in the region, and the Allies began to take back the Italian Front.

World War I at Sea

In the years before World War I, the superiority of Britain’s Royal Navy was unchallenged by any other nation’s fleet, but the Imperial German Navy had made substantial strides in closing the gap between the two naval powers. Germany’s strength on the high seas was also aided by its lethal fleet of U-boat submarines.

After the Battle of Dogger Bank in January 1915, in which the British mounted a surprise attack on German ships in the North Sea, the German navy chose not to confront Britain’s mighty Royal Navy in a major battle for more than a year, preferring to rest the bulk of its naval strategy on its U-boats.

The biggest naval engagement of World War I, the Battle of Jutland (May 1916) left British naval superiority on the North Sea intact, and Germany would make no further attempts to break an Allied naval blockade for the remainder of the war.

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World War I Planes

World War I was the first major conflict to harness the power of planes. Though not as impactful as the British Royal Navy or Germany’s U-boats, the use of planes in World War I presaged their later, pivotal role in military conflicts around the globe.

At the dawn of World War I, aviation was a relatively new field; the Wright brothers took their first sustained flight just eleven years before, in 1903. Aircraft were initially used primarily for reconnaissance missions. During the First Battle of the Marne, information passed from pilots allowed the allies to exploit weak spots in the German lines, helping the Allies to push Germany out of France.

The first machine guns were successfully mounted on planes in June of 1912 in the United States, but were imperfect; if timed incorrectly, a bullet could easily destroy the propeller of the plane it came from. The Morane-Saulnier L, a French plane, provided a solution: The propeller was armored with deflector wedges that prevented bullets from hitting it. The Morane-Saulnier Type L was used by the French, the British Royal Flying Corps (part of the Army), the British Royal Navy Air Service and the Imperial Russian Air Service. The British Bristol Type 22 was another popular model used for both reconnaissance work and as a fighter plane.

Dutch inventor Anthony Fokker improved upon the French deflector system in 1915. His “interrupter” synchronized the firing of the guns with the plane’s propeller to avoid collisions. Though his most popular plane during WWI was the single-seat Fokker Eindecker, Fokker created over 40 kinds of airplanes for the Germans.

The Allies debuted the Handley-Page HP O/400, the first two-engine bomber, in 1915. As aerial technology progressed, long-range heavy bombers like Germany’s Gotha G.V. (first introduced in 1917) were used to strike cities like London. Their speed and maneuverability proved to be far deadlier than Germany’s earlier Zeppelin raids.

By the war’s end, the Allies were producing five times more aircraft than the Germans. On April 1, 1918, the British created the Royal Air Force, or RAF, the first air force to be a separate military branch independent from the navy or army. 

Second Battle of the Marne

With Germany able to build up its strength on the Western Front after the armistice with Russia, Allied troops struggled to hold off another German offensive until promised reinforcements from the United States were able to arrive.

On July 15, 1918, German troops launched what would become the last German offensive of the war, attacking French forces (joined by 85,000 American troops as well as some of the British Expeditionary Force) in the Second Battle of the Marne . The Allies successfully pushed back the German offensive and launched their own counteroffensive just three days later.

After suffering massive casualties, Germany was forced to call off a planned offensive further north, in the Flanders region stretching between France and Belgium, which was envisioned as Germany’s best hope of victory.

The Second Battle of the Marne turned the tide of war decisively towards the Allies, who were able to regain much of France and Belgium in the months that followed.

The Harlem Hellfighters and Other All-Black Regiments

By the time World War I began, there were four all-Black regiments in the U.S. military: the 24th and 25th Infantry and the 9th and 10th Cavalry. All four regiments comprised of celebrated soldiers who fought in the Spanish-American War and American-Indian Wars , and served in the American territories. But they were not deployed for overseas combat in World War I. 

Blacks serving alongside white soldiers on the front lines in Europe was inconceivable to the U.S. military. Instead, the first African American troops sent overseas served in segregated labor battalions, restricted to menial roles in the Army and Navy, and shutout of the Marines, entirely. Their duties mostly included unloading ships, transporting materials from train depots, bases and ports, digging trenches, cooking and maintenance, removing barbed wire and inoperable equipment, and burying soldiers.

Facing criticism from the Black community and civil rights organizations for its quotas and treatment of African American soldiers in the war effort, the military formed two Black combat units in 1917, the 92nd and 93rd Divisions . Trained separately and inadequately in the United States, the divisions fared differently in the war. The 92nd faced criticism for their performance in the Meuse-Argonne campaign in September 1918. The 93rd Division, however, had more success. 

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With dwindling armies, France asked America for reinforcements, and General John Pershing , commander of the American Expeditionary Forces, sent regiments in the 93 Division to over, since France had experience fighting alongside Black soldiers from their Senegalese French Colonial army. The 93 Division’s 369 regiment, nicknamed the Harlem Hellfighters , fought so gallantly, with a total of 191 days on the front lines, longer than any AEF regiment, that France awarded them the Croix de Guerre for their heroism. More than 350,000 African American soldiers would serve in World War I in various capacities.

Toward Armistice

By the fall of 1918, the Central Powers were unraveling on all fronts.

Despite the Turkish victory at Gallipoli, later defeats by invading forces and an Arab revolt that destroyed the Ottoman economy and devastated its land, and the Turks signed a treaty with the Allies in late October 1918.

Austria-Hungary, dissolving from within due to growing nationalist movements among its diverse population, reached an armistice on November 4. Facing dwindling resources on the battlefield, discontent on the homefront and the surrender of its allies, Germany was finally forced to seek an armistice on November 11, 1918, ending World War I.

Treaty of Versailles

At the Paris Peace Conference in 1919, Allied leaders stated their desire to build a post-war world that would safeguard itself against future conflicts of such a devastating scale.

Some hopeful participants had even begun calling World War I “the War to End All Wars.” But the Treaty of Versailles , signed on June 28, 1919, would not achieve that lofty goal.

Saddled with war guilt, heavy reparations and denied entrance into the League of Nations , Germany felt tricked into signing the treaty, having believed any peace would be a “peace without victory,” as put forward by President Wilson in his famous Fourteen Points speech of January 1918.

As the years passed, hatred of the Versailles treaty and its authors settled into a smoldering resentment in Germany that would, two decades later, be counted among the causes of World War II .

World War I Casualties

World War I took the lives of more than 9 million soldiers; 21 million more were wounded. Civilian casualties numbered close to 10 million. The two nations most affected were Germany and France, each of which sent some 80 percent of their male populations between the ages of 15 and 49 into battle.

The political disruption surrounding World War I also contributed to the fall of four venerable imperial dynasties: Germany, Austria-Hungary, Russia and Turkey.

Legacy of World War I

World War I brought about massive social upheaval, as millions of women entered the workforce to replace men who went to war and those who never came back. The first global war also helped to spread one of the world’s deadliest global pandemics, the Spanish flu epidemic of 1918, which killed an estimated 20 to 50 million people.

World War I has also been referred to as “the first modern war.” Many of the technologies now associated with military conflict—machine guns, tanks , aerial combat and radio communications—were introduced on a massive scale during World War I.

The severe effects that chemical weapons such as mustard gas and phosgene had on soldiers and civilians during World War I galvanized public and military attitudes against their continued use. The Geneva Convention agreements, signed in 1925, restricted the use of chemical and biological agents in warfare and remain in effect today.

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