8.2 The course of World War I

World War I reshaped the global landscape, igniting tensions that had been simmering for decades. Nationalism, imperialism, and complex alliances set the stage for a conflict that would engulf much of the world and forever alter the political order. The war's impact reached far beyond the battlefields, transforming societies, economies, and technologies while redrawing national boundaries and sowing the seeds for future global conflicts.

Origins of World War I

Nationalism in Europe

Nationalism, the intense loyalty to one's own nation and the belief in its right to self-governance, was one of the most powerful forces in pre-war Europe. Countries like Germany and Italy had only recently unified (in 1871 and 1861, respectively) and were eager to prove themselves as major powers.

In the Balkans, nationalism was especially destabilizing. Serbian nationalists wanted to unite all South Slavic peoples, which directly threatened Austria-Hungary, a multiethnic empire ruling over Serbs, Croats, Slovenes, and others. The broader movement of pan-Slavism, which sought to unite all Slavic peoples under Russian cultural leadership, added another layer of tension. Austria-Hungary saw these movements as existential threats to its survival.

Imperialism and colonial rivalries

European powers like Great Britain, France, and Germany competed fiercely for colonies and global influence. The "Scramble for Africa" in the late 19th century had already divided most of the continent among European nations, and rivalries over territory fueled mutual suspicion.

• Germany, a latecomer to the colonial game, aggressively sought to expand its overseas territories, challenging Britain and France.
• A naval arms race between Germany and Great Britain intensified after Germany began building a fleet to rival the Royal Navy. Britain viewed this as a direct threat to its global supremacy.
• Colonial disputes, such as the Moroccan Crises of 1905 and 1911, nearly brought France and Germany to war and deepened distrust among the great powers.

System of alliances

To protect their interests and maintain a balance of power, European nations locked themselves into a rigid system of alliances:

• The Triple Alliance (1882): Germany, Austria-Hungary, and Italy
• The Triple Entente (1907): Great Britain, France, and Russia

These alliances were meant to deter aggression, but they had the opposite effect. A conflict between any two nations could drag in all the others. Europe had become a "powder keg" where a single spark could set off a continental war.

Outbreak of war

Assassination of Archduke Franz Ferdinand

On June 28, 1914, Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, was assassinated in Sarajevo, Bosnia, by Gavrilo Princip, a Bosnian Serb nationalist. Princip was connected to the Black Hand, a Serbian secret military society dedicated to unifying all Serbs into one state.

Austria-Hungary blamed Serbia for the assassination and issued an ultimatum with deliberately harsh demands. Serbia accepted most of the terms but rejected those that would have compromised its sovereignty. Austria-Hungary considered this an unsatisfactory response.

July Crisis of 1914

What followed was a rapid diplomatic breakdown known as the July Crisis:

1. Austria-Hungary, backed by Germany (the so-called "blank check" of support), declared war on Serbia on July 28, 1914.
2. Russia, bound by its alliance with Serbia and its pan-Slavic commitments, began mobilizing its military.
3. Germany, viewing Russian mobilization as a threat, declared war on Russia on August 1, 1914.
4. The alliance system pulled nation after nation into the conflict within a matter of days.

Declarations of war

Germany anticipated fighting on two fronts (against France in the west and Russia in the east) and activated the Schlieffen Plan, which called for a rapid defeat of France before Russia could fully mobilize.

• August 3, 1914: Germany declared war on France and invaded neutral Belgium to bypass France's heavily fortified eastern border.
• August 4, 1914: Great Britain declared war on Germany, honoring its treaty obligation to protect Belgian neutrality.
• Within months, Japan (allied with Britain) and the Ottoman Empire (allied with Germany) entered the war, turning a European conflict into a global one.

Major battles and campaigns

Western Front vs Eastern Front

The war was fought on two main fronts:

• The Western Front stretched roughly 440 miles from the English Channel to the Swiss border. After Germany's initial advance into France was halted at the First Battle of the Marne (September 1914), both sides dug in, and the front barely moved for the next three years.
• The Eastern Front extended from the Baltic Sea to the Black Sea. Fighting here was more fluid, with larger territorial swings. Russia suffered devastating early defeats at Tannenberg and the Masurian Lakes (both in 1914), losing hundreds of thousands of soldiers.

Trench warfare and stalemate

On the Western Front, the war settled into trench warfare. Opposing armies faced each other across a narrow strip of devastated ground called "no man's land," defended by barbed wire, machine guns, and artillery.

• Soldiers endured horrific conditions: mud, rats, lice, constant shelling, and the ever-present threat of disease like trench foot.
• Neither side could break through the other's defenses. Massive offensives gained yards at the cost of tens of thousands of lives.
• This stalemate defined the Western Front from late 1914 until 1918.

Key battles (Verdun, Somme, etc.)

• Battle of Verdun (February–December 1916): The longest single battle of the war, lasting over 300 days. Germany aimed to "bleed France white" through attrition. Over 700,000 combined casualties resulted, with no significant change in the front line.
• Battle of the Somme (July–November 1916): A joint British-French offensive intended to break the stalemate. On the first day alone (July 1, 1916), the British suffered nearly 57,000 casualties. The battle ended with over 1 million total casualties and only modest territorial gains.
• Gallipoli Campaign (1915–1916): An Allied attempt to knock the Ottoman Empire out of the war by seizing the Gallipoli Peninsula and opening a sea route to Russia. It failed, costing over 250,000 Allied casualties, and became a defining moment for Australian and New Zealand national identity.
• Brusilov Offensive (June–September 1916): A major Russian offensive on the Eastern Front that initially broke through Austro-Hungarian lines and captured hundreds of thousands of prisoners. It was Russia's most successful operation of the war, though it ultimately stalled and exhausted Russian reserves.

Warfare technology and tactics

Machine guns and artillery

The industrial age transformed warfare. Machine guns like the German MG08 and the British Vickers could fire hundreds of rounds per minute, making frontal infantry assaults across open ground nearly suicidal.

Artillery dominated the battlefield. Heavy howitzers and mortars could destroy trenches and fortifications from miles away. By some estimates, artillery caused around 60% of all casualties in the war. The tactic of the creeping barrage, where a curtain of artillery fire advanced just ahead of infantry, became standard practice to provide cover during attacks.

Chemical weapons

Chemical weapons were used on a large scale for the first time in World War I:

• Chlorine gas was first deployed by Germany at the Second Battle of Ypres in April 1915, causing panic and thousands of casualties among unprepared Allied troops.
• Phosgene, more lethal and harder to detect, soon followed.
• Mustard gas, introduced in 1917, caused severe chemical burns and could contaminate an area for days.

Both sides developed and used chemical weapons despite the suffering they caused. Gas masks became standard equipment, though they offered incomplete protection. The horrors of chemical warfare led to the 1925 Geneva Protocol banning their use.

Tanks and aircraft

New technologies emerged in response to the stalemate:

• Tanks were first used by the British at the Battle of the Somme in September 1916. Early models like the Mark I were slow, mechanically unreliable, and vulnerable, but they could cross trenches and crush barbed wire. By 1917–1918, tanks played an increasingly important role, most notably at the Battle of Cambrai (November 1917).
• Aircraft began the war as reconnaissance tools but quickly evolved. Fighters engaged in aerial combat (dogfights), and bombers struck targets behind enemy lines. The development of synchronized machine guns, which could fire through a spinning propeller, made fighter planes far more deadly. Pilots like Germany's Manfred von Richthofen (the "Red Baron," with 80 confirmed kills) became famous.

Home fronts during the war

Mobilization of economies

World War I was the first total war, requiring the full mobilization of national economies. Governments took unprecedented control over production, labor, and resources:

• Rationing of food and essential goods became common in countries like Britain and Germany.
• Governments nationalized key industries and imposed price controls to ensure steady production of weapons, ammunition, and supplies.
• Germany's economy suffered especially under the British naval blockade, which cut off imports of food and raw materials, contributing to severe civilian hardship.

Role of women in the war effort

With millions of men serving at the front, women filled roles that had previously been closed to them. They worked in munitions factories, drove ambulances, served as nurses near the front lines, and took over agricultural labor.

Some women served in more direct military roles. Russia's Women's Battalion of Death, formed in 1917, saw combat on the Eastern Front. In Britain, the Women's Army Auxiliary Corps (WAAC) was established in 1917.

The war fundamentally challenged traditional gender roles. In many countries, women's contributions strengthened the case for suffrage. Britain granted some women the vote in 1918, and the United States followed with the 19th Amendment in 1920.

Propaganda and censorship

Governments on all sides used propaganda to sustain public support, encourage enlistment, and demonize the enemy. Posters, newspapers, and films portrayed the enemy as barbaric and the national cause as noble. Britain's propaganda about German atrocities in Belgium, for example, was widely circulated (and sometimes exaggerated).

Censorship was equally widespread. Governments restricted press freedom, monitored soldiers' letters, and controlled the flow of information from the front to prevent reports of heavy losses from undermining morale.

Global impact of the war

Involvement of colonies and dominions

The war was not just a European affair. Colonial subjects and dominion citizens fought and died on battlefields around the world:

• Over 1.3 million Indian soldiers served in the British forces, fighting on the Western Front, in Mesopotamia, and in East Africa.
• ANZAC (Australian and New Zealand Army Corps) troops played a major role at Gallipoli and on the Western Front.
• France recruited heavily from its African colonies. The Senegalese Tirailleurs served in some of the war's bloodiest battles.
• These contributions fueled expectations of greater political rights after the war, expectations that colonial powers largely failed to meet.

Ottoman Empire and Middle East

The Ottoman Empire, already in long decline, entered the war on the side of the Central Powers in October 1914. The consequences for the Middle East were enormous:

• The British and their allies fought the Ottomans in Mesopotamia (modern Iraq), the Sinai and Palestine, and at Gallipoli.
• The Arab Revolt (1916–1918), led by Sharif Hussein of Mecca and supported by the British (including the famous liaison officer T.E. Lawrence), aimed to overthrow Ottoman rule and create an independent Arab state.
• Meanwhile, the secret Sykes-Picot Agreement (1916) between Britain and France planned to divide Ottoman territories in the Middle East into spheres of influence, contradicting promises made to Arab leaders. This agreement shaped the modern borders of the Middle East and remains a source of resentment.

United States entry into the war

The United States initially maintained neutrality, with President Woodrow Wilson winning reelection in 1916 partly on the slogan "He kept us out of war." Several factors shifted American opinion:

• The sinking of the British passenger liner RMS Lusitania by a German U-boat in May 1915 killed 1,198 people, including 128 Americans, provoking outrage.
• The Zimmermann Telegram (January 1917), in which Germany proposed a military alliance with Mexico against the United States, was intercepted and published, inflaming American public opinion.
• Germany's resumption of unrestricted submarine warfare in early 1917 threatened American shipping and trade.

In April 1917, the United States declared war on Germany. American troops (the American Expeditionary Forces, or AEF) began arriving in large numbers by 1918, providing fresh manpower and a critical morale boost to the exhausted Allies.

Russian Revolution and withdrawal

February and October Revolutions

Russia's war effort had been catastrophic. Millions of soldiers were dead or wounded, the economy was collapsing, and food shortages plagued the home front.

• The February Revolution (March 1917 by the Western calendar) forced Tsar Nicholas II to abdicate. A provisional government took power but made the fateful decision to continue the war.
• The October Revolution (November 1917) brought the Bolsheviks, led by Vladimir Lenin, to power. They had promised "peace, land, and bread," and ending the war was their top priority.
• Opposition to Bolshevik rule sparked a civil war between the Red Army (Bolsheviks) and the White Army (a loose coalition of anti-Bolshevik forces), which lasted until 1922.

Treaty of Brest-Litovsk

In March 1918, the Bolshevik government signed the Treaty of Brest-Litovsk with Germany, ending Russia's participation in the war. The terms were punishing:

• Russia lost roughly one-third of its European territory, including Ukraine, Belarus, the Baltic states, and Finland.
• These lands contained a significant portion of Russia's population, agricultural output, and industrial capacity.

Lenin accepted these harsh terms to consolidate Bolshevik power domestically, but the treaty fueled opposition and deepened the Russian Civil War.

Impact on the war

Russia's exit had immediate military consequences. Germany transferred dozens of divisions from the Eastern to the Western Front, enabling the Spring Offensive (March–July 1918), a series of massive attacks aimed at breaking through Allied lines before American forces arrived in full strength.

The Spring Offensive made significant initial gains but ultimately failed. German forces were overextended and exhausted, and the arrival of fresh American troops tipped the balance. Beyond the battlefield, the Russian Revolution and the rise of communism inspired revolutionary movements worldwide and set the stage for the ideological conflicts of the 20th century.

End of the war

Collapse of Central Powers

By autumn 1918, the Central Powers were crumbling:

• The Austro-Hungarian Empire disintegrated as Czechs, Slovaks, South Slavs, and others declared independence. The empire's multiethnic structure, strained by years of war, simply fell apart.
• The Ottoman Empire, having lost its Middle Eastern territories and facing internal revolt, signed an armistice with the Allies on October 30, 1918.
• Germany, despite the Spring Offensive's early gains, was exhausted. The British naval blockade had caused severe food shortages, and the arrival of American troops made the military situation hopeless. Mutinies broke out in the German navy, and revolution spread through German cities. Kaiser Wilhelm II abdicated on November 9, 1918.

Armistice of November 1918

On November 11, 1918, at 11:00 a.m., Germany signed an armistice with the Allies, ending the fighting. The terms required Germany to:

• Withdraw from all occupied territories
• Surrender large quantities of military equipment (including artillery, machine guns, aircraft, and submarines)
• Release all Allied prisoners of war

The armistice ended four years of war that had killed an estimated 9–10 million soldiers and millions of civilians.

Paris Peace Conference and treaties

The Paris Peace Conference opened in January 1919, dominated by the "Big Four": Woodrow Wilson (U.S.), David Lloyd George (Britain), Georges Clemenceau (France), and Vittorio Orlando (Italy).

The Treaty of Versailles (June 1919) imposed harsh terms on Germany:

• Germany lost 13% of its territory and 10% of its population, including Alsace-Lorraine (returned to France) and parts of eastern Germany (given to the new state of Poland).
• The German military was severely restricted (army limited to 100,000 troops, no air force, no submarines).
• Germany was required to pay reparations (eventually set at 132 billion gold marks, roughly $$33 billion at the time).
• The War Guilt Clause (Article 231) forced Germany to accept full responsibility for causing the war.

Other treaties reshaped the rest of Europe: the Treaty of Saint-Germain-en-Laye dissolved Austria-Hungary, and the Treaty of Trianon stripped Hungary of two-thirds of its territory. These treaties were widely criticized for their harshness and for creating new grievances that would fuel future conflicts.

Consequences of World War I

Political and social changes

The war destroyed four empires: the German, Austro-Hungarian, Ottoman, and Russian empires all collapsed between 1917 and 1922. In their place arose republics, new nation-states, and, in Russia, the world's first communist state.

Women's wartime contributions accelerated the push for suffrage. Many countries, including Britain (1918), the United States (1920), and Germany (1919), granted women the right to vote in the years following the war.

The war also produced a generation of traumatized veterans. Millions suffered from what was then called "shell shock" (now recognized as PTSD), and widespread disillusionment with traditional values and institutions reshaped European culture.

Redrawing of national boundaries

The peace treaties fundamentally redrew the map of Europe and the Middle East:

• New nation-states emerged, including Czechoslovakia, Yugoslavia, Poland, Finland, and the Baltic states (Estonia, Latvia, Lithuania).
• President Wilson's principle of self-determination held that peoples should have the right to govern themselves, but in practice, the new borders often grouped together hostile ethnic groups or divided communities, creating tensions that persisted for decades.
• In the Middle East, former Ottoman territories were placed under League of Nations mandates controlled by Britain and France, rather than being granted independence as Arab leaders had expected.

Legacy and impact on the 20th century

World War I set the stage for much of what followed in the 20th century:

• The harsh terms of the Treaty of Versailles bred resentment in Germany, which Adolf Hitler and the Nazi Party exploited to rise to power, leading directly to World War II.
• The League of Nations, established as part of the peace settlement to prevent future wars, was fatally weakened from the start (the U.S. Senate refused to join) and ultimately failed to stop aggression in the 1930s.
• The war's economic disruption contributed to instability throughout the 1920s and helped trigger the Great Depression of the 1930s.
• The Russian Revolution inspired communist movements worldwide and laid the groundwork for the Cold War.
• Culturally, the war produced the "Lost Generation" of writers and artists, including Erich Maria Remarque (All Quiet on the Western Front) and Wilfred Owen, who captured the horror and futility of modern warfare.